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This International Standard specifies the method for the determination of the total oxygen content of metallic powders by reduction-extraction of the sample at high temperature. The text of ISO 4491-4 has been prepared by Technical Committee ISO/TC 119 "Powder metallurgy" (secretariat: SIS, Sweden). The responsible German Committee is Working Committee NA 145-01-02 AA "Probenahme und Prüfverfahren für Pulver (einschließlich Pulver für Hartmetalle)" ("Sampling and testing methods for powders (including powders for hardmetals)") of the Technology of Materials Standards Committee (NWT) at DIN.
This document replaces DIN ISO 4491-4:1990-06 .
This document has been replaced by: DIN EN ISO 4491-4:2019-09 .