TECHNICAL KNOWLEDGE
Protective Coatings Standards Library
Find standards relating to protective coating inspection, surface preparation, testing and corrosion protection — with concise practical guidance from Paint Inspection Ltd.
PIL summaries provide general technical guidance only. Always refer to the current official standard and applicable project specification.
71
standards found
CM 431
Maintenance painting of steelwork
National Highways / DMRB
Highways steelwork maintenance painting
What it covers
A National Highways document concerning the development of maintenance-painting schemes and specifications for highway steelwork.
Inspection relevance
Useful context when reviewing highway steelwork maintenance painting, condition-survey findings and coating-specification development. This record is not a statement of an approved current project requirement.
CM 431, maintenance painting, steelwork, National Highways, DMRB, highways, condition survey, coating specification
NR/L1/CIV/001
The Management of Buildings and Civils Infrastructure
Network Rail
Rail buildings and civils infrastructure framework
What it covers
A Network Rail framework document recorded as covering buildings and civils asset definitions, accountabilities and the standards framework.
Inspection relevance
Provides framework context for understanding how buildings and civils infrastructure is managed. It does not itself confirm a current coating requirement or a project-specific acceptance criterion.
NR/L1/CIV/001, Network Rail, buildings, civils infrastructure, B&C assets, asset management, accountabilities, standards framework, rail
NR/L2/CIV/039
Assessment and Certification of Protective Coatings
Network Rail
Rail protective coating certification and assessment
What it covers
A Network Rail document recorded as covering coating and sealant assessment, testing, certification, registration and specification.
Inspection relevance
Relevant as context when considering how coating-system assessment and certification may be governed within Network Rail work. It does not itself confirm a current approved coating system or project requirement.
NR/L2/CIV/039, Network Rail, protective coatings, sealants, assessment, testing, certification, registration, specification, rail
NR/L3/CIV/040
Work Instruction for the Use of Protective Coating Systems
Network Rail
Rail protective coating system selection and use
What it covers
A Network Rail work instruction recorded as covering the selection and use of protective coating systems.
Inspection relevance
Relevant as context for protective coating system selection and use on Network Rail work. It does not confirm an approved current system, product or project instruction.
NR/L3/CIV/040, Network Rail, protective coating systems, coating selection, coating use, rail infrastructure, specification
AMPP SP21511-1-2024
Laser Ablation for Surface Preparation of Ferrous Metals, Pulsed Laser
AMPP
Surface Preparation
What it covers
AMPP SP21511-1-2024 addresses the use of pulsed laser ablation as a surface-preparation method for coated or uncoated ferrous metal substrates before application of protective coatings or linings. Pulsed laser ablation can be used to remove existing coatings, oxides, contaminants and other surface materials and may be used as the primary preparation method or in conjunction with other surface-preparation methods.
Inspection relevance
This standard is highly relevant to Paint Inspection Ltd’s inspection and technical consultancy work as laser coating removal and laser surface preparation become increasingly used on infrastructure and industrial maintenance projects. It provides a recognised AMPP framework against which pulsed-laser surface-preparation operations can be considered when specified for protective coating work. Inspection should consider the specified required surface condition and whether the laser-prepared substrate is suitable for the subsequent protective coating system. Laser ablation is a surface-preparation method; compliance with a laser-ablation standard does not by itself demonstrate that every separate coating-system surface requirement has been achieved. Depending on the project, consideration may include visual cleanliness, residual coating, corrosion products, surface profile, soluble contamination, dust and debris, environmental conditions, coating manufacturer requirements and project specifications.
Related technical guidance
laser, laser cleaning, laser paint removal, laser coating removal, laser ablation, pulsed laser, pulsed laser ablation, PLA, ferrous metal, ferrous steel, surface preparation, coating removal, rust removal, oxide removal, hazardous coating removal, AMPP SP21511, SP21511, AMPP 21511, Guide 21611
SSPC-SP 2-2024
Hand Tool Cleaning
AMPP / SSPC
Surface Preparation
What it covers
Defines a degree of surface preparation achieved using hand tools to remove specified forms of loose surface contamination and deteriorated material before coating.
Inspection relevance
Particularly relevant to maintenance coating work and localised repairs where abrasive blast cleaning or power-tool preparation is not specified or practical. Do not imply that hand-tool cleaning produces the same cleanliness or surface profile as abrasive blast cleaning.
Related technical guidance
SSPC, AMPP, SP2, SP 2, hand tool cleaning, surface preparation
SSPC-SP 3-2024
Power Tool Cleaning
AMPP / SSPC
Surface Preparation
What it covers
Defines a degree of surface preparation using power-assisted tools to remove specified loose surface material before application of protective coatings.
Inspection relevance
Commonly relevant to maintenance painting, local coating repairs and areas where abrasive blast cleaning is impractical. Do not confuse SP 3 with SP 11 Power Tool Cleaning to Bare Metal.
Related technical guidance
SSPC, AMPP, SP3, SP 3, power tool cleaning, maintenance coating
SSPC-SP 7 / NACE No. 4
Brush-Off Blast Cleaning
AMPP / SSPC / NACE
Surface Preparation
What it covers
Defines the brush-off degree of abrasive blast cleaning of steel surfaces before application of protective coatings or linings.
Inspection relevance
Relevant where a relatively light abrasive blast-cleaning treatment is specified, including certain maintenance and overcoating applications. Do not confuse SP 7 for carbon steel with SP 16, which addresses brush-off blast cleaning of substrates including galvanized steel, stainless steel and non-ferrous metals.
Related technical guidance
SSPC, AMPP, NACE, SP7, NACE No 4, brush off blast, abrasive blast cleaning
SSPC-SP 10 / NACE No. 2-2024
Near-White Metal Blast Cleaning
AMPP / SSPC / NACE
Surface Preparation
What it covers
Defines the near-white degree of abrasive blast cleaning of steel surfaces before protective coating or lining application.
