1.1 本规程描述了一种溶剂摩擦技术，用于评估在固化过程中发生化学变化的有机涂层的耐溶剂性。这种技术可以在实验室、现场或制造车间中使用。试验方法 D4752 是硅酸乙酯富锌底漆的优选方法。 1.2 本规程未规定溶剂、双摩擦次数或预期测试结果。 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 本标准并不旨在解决与其使用相关的所有安全问题（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。 有关所用溶剂的具体危险信息，请参阅供应商的安全数据表。 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 在固化过程中发生化学变化的涂层，如环氧树脂、乙烯基酯、聚酯、醇酸树脂和氨基甲酸乙酯，在固化时对溶剂的抵抗力更强。这些涂层在涂面漆之前和投入使用之前应达到特定的耐溶剂性水平；所需的耐溶剂性水平随涂层类型和预期用途而变化。用浸透适当溶剂的布擦拭是确定何时达到特定耐溶剂水平的一种方法。 然而，耐溶剂性本身并不意味着完全固化，一些涂层在充分固化以供使用之前就具有耐溶剂性。 4.2 达到特定耐溶剂性水平所需的时间可能受到温度、膜厚度、空气运动的影响，对于水性或水反应性涂层，还可能受到湿度的影响。 4.3 试验溶剂对涂层的影响因涂层类型和使用的溶剂而异。涂料制造商可以指定溶剂、双摩擦次数和所需的具体测试结果。

1.1 This practice describes a solvent rub technique for assessing the solvent resistance of an organic coating that chemically changes during the curing process. This technique can be used in the laboratory, in the field, or in the fabricating shop. Test Method D4752 is the preferred method for ethyl silicate zinc-rich primers. 1.2 This practice does not specify the solvent, number of double rubs, or expected test results. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Consult the supplier’s Safety Data Sheet for specific hazard information relating to the solvent used. 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 Coatings that chemically change during the curing process, such as epoxies, vinyl esters, polyesters, alkyds and urethanes, become more resistant to solvents as they cure. These coatings should reach specific levels of solvent resistance prior to being topcoated and prior to placing in service; the levels of solvent resistance necessary vary with the type of coating and the intended service. Rubbing with a cloth saturated with the appropriate solvent is one way to determine when a specific level of solvent resistance is reached. However, the level of solvent resistance by itself does not indicate full cure and some coatings become solvent resistant before they become sufficiently cured for service. 4.2 The time required to reach a specific level of solvent resistance can be influenced by temperature, film thickness, air movement and, for water-borne or water-reactive coatings, humidity. 4.3 The test solvent’s effect upon the coating varies with coating type and solvent used. The coating manufacturer may specify the solvent, the number of double rubs, and the specific test results needed.