1.1 本试验方法 2. 涵盖铜和铁粉中矿物酸不溶物含量的测定，含量低于1.0 %. 1.2 单位- 除用于确定密度的密度值和质量值外，使用克每立方厘米（g/cm 3. )而克（g）单位是长期的行业惯例，以国际单位制表示的数值应视为标准。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 本试验方法的目的是确定脉石、耐火材料、惰性材料等材料的数量，这些材料可能会对压实工具和由铜粉和铁粉形成的部件的烧结性能产生不利影响。 4.2 不溶物由不溶于用于溶解金属的矿物酸的非金属物质组成。 在用硝酸处理的铜粉中，酸不溶物包括二氧化硅、不溶性硅酸盐、氧化铝、粘土和其他耐火材料，这些材料可能作为杂质引入原材料或从炉衬、燃料等中引入。；也可能存在硫酸铅。在用盐酸处理的铁粉中，除上述物质外，不溶物还可能包括碳化物。试验方法不包括在规定点火温度下易挥发的不溶性物质。

1.1 This test method 2 covers the determination of the mineral-acid-insoluble matter content of copper and iron powders in amounts under 1.0 %. 1.2 Units— With the exception of the values for density and the mass used to determine density, for which the use of the gram per cubic centimetre (g/cm 3 ) and gram (g) units is the longstanding industry practice, the values stated in SI units are to be regarded as standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 The purpose of this test method is to determine the amount of gangue, refractory, inert, etc. materials, that may adversely affect compacting tools and sintered properties of components formed from copper and iron powders. 4.2 The insoluble matter consists of those nonmetallic substances that do not dissolve in the mineral acid used to dissolve the metal. In copper powder, which is treated with nitric acid, the acid-insoluble matter includes silica, insoluble silicates, alumina, clays, and other refractory materials that may be introduced either as impurities in the raw material or from the furnace lining, fuel, etc.; lead sulfate may also be present. In iron powder, which is treated with hydrochloric acid, the insoluble matter may include carbides in addition to the substances listed above. The test method excludes insoluble material that is volatile at the ignition temperature specified.