Inspection relevance
One of the major surface-preparation standards encountered on protective coating projects and relevant to inspection of prepared structural steel. Do not reproduce AMPP’s detailed surface-cleanliness acceptance requirements or percentages.
Related technical guidance
SSPC, AMPP, NACE, SP10, NACE No 2, near white, near-white metal, surface preparation
SSPC-SP 11-2020
Power Tool Cleaning to Bare Metal
AMPP / SSPC
Surface Preparation
What it covers
Defines a higher degree of power-tool surface preparation in which the required end condition is bare metal.
Inspection relevance
Particularly useful for local repairs, maintenance painting and restricted areas where abrasive blasting is impractical but a more rigorous degree of preparation than conventional power-tool cleaning is required. Do not confuse SP 11 with SP 3. Do not imply that every power tool automatically achieves SP 11.
Related technical guidance
SSPC, AMPP, SP11, power tool cleaning, bare metal, surface preparation
SSPC-AB 1-2019
Mineral and Slag Abrasives
AMPP / SSPC
Abrasives
What it covers
Addresses requirements relevant to mineral and slag abrasive materials used for blast cleaning steel and other surfaces.
Inspection relevance
Useful where project quality-control requirements include verification of abrasive type, properties and suitability before abrasive blast cleaning. Do not create universal PIL acceptance limits for abrasive properties.
Related technical guidance
SSPC, AMPP, mineral abrasive, slag abrasive, abrasive blast cleaning
SSPC-AB 2-2016
Cleanliness of Recycled Ferrous Metallic Abrasives
AMPP / SSPC
Abrasives
What it covers
Addresses cleanliness considerations for recycled ferrous metallic abrasive used in blast-cleaning operations.
Inspection relevance
Relevant to inspection and quality control where metallic abrasive is recovered and reused and its condition can influence surface preparation. Do not reproduce proprietary test procedures or acceptance criteria.
Related technical guidance
SSPC, AMPP, recycled abrasive, metallic abrasive, abrasive blast cleaning
SSPC-AB 3-2019
Ferrous Metallic Abrasive
AMPP / SSPC
Abrasives
What it covers
Addresses requirements applicable to ferrous metallic abrasives used for blast cleaning.
Inspection relevance
Relevant when metallic shot or grit is specified and abrasive quality forms part of surface-preparation inspection or quality control. Where appropriate, relate this to the existing ISO 11124 metallic-abrasive records.
Related technical guidance
SSPC, AMPP, metallic abrasive, ferrous metallic abrasive, steel shot, steel grit
SSPC-VIS 1-02
Guide and Reference Photographs for Steel Surfaces Prepared by Dry Abrasive Blast Cleaning
AMPP / SSPC
Visual Standards / Surface Preparation
What it covers
Provides visual reference photographs used in conjunction with applicable SSPC/AMPP surface-preparation standards when assessing dry abrasive blast-cleaned steel.
Inspection relevance
Useful to inspectors and coating personnel when visually assessing blast-cleaned steel against specified surface-preparation requirements. This PIL record does not reproduce, recreate, scan, imitate or display any copyrighted SSPC-VIS 1 reference photograph.
Related technical guidance
SSPC, AMPP, VIS 1, visual standard, surface cleanliness, abrasive blast cleaning
SSPC-VIS 3-04
Guide and Reference Photographs for Steel Surfaces Prepared by Hand and Power Tool Cleaning
AMPP / SSPC
Visual Standards / Surface Preparation
What it covers
Provides visual reference photographs for steel surfaces prepared by hand and power-tool cleaning methods.
Inspection relevance
Relevant when visually assessing surfaces prepared under hand- and power-tool cleaning standards such as SP 2, SP 3 and related preparation requirements. This PIL record does not reproduce, recreate, scan, imitate or display copyrighted SSPC-VIS 3 reference photographs.
Related technical guidance
SSPC, AMPP, VIS 3, visual standard, hand tool cleaning, power tool cleaning
SSPC-SP 1
Solvent Cleaning
AMPP / SSPC
Surface Preparation
What it covers
Defines a surface-preparation end condition addressing removal of visible oil, grease and other visible contaminants from metal surfaces before protective coating or further surface preparation.
Inspection relevance
Relevant before abrasive blasting, hand/power-tool preparation or coating application where visible oil, grease or similar contamination must first be removed. Do not imply that solvent cleaning alone removes rust, mill scale, soluble salts or produces a surface profile.
Related technical guidance
solvent cleaning, surface preparation, oil contamination, grease contamination
SSPC-SP 5 / NACE No. 1
White Metal Blast Cleaning
AMPP / SSPC / NACE
Surface Preparation
What it covers
Defines the white-metal degree of abrasive blast-cleaning of steel surfaces before application of protective coatings or linings.
Inspection relevance
Relevant where a project specification requires a very high degree of abrasive blast-cleaned steel surface cleanliness. Do not paraphrase the detailed acceptance criteria or reproduce copyrighted visual or textual requirements.
Related technical guidance
white metal blast cleaning, abrasive blast cleaning, surface preparation
SSPC-SP 6 / NACE No. 3
Commercial Blast Cleaning
AMPP / SSPC / NACE
Surface Preparation
What it covers
Defines the commercial degree of abrasive blast-cleaning of steel before application of protective coatings or linings.
Inspection relevance
Relevant where a coating specification calls for commercial blast cleaning rather than a higher or lower defined degree of surface cleanliness. Do not reproduce detailed acceptance percentages, tables or copyrighted standard wording.
