1.1 规格 D3924 定义23±2°C和50±5°C的标准环境 % 油漆、清漆、油漆和相关材料的正常调节和测试所需的相对湿度和无气流。本规程描述了一个试验箱，该试验箱允许控制高于环境相对湿度的相对湿度，并将空气流量最小化，以在较高的相对湿度和室温下调节试验板。 1.2 以英寸-磅为单位的数值应视为标准值。 括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 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 有机涂层的干燥速率随温度、空气流量和相对湿度的变化而变化。特别是，水性涂料的干燥速度取决于水的蒸发，因此比溶剂型涂料或100%的涂料更依赖于相对湿度 % 固体。如果不控制干燥条件，实验室环境条件下水性涂料干燥速率的测量无法充分复制。 将描述一个试验箱，该试验箱提供了一种控制相对湿度高于环境湿度的方法，并将环境室温下气流可变性的影响降至最低。如果需要，可以将不含水且通风口全开的试验箱放置在温度和湿度控制室内，以测试不同温度和湿度下的干燥速度，同时使用试验箱将气流的影响降至最低。 5.2 本规程特别适用于测试水性路面标线（交通）涂料的干燥速率，其中在较高环境湿度下快速干燥是一个重要特征。 对于水性交通涂料，试验箱可用于评估干燥到不起皮（试验方法 D711 )和水洗阻力（实践 D7377 和 D7538 )在较高的环境湿度下。

1.1 Specification D3924 defines a standard environment of 23 ± 2°C and 50 ± 5 % relative humidity and free from drafts for normal conditioning and testing of paint, varnish, lacquer, and related materials. This practice describes a test chamber that allows for control of relative humidity above the ambient relative humidity and minimization of air flow for conditioning of test panels at elevated relative humidity and room temperatures. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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 drying rate of organic coatings varies with changes in temperature, air flow, and relative humidity. In particular, the drying rate of waterborne paints depends on the evaporation of water and thus is much more dependent on relative humidity than are solvent based paints or paints that are 100 % solids. Measurement of the rate of drying of waterborne paints under ambient conditions in laboratories cannot be adequately replicated without some control of the drying conditions. A test chamber will be described that provides a means of controlling relative humidity above ambient humidity and minimizing the effects of air flow variability at ambient room temperatures. If desired, the test chamber without water in it and with vents wide open can be placed in a temperature and humidity controlled room to test dry speed at various temperatures as well as humidity while using the chamber to minimize the effect of air flow. 5.2 This practice is particularly useful for testing the drying rate of waterborne pavement marking (traffic) paints where fast dry at elevated ambient humidity is an important feature. For waterborne traffic paints, the test chamber can be used to evaluate dry to no-pick-up (Test Method D711 ) and water wash-off resistance (Practices D7377 and D7538 ) at elevated ambient humidity.