Testing Water Resistance of Coatings as per ASTM D2247
In a closed cabinet with heated, saturated air and water vapor, test specimens are placed. The chamber is kept at a constant temperature of 38°C (100°F). Condensation forms on the specimens when the relative humidity (RH) is 100% and there is only a very slight temperature differential between the specimen and the surrounding vapor. By adjusting the test’s duration, the exposure condition is changed. Depending on the coating’s properties, water penetrates the coating at different rates.
Knowing how a coating resists water can assist determine how long it will last since water can cause coatings to degrade. Numerous things, such as a flaw in the coating itself, contamination of the substrate, or inadequate surface preparation, might lead to tests failing at 100% relative humidity. It is crucial to remember that the ASTM D2247 shouldn’t be viewed as an accelerated aging test because of how mild the test circumstances are.
Testing Water Resistance of Coatings as per ASTM D2247
In this ASTM D2247 test procedure, coated test specimens are exposed to an environment with a relative humidity of 100% in order to assess the coating’s water resistance. Condensation will be able to form on test specimens under these circumstances. ASTM D1735 and this procedure have a lot in common. Despite the fact that a different cabinet was used for this test. Additionally, a separate method is used to create the condensing fog in the same cabinet as for the ASTM G154 test.
In a closed cabinet with heated, saturated air and water vapor, test specimens are placed. The chamber is kept at a constant temperature of 38°C (100°F). Condensation forms on the specimens when the relative humidity (RH) is 100% and there is only a very slight temperature differential between the specimen and the surrounding vapor. By adjusting the test’s duration, the exposure condition is changed. Depending on the coating’s properties, water penetrates the coating at different rates.
Knowing how a coating resists water can assist determine how long it will last since water can cause coatings to degrade. Numerous things, such as a flaw in the coating itself, contamination of the substrate, or inadequate surface preparation, might lead to tests failing at 100% relative humidity. It is crucial to remember that the ASTM D2247 shouldn’t be viewed as an accelerated aging test because of how mild the test circumstances are.