Related technical guidance
commercial blast cleaning, abrasive blast cleaning, surface preparation
SSPC-SP 16
Brush-Off Blast Cleaning of Coated and Uncoated Galvanized Steel, Stainless Steels, and Non-Ferrous Metals
AMPP / SSPC
Surface Preparation
What it covers
Defines a brush-off blast-cleaning end condition for coated or uncoated metallic substrates other than carbon steel, including galvanized steel, stainless steel and certain non-ferrous metals.
Inspection relevance
Useful where abrasive preparation of these substrates is specified before coating or recoating. Do not treat SSPC-SP 16 as the carbon-steel equivalent of SSPC-SP 7.
Related technical guidance
brush-off blast cleaning, galvanized steel, stainless steel, surface preparation
SSPC-PA 2
Procedure for Determining Conformance to Dry Coating Thickness Requirements
AMPP / SSPC
Coating Inspection
What it covers
Provides a procedure for determining whether measured coating dry film thickness conforms to specified minimum and maximum thickness requirements on metallic substrates.
Inspection relevance
Highly relevant to protective-coating inspection where DFT readings must be assessed systematically against project or coating specification requirements. Do not reproduce its measurement-frequency rules, numerical acceptance rules, appendices or tables.
Related technical guidance
dry film thickness, DFT, coating inspection, thickness requirements
SSPC-PA 17
Procedure for Determining Conformance to Steel Profile/Surface Roughness/Peak Count Requirements
AMPP / SSPC
Surface Profile / Inspection
What it covers
Provides a procedure for determining whether measured steel surface profile, roughness or peak-count results conform to specified requirements.
Inspection relevance
Complements ASTM D4417 by addressing how surface-profile measurements can be evaluated for conformance with specified profile requirements.
Related technical guidance
surface profile, surface roughness, peak count, ASTM D4417, blast profile
NACE WJ-1 / SSPC-SP WJ-1
Waterjet Cleaning of Metals — Clean to Bare Substrate
AMPP / NACE / SSPC
Waterjetting / Surface Preparation
What it covers
Defines the WJ-1 degree of surface cleanliness for coated or uncoated metallic substrates prepared by waterjet cleaning before application of protective coatings or linings.
Inspection relevance
Relevant to inspection of high- and ultra-high-pressure waterjet surface preparation where a clean-to-bare-substrate end condition is specified. Do not state that waterjetting automatically produces a new surface profile comparable with abrasive blast cleaning.
Related technical guidance
waterjetting, water jetting, UHP, UHP waterjetting, high pressure waterjetting, SSPC SP12, SP 12
NACE WJ-2 / SSPC-SP WJ-2
Waterjet Cleaning of Metals — Very Thorough Cleaning
AMPP / NACE / SSPC
Waterjetting / Surface Preparation
What it covers
Defines the WJ-2 degree of surface cleanliness for coated or uncoated metallic substrates prepared by waterjet cleaning.
Inspection relevance
Relevant where very thorough waterjet cleaning is specified but a WJ-1 clean-to-bare-substrate condition is not required. Do not reproduce detailed visual acceptance requirements.
Related technical guidance
waterjetting, water jetting, UHP, UHP waterjetting, high pressure waterjetting, SSPC SP12, SP 12
NACE SP0178
Design, Fabrication, and Surface Finish Practices for Tanks and Vessels to Be Lined for Immersion Service
AMPP / NACE
Linings / Surface Preparation
What it covers
Addresses design, fabrication and surface-finish considerations for tanks and vessels that will receive protective linings for immersion service.
Inspection relevance
Relevant when inspecting fabrication and surface preparation before lining, particularly welds, edges and other fabrication details that can influence lining application and performance. Do not reproduce AMPP/NACE’s proprietary visual comparator or detailed surface-finish grades.
Related technical guidance
linings, immersion service, tanks, vessels, surface finish, fabrication
ASTM D4417
Standard Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel
ASTM International
Surface Profile
What it covers
Covers field, shop and laboratory techniques for measuring the surface profile of abrasive blast-cleaned steel.
Inspection relevance
Relevant when verifying that the profile produced by surface preparation conforms to coating-manufacturer or project specification requirements. Do not treat different surface-profile measurement methods as automatically interchangeable. ASTM D4417 itself references SSPC-PA 17 as providing additional guidance for determining conformance with surface-profile requirements.
Related technical guidance
surface profile, blast profile, replica tape, depth micrometer, blast cleaning
ASTM D4285
Standard Practice for Indicating Oil or Water in Compressed Air
ASTM International
Surface Preparation
What it covers
Provides a visual technique for determining the presence of oil or water in compressed air used for abrasive blast cleaning, air blast cleaning and coating application.
Inspection relevance
Relevant when checking that compressed air used during surface preparation and coating operations is clean and dry and is not introducing visible oil or water contamination. This is commonly known as the blotter test. Do not imply that this practice detects every possible contaminant.
Related technical guidance
compressed air, blotter test, oil contamination, water contamination, blast cleaning
ASTM D4414
Standard Practice for Measurement of Wet Film Thickness by Notch Gages
ASTM International
Coating Application & Inspection
What it covers
Covers measurement of wet film thickness using notched gauges during coating application.
Inspection relevance
WFT measurement can assist application control and can help an inspector or applicator assess whether the applied wet coating is consistent with achieving the intended dry film thickness. Do not treat WFT as a substitute for final DFT verification. The relationship between wet and dry thickness depends on the coating and relevant manufacturer/product information.
wet film thickness, WFT, notch gages, coating application
ASTM D4940
Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blast Cleaning Abrasives
ASTM International
Contamination Testing
What it covers
Provides a conductivity-based method for assessing water-soluble conductive contamination associated with blast-cleaning abrasives.
