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See Chinese contents: GB/T 42515-2023 GB/T 42515-2023: Metallic powders -- Determination of acid-insoluble content in iron, copper, tin and bronze powders
This document describes a method for the determination of the content of non-metallic materials insoluble in common mineral acids in metallic powders of iron, copper, tin and bronze. This document applies to the determination of acid-insoluble silica and silicates, carbides, alumina, clays or other poorly soluble oxides introduced in raw materials or during the production process.
