The standard practice defined in the ASTM D1735 standard developed by the American Society for Testing and Materials (ASTM) covers basic principles and operating procedures for testing the water resistance of coatings in an apparatus similar to that used for salt spray testing.
This standard, whose full name is "Standard practice for testing the water resistance of coatings using the ASTM D1735-21 water fog apparatus", is limited to the methods of obtaining, measuring and controlling the conditions and procedures of water fog tests. It does not specify sample preparation, specific test conditions, or evaluation of results. Alternative applications for testing the water resistance of coatings are included in the ASTM D870, ASTM D2247 and ASTM D4585 standards.
During testing, coated samples are placed in a closed chamber to allow free settling of mist over all samples. The temperature of the chamber is usually kept at 38 degrees. The exposure condition is changed by choosing the duration of the test. Water penetrates the coating at rates that depend on the properties of the coating. Effects such as discoloration, swelling, loss of adhesion, softening or embrittlement are observed and reported.
Water can cause coatings to deteriorate, so knowing how a coating resists water is helpful in estimating its service life. Failure in water fog tests can be caused by a number of factors, including a deficiency in the coating itself, contamination of the substrate, or inadequate surface preparation. The test is therefore useful for evaluating stand-alone coatings or complete coating systems.
Water fog tests are used for research and development of coatings and substrate treatments, specification acceptance, and quality control in manufacturing. These tests usually pass or fail, but the degree of failure can also be measured. A coating system is considered successful if, after a certain period of time, there is no evidence of water-related failure.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization provides standard testing services for testing the water resistance of coatings using water mist apparatus, within the scope of ASTM D1735-21 standard, with its trained and expert staff and advanced technological equipment. gives.
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