Inspection relevance
Relevant when abrasive cleanliness forms part of surface-preparation quality control, because soluble contamination carried by the abrasive can potentially be transferred to the prepared surface. Conductivity indicates overall conductive soluble contamination. The method does not identify the individual ionic species present and does not provide a quantitative result for each individual ion. Do not invent a universal acceptance limit.
Related technical guidance
conductivity, abrasive contamination, soluble contamination, blast cleaning
ASTM E337
Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
ASTM International
Environmental Conditions
What it covers
Covers determination of atmospheric humidity using wet- and dry-bulb temperature measurements with a psychrometer.
Inspection relevance
Relevant to environmental monitoring associated with coating application and surface preparation. Do not introduce a universal coating-application humidity, substrate-temperature or dew-point acceptance criterion. Project specifications and coating-manufacturer requirements govern acceptance.
relative humidity, psychrometer, wet bulb, dry bulb, coating application
ASTM D4228
Standard Practice for Qualification of Coating Applicators for Application of Coatings to Steel Surfaces
ASTM International
Coating Application & Inspection
What it covers
Provides a standard method for qualification of coating applicators to demonstrate their ability to apply specified coatings to steel surfaces using appropriate equipment and techniques.
Inspection relevance
Relevant where a project specification requires evidence of applicator proficiency or qualification before coating work proceeds. Do not imply that this standard is a universal mandatory qualification for all coating applicators or all projects.
applicator qualification, coating application, steel surfaces
ISO 12944-1
Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 1: General introduction
ISO
Protective Coating Systems
What it covers
Provides the general introduction and overall scope for the ISO 12944 series covering corrosion protection of steel structures by protective paint systems.
Inspection relevance
Useful as the starting point for understanding how the different parts of ISO 12944 work together when specifying, inspecting or assessing protective coating systems.
Related technical guidance
ISO 12944, corrosion protection, protective paint systems, coating specification
ISO 12944-2
Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 2: Classification of environments
ISO
Protective Coating Systems
What it covers
Addresses classification of the principal environments to which steel structures are exposed and the corrosivity associated with those environments.
Inspection relevance
Environmental classification is an important input when developing or reviewing protective coating specifications and considering the demands placed on a coating system. Do not imply that environment classification alone determines the correct coating system.
Related technical guidance
ISO 12944, corrosivity, environment, corrosion protection, coating specification
ISO 12944-5
Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 5: Protective paint systems
ISO
Protective Coating Systems
What it covers
Describes commonly used types of protective paint and paint systems for corrosion protection of steel structures and provides guidance relating to system selection.
Inspection relevance
Relevant when reviewing protective coating specifications and assessing whether proposed coating systems are appropriate for the intended environment, surface preparation and durability requirements. Do not present the examples within ISO 12944-5 as the only permissible coating systems.
Related technical guidance
ISO 12944, protective paint systems, corrosion protection, coating specification, maintenance
ISO 12944-8
Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 8: Development of specifications for new work and maintenance
ISO
Protective Coating Systems
What it covers
Provides guidance for developing protective coating specifications for new work and maintenance of steel structures.
Inspection relevance
Particularly relevant to PIL’s specification review and technical consultancy work, including development or review of requirements for surface preparation, coating work, inspection and maintenance.
Related technical guidance
ISO 12944, coating specification, maintenance, corrosion protection, surface preparation
ISO 12944-9
Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 9: Protective paint systems and laboratory performance test methods for offshore and related structures
ISO
Protective Coating Systems
What it covers
Addresses protective paint systems and laboratory performance testing for offshore and related structures exposed to severe marine environments.
Inspection relevance
Relevant to inspection and technical review of protective coating systems intended for severe marine and offshore exposure within the scope of the standard. Do not apply its requirements indiscriminately to every marine or industrial structure.
Related technical guidance
ISO 12944, offshore, marine, CX, Im4, protective paint systems
ISO 11124-2
Preparation of steel substrates before application of paints and related products — Specifications for metallic blast-cleaning abrasives — Part 2: Chilled-iron grit
ISO
Abrasives
What it covers
Specifies requirements for chilled-iron grit supplied as a metallic abrasive for blast-cleaning.
Inspection relevance
Relevant where chilled-iron grit is specified for abrasive blast-cleaning and abrasive characteristics form part of inspection or quality-control requirements. Requirements relate to abrasive supplied in the new condition and should not be represented as requirements for abrasive during or after use.
Related technical guidance
abrasive, blast cleaning, chilled iron grit, surface preparation
ISO 11124-3
Preparation of steel substrates before application of paints and related products — Specifications for metallic blast-cleaning abrasives — Part 3: High-carbon cast-steel shot and grit
ISO
Abrasives
What it covers
Specifies requirements for high-carbon cast-steel shot and grit supplied for blast-cleaning.
Inspection relevance
Relevant where metallic shot or grit is specified and abrasive type, grading and properties require verification as part of surface-preparation quality control. Requirements relate to abrasive supplied in the new condition.
Related technical guidance
abrasive, blast cleaning, steel shot, steel grit, surface preparation
ISO 11125-3
Preparation of steel substrates before application of paints and related products — Test methods for metallic blast-cleaning abrasives — Part 3: Determination of hardness
ISO
Abrasives
What it covers
Specifies a method for determining the Vickers hardness of metallic blast-cleaning abrasives.
Inspection relevance
Relevant where abrasive hardness needs to be assessed against project or abrasive specification requirements. Do not create an independent PIL pass/fail hardness criterion.
Related technical guidance
abrasive, abrasive hardness, blast cleaning, Vickers hardness
ISO 11126-4
Preparation of steel substrates before application of paints and related products — Specifications for non-metallic blast-cleaning abrasives — Part 4: Coal furnace slag
ISO
Abrasives
What it covers
Specifies requirements for coal furnace slag supplied as a non-metallic abrasive for blast-cleaning.
