TECHNICAL STANDARD
ISO 12944-5
Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 5: Protective paint systems
ISO
Edition 4 / 2019
Current
WHAT DOES THIS STANDARD COVER?
Describes commonly used types of protective paint and paint systems for corrosion protection of steel structures and provides guidance relating to system selection.
WHY IS IT RELEVANT?
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.
KEY INSPECTION CONSIDERATIONS
The standard addresses types of protective paint systems. System selection should consider the environment, required durability, substrate, surface preparation, application and service conditions. A protective coating system consists of compatible layers working together rather than individual coatings considered in isolation. Inspection should verify the actual coating system, individual coats and relevant manufacturer documentation.
WHAT THE STANDARD SHOULD NOT BE USED TO ASSUME
A coating system associated with a particular environmental category should not be treated as a universal solution. Suitability can depend on surface preparation, substrate, application conditions and other project-specific factors. Manufacturer instructions remain relevant. Alternative systems may be used where their suitability has been established.
PRACTICAL INSPECTION APPLICATION
Inspectors can use the standard when reviewing the specified coating system and understanding the required coating sequence, products, number of coats, nominal thickness requirements and application limitations. Inspection should verify that the system actually installed corresponds with the project coating specification and applicable manufacturer documentation.
RELATED TECHNICAL STANDARDS
RELATED TECHNICAL TOPICS
Protective paint systems; Corrosion protection; Coating specification
RELATED PIL GUIDANCE
A pre-condition coating survey brings visual inspection, testing, sampling and access planning together to support evidence-based maintenance decisions.
A structured approach to investigating protective coating failure through evidence, testing, sampling and project-record review.
RELATED EXPERTISE
Coating Inspection; Condition Surveys; Technical Consultancy
ABOUT THIS TECHNICAL SUMMARY
Paint Inspection Ltd provides this information to help inspectors, engineers, asset owners and contractors understand the practical relevance of commonly referenced protective coatings standards. This page is PIL technical guidance and does not reproduce or replace the published standard. Users should refer to the current published standard, project specification, coating manufacturer requirements and other applicable contract documents when establishing project requirements or acceptance criteria.
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Ask the PIL Technical Assistant about this standard and related coating inspection topics.
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OFFICIAL STANDARD
PIL technical summaries are intended to explain the inspection relevance of industry standards and do not replace the published document.
STATUS AND SOURCE VERIFICATION
ISO 12944-5:2019 remains the published Edition 4. ISO/CD 12944-5 Edition 5 is under development and is intended eventually to replace ISO 12944-5:2019 and ISO 12944-9:2018. Do not publish the committee draft as current.