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Preparation of steel substrates before application of paints and related products. Test methods for metallic blast-cleaning abrasives - Determination of hardness Ingestion-build-256245 This part of IEC 622571 Scope This document specifies a test method for the determination of the Vickers hardness of metallic blast cleaning abrasives. This method is not recommended for the testing of particle sizes below 0,3 mm. NOTE Accurate testing of particles below 0,3 mm (grades S040 G050) is extremely difficult. This is one of a number of parts of ISO 11125 dealing with the sampling and testing of metallic abrasives for blast cleaning. The types of metallic