Inspection relevance
Relevant where coal furnace slag is specified and abrasive properties form part of surface-preparation inspection or quality control. Requirements relate to abrasive supplied in the new condition.
Related technical guidance
abrasive, coal furnace slag, blast cleaning, surface preparation
ISO 11126-7
Preparation of steel substrates before application of paints and related products — Specifications for non-metallic blast-cleaning abrasives — Part 7: Fused aluminium oxide
ISO
Abrasives
What it covers
Specifies requirements for fused aluminium oxide supplied as a non-metallic abrasive for blast-cleaning.
Inspection relevance
Relevant where fused aluminium oxide is specified and abrasive characteristics require verification as part of surface-preparation quality control. Requirements relate to abrasive supplied in the new condition.
Related technical guidance
abrasive, aluminium oxide, blast cleaning, surface preparation
ISO 11126-9
Preparation of steel substrates before application of paints and related products — Specifications for non-metallic blast-cleaning abrasives — Part 9: Staurolite
ISO
Abrasives
What it covers
Specifies requirements for staurolite supplied as a non-metallic abrasive for blast-cleaning.
Inspection relevance
Relevant where staurolite abrasive is specified and its properties require verification as part of surface-preparation quality control. Requirements apply to abrasive supplied in the new condition and not to abrasive during or after use.
Related technical guidance
abrasive, staurolite, blast cleaning, surface preparation
ISO 8501-4
Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 4: Initial surface conditions, preparation grades and flash rust grades in connection with water jetting
ISO
Surface Preparation
What it covers
Provides visual preparation grades and flash-rust grades associated with water-jetting of steel surfaces before coating.
Inspection relevance
Relevant when inspecting steel prepared by water jetting. Visual cleanliness should not be treated as confirmation that invisible contamination or surface-profile requirements have also been satisfied.
ISO 8501-4; water jetting; flash rust; surface preparation; surface cleanliness
ISO 8502-3
Preparation of steel substrates before application of paints and related products — Tests for the assessment of surface cleanliness — Part 3: Assessment of dust on steel surfaces prepared for painting (pressure-sensitive tape method)
ISO
Surface Cleanliness
What it covers
Describes assessment of dust remaining on cleaned steel surfaces using pressure-sensitive tape, including assessment of dust quantity and particle size.
Inspection relevance
Used during surface-preparation inspection to identify residual dust before coating. Project specifications should define required acceptance criteria.
ISO 8502-3; dust; pressure-sensitive tape; surface cleanliness; surface preparation
ISO 8502-4
Preparation of steel substrates before application of paints and related products — Tests for the assessment of surface cleanliness — Part 4: Guidance on the estimation of the probability of condensation prior to paint application
ISO
Environmental Conditions
What it covers
Provides guidance for estimating the probability of condensation on a surface before paint application.
Inspection relevance
Relevant to monitoring substrate temperature, air temperature, relative humidity and dew-point conditions before and during coating work. Project specifications and coating-manufacturer requirements govern acceptance.
ISO 8502-4; condensation; dew point; relative humidity; environmental conditions
ISO 8503-4
Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 4: Method for the calibration of ISO surface profile comparators and for the determination of surface profile — Stylus instrument procedure
ISO
Surface Profile
What it covers
Covers use of a stylus instrument for calibration of ISO surface-profile comparators and determination of blast-cleaned steel surface profile.
Inspection relevance
Relevant where an inspector uses instrument-based profile measurement rather than, or alongside, comparator or replica-tape methods. Do not confuse measured profile with ISO 19840 correction values.
Related technical guidance
ISO 8503-4; surface profile; blast profile; stylus; comparator; replica tape
ISO 8504-2
Preparation of steel substrates before application of paints and related products — Surface preparation methods — Part 2: Abrasive blast-cleaning
ISO
Surface Preparation
What it covers
Covers abrasive blast-cleaning methods used to prepare steel surfaces before application of paints and related products.
Inspection relevance
Relevant to inspection of abrasive blast-cleaning operations, including understanding the preparation method and its field of application.
Related technical guidance
ISO 8504-2; abrasive blast-cleaning; surface preparation; blasting
ISO 8504-3
Preparation of steel substrates before application of paints and related products — Surface preparation methods — Part 3: Hand- and power-tool cleaning
ISO
Surface Preparation
What it covers
Addresses preparation of steel surfaces using hand- and power-tool cleaning methods before coating.
Inspection relevance
Relevant to maintenance painting and areas where abrasive blast-cleaning is impractical or not specified. Do not equate hand/power-tool preparation with abrasive blast-cleaning preparation grades.
ISO 8504-3; hand-tool cleaning; power-tool cleaning; maintenance painting; surface preparation
ISO 4624
Paints and varnishes — Pull-off test for adhesion
ISO
Adhesion Testing
What it covers
Specifies pull-off test methods used to assess adhesion behaviour of single coatings or multi-coat paint systems.
Inspection relevance
Relevant where quantitative pull-off testing forms part of coating inspection, condition assessment or failure investigation. Record failure mode and test conditions where relevant. ISO 4624 and ASTM D4541 are not identical procedures.
Related technical guidance
ISO 4624; pull-off; adhesion; coating failure; testing
ISO 2409
Paints and varnishes — Cross-cut test
ISO
Adhesion Testing
What it covers
Specifies a cross-cut method for assessing the resistance of a coating to separation when a lattice pattern is cut through the coating.
Inspection relevance
Useful for comparative assessment of coating behaviour in appropriate coating/substrate configurations. This procedure is not a means of measuring adhesion; do not express results as tensile strength or convert classifications into MPa or psi.
Related technical guidance
ISO 2409; cross-cut; adhesion; coating testing
ISO 4628-6
Paints and varnishes — Evaluation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 6: Assessment of degree of chalking by tape method
ISO
Condition Assessment
What it covers
Provides a method and pictorial references for assessing the degree of chalking of paint coatings using a tape method.
