金属粉末.铁、铜、锡和青铜粉末中酸不溶物含量的测定

[中文适用范围]： 本文件规定了测定铁、铜、锡和青铜粉末中不溶于普通无机酸的非金属材料的大致含量的方法。 所指的不溶物通常被认为是酸不溶性二氧化硅和硅酸盐、碳化物、氧化铝、粘土或其他难熔氧化物，它们存在于制造粉末的原材料中或在制造过程中引入。 [外文原描述]： ISO 4496:2017 specifies methods for determining, in iron, copper, tin and bronze powders, the approximate content of non-metallic materials which are insoluble in the ordinary mineral acids. The insoluble matter referred to is generally considered to be acid-insoluble silica and silicates, carbides, alumina, clays or other refractory oxides which are either present in the raw material from which the powders are manufactured or introduced during the manufacturing process.