1.1 这些试验方法包括测定塔尔油和通过分馏塔尔油获得的产品的皂化值，如术语中定义的松香、脂肪酸和蒸馏塔尔油 D804 . 这些试验方法也适用于树胶和木松香。包括以下两种测试方法: 1.1.1 使用电位滴定法的试验方法，以及 1.1.2 使用内部指示剂法的试验方法。 1.2 电位滴定法适用于浅色和深色试样。应将其视为裁判方法。内部指示剂法仅适用于浅色和中色试样。应将其视为替代方法。 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====== 3.1 这些试验方法旨在通过将塔尔油和塔尔油衍生产品作为试验材料来扩大试验方法早期版本的范围，并在试验方法中引用 D803 . 3.2 皂化值是塔尔油和塔尔油分馏所得产品的一个重要特性。 它是广泛用于测定这些产品的游离酸和结合酸总含量的试验方法。 3.3 当需要最具再现性的结果时，应使用电位测试方法。

1.1 These test methods cover the determination of the saponification number of tall oil and products obtained by the fractionation of tall oil such as rosin, fatty acids and distilled tall oil as defined in Terminology D804 . These test methods are also applicable to gum and wood rosin. Two test methods are covered as follows: 1.1.1 Test method using a potentiometric method, and 1.1.2 Test method using an internal indicator method. 1.2 The potentiometric method is suitable for use with both light- and dark-colored test samples. It should be considered the referee method. The internal indicator method is suitable for use only with light- and medium-colored test samples. It should be considered the alternate method. 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 ====== 3.1 These test methods are designed to broaden the scope of the earlier editions of the test method by the inclusion of tall oil and tall oil derived products as test materials and is referenced in Test Methods D803 . 3.2 The saponification number is an important property of tall oil and the products obtained by the fractionation of tall oil. It is the test method widely used to determine the total acid content, both free and combined, of these products. 3.3 The potentiometric test method should be used when the most reproducible results are required.