Inspection relevance
Relevant during coating condition surveys and failure investigations when degradation includes chalking. Care is required to distinguish actual coating degradation products from surface dirt or other contamination.
ISO 4628-6; chalking; condition assessment; coating degradation; tape method
ISO 11126-10
Preparation of steel substrates before application of paints and related products — Specifications for non-metallic blast-cleaning abrasives — Part 10: Almandite garnet
ISO
Abrasives
What it covers
Specifies requirements for almandite garnet supplied as a non-metallic blast-cleaning abrasive.
Inspection relevance
Relevant to abrasive selection and verification where garnet is specified for surface preparation. The requirements apply to abrasive supplied in the new condition and should not be represented as requirements for abrasive during or after use.
ISO 11126-10; garnet; almandite garnet; abrasive; blast-cleaning
ISO 11127-2
Preparation of steel substrates before application of paints and related products — Test methods for non-metallic blast-cleaning abrasives — Part 2: Determination of particle size distribution
ISO
Abrasives
What it covers
Specifies determination of particle-size distribution of non-metallic blast-cleaning abrasives by sieving.
Inspection relevance
Relevant when checking abrasive characteristics against specification requirements as part of surface-preparation quality control.
ISO 11127-2; abrasive; particle size distribution; sieving; blast-cleaning
ISO 8504-1
Preparation of steel substrates before application of paints and related products — Surface preparation methods — Part 1: General principles
ISO
Surface Preparation
What it covers
ISO 8504-1 provides general principles for selecting methods for preparation of steel surfaces before application of paints and related products. It forms part of the ISO 8504 series dealing with surface-preparation methods and provides a framework for considering the condition of the steel, the required prepared surface and the preparation method to be used.
Inspection relevance
Surface preparation is fundamental to protective coating performance. ISO 8504-1 is relevant when considering how an existing steel surface should be prepared before coating and reinforces the principle that the selected preparation method needs to be appropriate for the required surface condition and subsequent coating system. This is particularly relevant when alternative preparation technologies such as laser cleaning are proposed in place of methods originally specified for a project. The preparation method should not be accepted simply because it removes the existing coating; the resulting surface still needs to satisfy the applicable coating and project requirements.
Related technical guidance
ISO 8504-1, ISO 8504, surface preparation, steel preparation, preparation methods, protective coatings, paint preparation, coating inspection, laser cleaning, abrasive blasting, steel substrates
ISO 8501-1
Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings
ISO
Surface Preparation
What it covers
ISO 8501-1 provides recognised rust grades and visual preparation grades for steel surfaces before application of paints and related products. It includes preparation grades associated with abrasive blast-cleaning and other specified preparation methods and provides internationally recognised visual references for assessment of prepared steel.
Inspection relevance
ISO 8501-1 is widely relevant to protective coating inspection because the visual condition of prepared steel is an important part of determining whether the surface is ready for coating. The required preparation grade should be established by the project specification and coating requirements. Visual assessment should also be distinguished from other surface characteristics such as soluble salt contamination and surface profile, which require separate consideration where applicable. For laser cleaning specifically, the familiar Sa preparation grades should not automatically be assigned to a laser-cleaned surface simply because its appearance resembles blast-cleaned steel.
Related technical guidance
ISO 8501-1, ISO 8501, surface cleanliness, visual cleanliness, rust grades, preparation grades, Sa 2, Sa 2½, Sa 3, blast cleaning, abrasive blasting, steel preparation, surface preparation, protective coatings, paint inspection
ISO 12944-7
Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 7: Execution and supervision of paint work
ISO
Coating Application & Inspection
What it covers
ISO 12944-7:2017 addresses the execution and supervision of protective paint work on steel structures, whether undertaken in the workshop or on site. It forms part of the wider ISO 12944 series covering corrosion protection of steel structures by protective paint systems. The standard is relevant to the control and supervision of coating application but does not itself cover all aspects of surface preparation, coating-system selection or passive fire-protection design.
Inspection relevance
ISO 12944-7 is relevant to independent coating inspection because effective quality control extends beyond final dry film thickness measurements. Inspection and supervision during coating work can include verification of materials, environmental conditions, application activities, workmanship, coating build, defects, repairs and relevant project documentation. For Paint Inspection Ltd, the standard provides an important reference within the wider framework used when supervising protective coating application on steel structures. When intumescent coatings are involved, ISO 12944-7 should not be presented as the product’s fire-performance assessment or as an intumescent-specific design standard.
Related technical guidance
ISO 12944-7, ISO 12944, execution of paint work, supervision of paint work, coating application, coating inspection, paint inspection, protective coatings, steel structures, corrosion protection, coating supervision, quality control, workshop coating, site coating
EAD 350402-00-1106
Reactive coatings for fire protection of steel elements
EOTA — European Organisation for Technical Assessment
Fire Protection
What it covers
EAD 350402-00-1106 is a European Assessment Document covering reactive coatings intended for the fire protection of steel elements. It provides an assessment basis for reactive fire-protection coating products and kits used on steel. Depending on the assessed product or kit, the system can include the reactive coating together with specified primers, topcoats and/or reinforcement. The EAD is used as the assessment basis for European Technical Assessments for applicable reactive coating products.
Inspection relevance
For intumescent coating inspection, EAD 350402-00-1106 helps establish the importance of considering the approved coating system as a whole, rather than viewing the reactive layer in isolation. The applicable European Technical Assessment and manufacturer documentation for the specific product can define relevant system components, intended use and assessed configurations. Inspection should therefore verify the installed coating work against the documentation applicable to the specific project and product. The EAD should not be presented as a universal site installation specification or as providing one universal DFT for a given fire-resistance period.
