1.1 本试验方法包括通过对湿膜和干膜的目视评估，测定建筑涂料在干燥过程中遮盖力的变化。 1.2 除白色和色调外，不建议使用本试验方法。 1.3 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 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和健康实践，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====== 5.1 许多建筑涂料，尤其是白色和浅色涂料，在干燥时膜的不透明度会发生显著变化。隐蔽性的增加有时与传统配方涂层的孔隙率和较差的膜完整性有关。减少可能会导致令人失望的喷漆工作。因此，从湿到干的隐藏变化是一个具有重大实际意义的特性。 5.2 该测试方法可用于涂料规范，并作为评估和质量控制的简短程序。

1.1 This test method covers the determination of the change in hiding power of an architectural coating during drying, by visual evaluation of the wet and dry film. 1.2 This test method is not recommended for colors other than white and tints. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 and health 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 ====== 5.1 Many architectural paints, particularly white and light tints, change significantly in film opacity as they dry. An increase in hiding is sometimes associated with porosity and poor film integrity with conventionally formulated coatings. A decrease can result in a disappointing paint job. The wet-to-dry hiding change is therefore a property of great practical importance. 5.2 This test method can be used in paint specifications and as a short, simple procedure for evaluation and quality control.