ASTM D4940 may be used when qualifying or monitoring abrasive used for blast-cleaning operations. This can be particularly relevant where abrasive quality is uncertain, where contamination may have occurred during storage or handling, or where abrasive is being reused. The inspector should identify the abrasive sample, record the test result and compare it with the applicable abrasive or project requirement. Where contamination of the prepared steel surface is also controlled, separate surface testing should be undertaken using the specified method.