1.1 该试验方法包括沥青染色趋势的测定以及与观察到的染色程度成比例的染色指数的分配。 1.2 本试验方法适用于环软化点和球软化点为85的沥青 摄氏度[185 °F]或更高。 注1: 可对本试验方法进行修改，以便与软化点小于85的其他沥青材料一起使用 摄氏度[185 °F]，使用不同于第节规定的温度 7. 通过利益相关方的协议。此类测试的结果报告可以引用该方法，但必须明确说明例外情况下使用的温度，并承认第节中对结果的解释 9 以及第节中规定的精度和偏差 10 可能不适用。 1.3 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值可能不是精确的等效值；因此，每个系统应独立于其他系统使用。 将两个系统的值组合在一起可能会导致不符合标准。 1.4 本标准并不旨在解决与其使用相关的安全问题（如有）。本标准的使用者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》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 4.1 该试验方法测量油组分从沥青中自发分离的趋势。油成分的分离可能会导致沥青屋顶产品和储存和使用中的相邻材料染色。 4.2 污渍指数与沥青的热稳定性有关。较高的染色指数值表示较低的稳定性和较大的染色倾向。 4.3 使用此程序来确定沥青的染色趋势，并将结果与已知染色趋势的材料进行比较。

1.1 This test method covers the determination of the staining tendency of asphalt and the assignment of a stain index proportional to the extent of staining observed. 1.2 This test method is applicable to asphalts having ring-and-ball softening points of 85 °C [185 °F] or greater. Note 1: This test method may be modified for use with other bituminous materials with softening points less than 85 °C [185 °F] by using a different temperature than specified in Section 7 by agreement of the interested parties. The report of results from such a test may cite this method but must clearly state the temperature employed in the exception and acknowledge that the interpretation of results in Section 9 and the precision and bias stated in Section 10 may not apply. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.4 This standard does not purport to address 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 measures the tendency for oil components to separate spontaneously from asphalt. The separation of oil components can cause staining in asphalt roofing products and adjacent materials in storage and use. 4.2 The stain index is related to the thermal stability of the asphalt. Higher stain index values indicate lower stability and greater tendency for staining. 4.3 Use this procedure to determine the staining tendency of asphalt and to compare the results against a material for which the staining tendency is known.