ASTM D7539 Standard Practice for Humidity Regulation of Pavement Marking Coatings test Boards using a laboratory defines a standard environment with a temperature of 23±2°C, a relative humidity of 50± 5%, and no airflow for the normal regulation and testing of paints, 清漆, 漆, and related materials.
意义及用途

5.1 The drying rate of organic coatings varies with temperature, air flow and relative humidity. 尤其, the drying rate of water-based coatings depends on the evaporation of water and is therefore more dependent on relative humidity than solvent-based coatings or 100% solid coatings. Without some control over drying conditions, the drying rate of water-based coatings measured in the laboratory under ambient conditions cannot be adequately replicated. A test chamber providing a device for controlling relative humidity above ambient humidity and minimizing the effect of changes in airflow at ambient room temperature is described. If needed,

5.2 This practice is particularly useful for testing the drying rate of waterborne pavement marking (traffic) 涂料, where rapid drying at high ambient humidity is an important feature. For waterborne traffic coatings, test chambers can be used to assess dryness to non-absorption at high ambient humidity (test method D711) and washable resistance (practice D7377 and D7538).

ASTM D7539-2015 使用实验室对路面标记涂层测试板进行湿度调节的标准实践

步 1: 范围

1.1 Specification D3924 defines a standard environment with a temperature of 23±2°C, a relative humidity of 50± 5% and no airflow for the normal conditioning and testing of paints, 清漆, lacquers and related materials. 该实践描述了一种测试室，该测试室允许将相对湿度控制在环境相对湿度之上，并最大限度地减少气流，以在升高的相对湿度和室温下调节测试板.

1.2 以英寸到磅为单位的值应被视为标准值. 括号中给出的值是 SI 单位的数学转换，仅供参考，不被视为标准.

1.3 本标准并非旨在解决所有安全问题, 如果有的话, 与其使用相关. 本标准的使用者有责任建立适当的安全和健康实践，并在使用前确定监管限制的适用性.