主题：【已应助】ASTM D2247 - 11 Standard Practice for Testing Water Resistance of Coatings in 100% Relative Humidity

ASTM D2247 - 11 Standard Practice for Testing Water Resistance of Coatings in 100% Relative Humidity

Significance and Use

Water can cause the degradation of coatings, so knowledge of how a coating resists water is helpful for assessing how it will perform in actual service. Failure in tests at 100 % relative humidity may be caused by a number of factors including a deficiency in the coating itself, contamination of the substrate, or inadequate surface preparation. This practice is therefore useful for evaluating coatings alone or complete coating systems.

Tests at 100 % relative humidity are used for specification acceptance, quality control, and research and development for coatings and substrate treatments. Some tests are used for a pass or fail determination at an arbitrary time. A coating system is considered to pass if there is no evidence of water-related failure after a period of time. Other tests are used to monitor degree of failure as a function of exposure time.

谁有这个标准啊？急用。谢谢