Related technical guidance
EAD 350402-00-1106, reactive coating, reactive coatings, intumescent coating, intumescent paint, passive fire protection, PFP, steel fire protection, fire protection coating, ETA, European Technical Assessment, EOTA, fire protected steel, intumescent inspection
ISO 4628-1
Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 1: General introduction and designation system
ISO
Condition Assessment
What it covers
ISO 4628-1 establishes the general system used within the ISO 4628 series for designating the quantity and size of coating defects and the intensity of changes in coating appearance. It provides the framework used by the other parts of the series for more specific forms of deterioration.
Inspection relevance
Provides coating inspectors with a recognised framework for recording and communicating coating deterioration consistently during condition surveys and failure investigations. It supports structured assessment rather than relying solely on subjective descriptions such as minor, moderate or severe.
Related technical guidance
ISO 4628, ISO 4628-1, coating condition, coating degradation, paint defects, condition survey, coating defects, protective coatings, defect assessment, coating inspection
ISO 4628-2
Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 2: Assessment of degree of blistering
ISO
Condition Assessment
What it covers
ISO 4628-2 specifies a method for assessing the degree of blistering of coatings using pictorial standards and the designation principles of the ISO 4628 series.
Inspection relevance
Provides a recognised method for consistently recording blistering during coating condition surveys and failure investigations. The classification describes the observed defect; it should not by itself be treated as establishing the cause of blistering.
Related technical guidance
ISO 4628-2, blistering, coating blistering, paint blisters, coating defects, coating condition survey, failure investigation, protective coatings
ISO 4628-3
Paints and varnishes — Evaluation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 3: Assessment of degree of rusting
ISO
Condition Assessment
What it covers
ISO 4628-3 provides a method for assessing the degree of rusting present on coated surfaces using recognised reference criteria.
Inspection relevance
Particularly relevant to protective coating condition surveys of steel infrastructure where the distribution and extent of visible corrosion needs to be recorded consistently. Rusting assessment can support corrosion mapping and maintenance planning, but the rating alone does not determine substrate loss, structural condition or root cause.
Related technical guidance
ISO 4628-3, ISO 4628-3:2024, rusting, corrosion, degree of rusting, coating breakdown, corrosion mapping, steel coatings, coating survey, protective coatings
ISO 4628-4
Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 4: Assessment of degree of cracking
ISO
Condition Assessment
What it covers
ISO 4628-4 specifies a method for assessing the degree of cracking of coatings by comparison with recognised pictorial standards.
Inspection relevance
Provides a consistent method for recording coating cracking during condition assessment and failure investigation. The resulting classification describes the observed deterioration but does not, by itself, establish why the coating has cracked.
Related technical guidance
ISO 4628-4, cracking, coating cracking, paint cracking, coating defects, coating deterioration, condition survey, failure investigation, protective coatings
ISO 4628-5
Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 5: Assessment of degree of flaking
ISO
Condition Assessment
What it covers
ISO 4628-5 specifies a method for assessing the degree of flaking of coatings using the designation system and reference approach of the ISO 4628 series.
Inspection relevance
Provides a recognised method for recording coating flaking during condition surveys and failure investigations. Flaking can provide important evidence about deterioration and coating integrity, but the observed classification should not automatically be interpreted as identifying the underlying cause.
Related technical guidance
ISO 4628-5, flaking, coating flaking, paint flaking, delamination, coating defects, coating deterioration, condition survey, failure investigation, protective coatings
ASTM E1252
Standard Practice for General Techniques for Obtaining Infrared Spectra for Qualitative Analysis
ASTM International
Testing & Analysis
What it covers
ASTM E1252 provides general practices for obtaining infrared spectra for qualitative analysis. In protective coating investigations, infrared spectroscopy — including FTIR — can provide analytical information that assists with characterising coating materials and identifying generic chemical or binder characteristics when interpreted by a competent laboratory. The practice provides a general analytical framework rather than a coating-specific condition assessment or maintenance specification.
Inspection relevance
FTIR analysis can form part of an investigation into existing protective coating systems where coating history or generic binder chemistry is uncertain. This can be particularly useful during coating condition surveys, maintenance planning and failure investigations. Laboratory findings should be considered alongside field evidence such as coating condition, layer structure, dry film thickness, adhesion, corrosion, defects and maintenance history. FTIR analysis alone should not be interpreted as proving coating compatibility, identifying an exact commercial product or determining remaining coating service life.
Related technical guidance
ASTM E1252, ASTM E1252-98, ASTM E1252-98(2021), FTIR, Fourier Transform Infrared Spectroscopy, infrared spectroscopy, infrared spectra, qualitative analysis, coating analysis, paint analysis, binder identification, coating identification, laboratory analysis, protective coatings
ASTM D4752
Standard Practice for Measuring MEK Resistance of Ethyl Silicate (Inorganic) Zinc-Rich Primers by Solvent Rub
ASTM International
Testing & Analysis
What it covers
ASTM D4752 provides a practice for assessing the methyl ethyl ketone (MEK) resistance of ethyl silicate inorganic zinc-rich primers using a solvent-rub technique. For applicable inorganic zinc-rich primers, MEK resistance can provide an indication of the degree of cure and can be used as part of inspection before subsequent coating operations where required by the project specification or coating manufacturer’s requirements. The practice should not be described as an adhesion test and does not directly measure coating adhesion strength.
Inspection relevance
Ethyl silicate inorganic zinc-rich primers may require verification that an appropriate degree of cure has been achieved before overcoating. ASTM D4752 provides inspectors with a recognised method of assessing MEK resistance for these applicable coatings. The required resistance or cure criterion for proceeding with a particular coating system should be established from the relevant project specification, coating manufacturer’s documentation and agreed inspection requirements. The standard should not be interpreted as providing one universal pass/fail value suitable for every zinc silicate coating system.
