ASTM D4585
ASTM D4585 is also known as the Standard Practice for Testing Water Resistance of Coatings Using Controlled Condensation. The ASTM D4585 test helps you determine how the coating of your product is resistant to water under condensing humid conditions. ASTM D4585 can also be used for corrosion tests especially if the samples are periodically dried. This practice describes basic principles and operating procedures to allow the testing of water resistance of coatings by employing controlled condensation so that results can be achieved consistently from lab to lab. ASTM D4585 does not specify anything about specimen preparation, specific test conditions nor does it have any guidance or requirements for the evaluation of results.
Use and factors to be considered:…show more content… In this way, it is very helpful to be aware of a coating’s ability to resist water to predict its service life. The test is useful for judging coatings alone or a complete coating system since failure in a condensation test may be provoked by various factors such as a deficiency in the coating itself, an inadequate preparation of the surface or a contamination of the substrate. Condensation tests usually result in a pass of fail determination. However, it is possible to gauge the degree of failure.
A pan of water at the bottom of the chamber is heated so that water vapor is generated. The roof or the walls of the chamber is made of the specimens with the coating facing the inside of the chamber. In this way, the reverse side of the specimen is exposed to the cooling effect of room temperature. Thus, the heat transfer induces the vapor to condense on the specimens. The amount of condensation forming on the samples depends therefore on the test temperature as well as the room
