The ASTM D1735 standard specifies a procedure for testing coating water resistance using a water mist device. This test evaluates the water resistance of coatings by simulating a water mist environment under high Humidity conditions. Unlike ASTM B117's salt spray testing, this standard uses softening water that does not contain sodium chloride and is suitable for simulating milder humid conditions. During the test, water mist is deposited on the specimen surface at a specified temperature to observe phenomena such as coating Color change, blistering or flaking. This test helps to predict the performance and life of coatings in actual use.
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