Related technical guidance
ASTM D4752, ASTM D4752-20, ASTM D4752-20(2024), MEK test, MEK resistance, methyl ethyl ketone, solvent rub, zinc silicate, inorganic zinc, inorganic zinc rich primer, ethyl silicate, zinc primer, coating cure, cure testing, overcoating, coating inspection
ISO 8503-5
Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 5: Replica tape method for the determination of the surface profile
ISO
Surface Preparation
What it covers
ISO 8503-5 specifies a field method for determining the surface profile of abrasive blast-cleaned steel using replica tape and a suitable measuring gauge before the application of paint or other protective coatings. The method provides a practical means of obtaining a numerical assessment of blast profile and is widely applicable to protective coating inspection where verification of surface preparation is required.
Inspection relevance
Surface profile is an important characteristic of abrasive blast-cleaned steel because the profile produced must be appropriate for the protective coating system being applied. Replica tape enables inspectors to obtain and record a representation of the blast profile at selected locations before the surface is coated. The measurement should be interpreted in accordance with the applicable standard, project specification and coating system requirements. A higher surface profile should not automatically be considered better.
Related technical guidance
ISO 8503-5, ISO 8503 Part 5, surface profile, blast profile, replica tape, Testex tape, abrasive blasting, abrasive blast cleaning, steel surface preparation, surface roughness, peak to valley, coating inspection
ISO 19840
Measurement of, and acceptance criteria for, the thickness of dry films on rough surfaces
ISO
DFT / Coating Thickness
What it covers
Provides a procedure for measuring and assessing dry film thickness of protective coating systems on rough steel surfaces, including the treatment of surface roughness when comparing measurements with nominal dry film thickness.
Inspection relevance
Frequently relevant when verifying coating thickness on abrasive blast-cleaned structural steel. Inspectors need to understand the measurement procedure, instrument adjustment and treatment of surface roughness before interpreting DFT results.
Related technical guidance
ISO 19840 Measurement of, and acceptance criteria for, the thickness of dry films on rough surfaces ISO DFT / Coating Thickness Dry Film Thickness Surface Profile Protective Coating Inspection Abrasive Blast Cleaning Quality Assurance
ISO 8502-6
Preparation of steel substrates before application of paints and related products — Tests for the assessment of surface cleanliness — Part 6: Extraction of water-soluble contaminants for analysis (Bresle method)
ISO
Contamination Testing
What it covers
Describes the extraction of water-soluble contaminants from a surface for subsequent analysis using the Bresle method.
Inspection relevance
Used as part of field assessment of soluble surface contamination before protective coating application.
Related technical guidance
ISO 8502-6 Preparation of steel substrates before application of paints and related products — Tests for the assessment of surface cleanliness — Part 6: Extraction of water-soluble contaminants for analysis (Bresle method) ISO Contamination Testing Soluble Salt Testing Surface Preparation Contamination Testing
ISO 8502-9
Preparation of steel substrates before application of paints and related products — Tests for the assessment of surface cleanliness — Part 9: Field method for the conductometric determination of water-soluble salts
ISO
Contamination Testing
What it covers
Describes a field method for the conductometric determination of water-soluble salts on steel surfaces.
Inspection relevance
Commonly used alongside surface extraction procedures when assessing ionic contamination before coating application.
Related technical guidance
ISO 8502-9 Preparation of steel substrates before application of paints and related products — Tests for the assessment of surface cleanliness — Part 9: Field method for the conductometric determination of water-soluble salts ISO Contamination Testing Soluble Salt Testing Surface Preparation Contamination Testing
ISO 8503-1
Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 1: Specifications and definitions for ISO surface profile comparators
ISO
Surface Profile
What it covers
Defines ISO surface profile comparators used for assessing the profile of abrasive blast-cleaned steel surfaces.
Inspection relevance
Relevant when classifying blast-cleaned steel surface profile and when surface-profile grade is used as part of coating inspection and DFT assessment.
Related technical guidance
ISO 8503-1 Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 1: Specifications and definitions for ISO surface profile comparators ISO Surface Profile Surface Profile Abrasive Blast Cleaning Dry Film Thickness
ISO 8503-2
Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 2: Method for the grading of surface profile of abrasive blast-cleaned steel — Comparator procedure
ISO
Surface Profile
What it covers
Describes a visual and tactile procedure for grading the surface profile of abrasive blast-cleaned steel using ISO comparators.
Inspection relevance
Provides a practical field method for determining whether a prepared steel surface corresponds to a defined ISO profile grade.
Related technical guidance
ISO 8503-2 Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 2: Method for the grading of surface profile of abrasive blast-cleaned steel — Comparator procedure ISO Surface Profile Surface Profile Abrasive Blast Cleaning Dry Film Thickness
ASTM D4541-22
Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers
ASTM International
Adhesion Testing
What it covers
Provides a method for determining the pull-off strength of coatings using portable adhesion testers.
Inspection relevance
Used where quantitative assessment of coating pull-off strength is required. Interpretation should consider both the measured result and the observed failure mode.
Related technical guidance
ASTM D4541-22 Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers ASTM International Adhesion Testing Adhesion Testing Protective Coating Inspection Coating Failure Investigation
ASTM D3359-23
Standard Test Methods for Rating Adhesion by Tape Test
ASTM International
Adhesion Testing
What it covers
Provides tape-test methods for rating adhesion of coating films to metallic substrates using cuts made through the coating.
Inspection relevance
Commonly encountered for adhesion assessment of coating films, but method selection needs to consider coating thickness, coating characteristics and the purpose of the test.
Related technical guidance
ASTM D3359-23 Standard Test Methods for Rating Adhesion by Tape Test ASTM International Adhesion Testing Adhesion Testing Protective Coating Inspection Coating Failure Investigation