ISO 4491-3:1997 PDF

Scope: This standard describes the determination method of oxygen content (mass fraction) that can be reduced by hydrogen in metal powders of 0.05% to 3%. This method is applicable to unalloyed, partially alloyed and fully alloyed metal powders, as well as to mixtures of carbides and bonded metals. It is not suitable for powders containing lubricants or organic binders. This method can be extended to measure carbon-containing powders by using a dedicated catalytic device. ISO 4491 should be read in conjunction with ISO 760 and ISO 4491-1.

ISO 4491-3:1997 Referenced Document

ISO 4491-1:1989 Metallic powders; determination of oxygen content by reduction methods; part 1: general guidelines
ISO 760:1978 Determination of water; Karl Fischer method (General method)

1997 ISO 4491-3:1997 Metallic powders - Determination of oxygen content by reduction methods - Part 3: Hydrogen-reducible oxygen
1989 ISO 4491-3:1989 Metallic powders; determination of oxygen content by reduction methods; part 3: hydrogen-reducible oxygen