1.1 本试验方法描述了一种测量两种液体（一种极性液体和另一种非极性液体）在基材、颜料（以圆盘形式）或固化或风干涂层上已知表面张力的接触角的程序，以计算固体的表面性质（表面张力及其色散和极性成分）。 1.2 使用该方法可以确定的总固体表面张力范围约为20至60 dyn/cm。 1.3 以CGS单位（dyn/cm）表示的值应视为标准值。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====== 5.1 本标准中描述的方法基于这样的概念，即表面的总自由能是不同分子间力（如色散、极性和氢键）的贡献之和。 还有其他采用三种成分（分散、极性和氢键）的技术。这些方法由于需要三到五种测试液体而更加复杂，并且不适用于常规测试。该方法使用两种液体的接触角，为计算两种组分（色散和γ）提供数据 s d ，和极性，γ s p . 5.2 色散和极性组分数据以及总固体表面张力有助于解释或预测涂层在预处理、基材和其他涂层上的润湿或粘附，或两者兼而有之。低固体表面张力值通常是污染的迹象，预示着潜在的润湿问题。高极性成分可能是极性污染的信号。 文献中有证据表明，面漆和底漆的极性成分的匹配可以提供更好的附着力。 4. 5.3 颜料的固体表面张力，特别是极性组分，可能有助于理解分散问题，或为分散剂和研磨基质的组成提供信号。然而，如果用它们制备的盘的粗糙度或孔隙率或两者存在差异，则可能很难对颜料进行比较。 5.4 虽然这项技术在表征表面、评估表面活性添加剂和解释问题方面非常有用，但它不是设计用于质量控制或规格测试。

1.1 This test method describes a procedure for the measurement of contact angles of two liquids, one polar and the other nonpolar, of known surface tension on a substrate, pigment (in the form of a disk), or cured or air dried coating in order to calculate the surface properties (surface tension and its dispersion and polar components) of the solid. 1.2 The total solid surface tension range that can be determined using this method is approximately 20 to 60 dyn/cm. 1.3 The values stated in CGS units (dyn/cm) 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 ====== 5.1 The method described in this standard is based on the concept that the total free energy at a surface is the sum of contributions from different intermolecular forces, such as dispersion, polar and hydrogen bonding. There are other techniques that employ three components (dispersion, polar and hydrogen bonding). These methods are further complicated by needing three to five test liquids and are not practical for routine testing. This method uses contact angles of two liquids to provide data for the calculation of two components, dispersion, γ s d , and polar, γ s p . 5.2 Dispersion and polar component data, along with the total solid surface tension, are useful for explaining or predicting wetting or adhesion, or both, of coatings on pretreatments, substrates and other coatings. Low solid surface tension values often are a sign of contamination and portend potential wetting problems. High polar components may signal polar contamination. There is evidence in the literature that matching of polar components of topcoats and primers gives better adhesion. 4 5.3 Solid surface tensions of pigments, particularly the polar components, may be useful in understanding dispersion problems or to provide signals for the composition of dispersants and mill bases. However, comparison of pigments may be difficult if there are differences in the roughness or porosity, or both, of the disks prepared from them. 5.4 Although this technique is very useful in characterizing surfaces, evaluating surface active additives and explaining problems, it is not designed to be a quality control or specification test.