1.1 本试验方法适用于任何类型（溶剂型和水性）以及任何颜色（深色和浅色）的风干建筑涂料。它不能与矿物油溶解或过度软化的薄膜一起使用，但此类薄膜的实际示例将很少出现（如果有的话）。 1.2 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。 1.3 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。 1.4 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 漆膜的孔隙率与重要的实用特性密切相关，如耐沾污性、耐磨性、耐久性以及随后应用的任何油漆的耐久性。 5.2 本试验提供了一种精确的方法来评估和比较漆膜质量，只要它与应用于无孔基材的涂层上测定的孔隙度有关。 使用本试验方法测量的孔隙度可能 不 当涂层应用于具有较高吸收特性的基材时，可以准确预测涂层孔隙度。 5.3 与当前测试方法不同 D3258页 漆膜的孔隙率仅对浅色油漆有效，本试验方法对任何颜色的油漆（包括深色和浅色）都同样有效。也不同于测试方法 D3258页 其结果不受漆膜隐藏特性的影响。

1.1 This test method is applicable to air-dry architectural coatings of any type, both solvent and water-borne, and of any color, dark as well as light. It cannot be used with films that are dissolved or excessively softened by mineral oil, but practical examples of such films will be encountered rarely, if ever. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 1.4 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 The porosity of a paint film is closely related to the important practical characteristics of stain resistance, abrasion resistance, durability, and the hold-out of any paint subsequently applied. 5.2 This test provides a precise means for evaluating and comparing the quality of paint films, insofar as it pertains to porosity as determined on a coating applied to a nonporous substrate. Porosity measured using this test method may not be an accurate predictor of coating porosity when the coating is applied to substrate of higher absorption characteristics. 5.3 Unlike current Test Method D3258 Porosity of Paint Films, which is effective only with light-colored paints, this test method is equally effective with paints of any color, both dark and light. Also unlike Test Method D3258 , its results are not influenced by the hiding characteristics of the paint film.