1.1 本试验方法包括测定马来酸酐（MAH）接枝蜡的酸值。该数值通过直接滴定材料获得，并指示存在的游离酸量。 1.2 本试验方法适用于MAH接枝蜡，因为它使用特殊的样品制备步骤( 7.1 )其他蜡不需要。特殊样品制备逆转了蜡储存期间可能发生的酸酐水解。 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 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。 1.5 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 本试验方法用于测定马来酸酐接枝蜡的游离酸含量。这种蜡在储存过程中的酸酐功能性可能发生水解，因此不适合通过试验方法测定游离酸含量 D1386 . 游离酸含量是一项重要的质量控制测试，是蜡效用的决定因素。

1.1 This test method covers the determination of the acid number of maleic anhydride (MAH) grafted waxes. The number is obtained by direct titration of the material and indicates the amount of free acid present. 1.2 This test method is applicable to MAH-grafted waxes because it uses a special sample preparation step ( 7.1 ) that is not required for other waxes. The special sample preparation reverses the hydrolysis of acid anhydride that can occur during storage of the wax. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. 1.5 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 This test method is used to determine the free acid content of MAH-grafted waxes. The potential hydrolysis of the anhydride functionality of this wax in storage makes them unsuitable for determining free acid content by Test Method D1386 . Free acid content is a significant quality control test, and is a determinant of the utility of the wax.