1.1 本标准提供了一种确定底漆和面漆涂层应用的保持特性的方法。标准面漆用于确定底漆的吸收特性。釉质保持率可以测量为观察到的底漆上面漆的光泽与无孔光滑表面上相同面漆的光泽之间的差异。 1.2 本标准是在用户将评估底漆的搪瓷保持特性的背景下编写的。或者，本标准可用于评估底漆/面漆系统的搪瓷保持特性，其中底漆是恒定的，不同的面漆用作测试涂料。 1.3 本标准也可用于评估底漆以外的油漆作为第一道涂层。 在这种变更中，用户可以测试自底漆面漆的搪瓷保持特性，或使用任何其他类型的油漆作为底漆，然后使用标准面漆。 1.4 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。 1.5 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。 1.6 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====== 5.1 涂料公司和原材料供应商可使用本标准评估底漆和面漆之间的相互作用，以评估其提供良好搪瓷保持性的能力。具有最佳搪瓷保持力的底漆/面漆系统将在面漆应用的第一层中产生理想的光泽。

1.1 This standard provides a method for determining the holdout characteristics of a primer and topcoat coating application. A standard topcoat is used to determine the absorption characteristics of a primer. Enamel holdout can be measured as a difference in observed gloss of the topcoat over a primer, relative to the gloss of the same topcoat over a non-porous, smooth surface. 1.2 The standard is written in the context that the user will be evaluating the enamel holdout characteristics of a primer. Alternatively, the standard may be used as a method to evaluate the enamel holdout characteristics of primer/topcoat system where the primer is constant and different topcoats are used as test paints. 1.3 This standard may also be used for evaluation of paints other than primers as the first coat. In this alteration the user can test the enamel holdout characteristics of a self-primed topcoat, or use of any other type of paint as the primer followed by the use of a standard topcoat. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. 1.6 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 ====== 5.1 This standard may be used by paint companies and raw material suppliers to assess the interactions of primers and topcoats with respect to their ability to provide good enamel holdout. Primer/topcoat systems with the best enamel holdout will result in desirable gloss in the first coat of topcoat application.