ASTM D6695 is a standard practice that describes a procedure for accelerated exposure testing of paints and related coatings using a xenon arc light source. The test is designed to simulate the effects of outdoor exposure on coatings by exposing them to artificial light and water at high temperatures. The standard includes procedures for sample preparation, exposure conditions, and evaluation of test results. The purpose of this standard is to provide a consistent and reliable method for evaluating the durability and weatherability of coatings.
The test method described in ASTM D6695 involves exposing coated samples to xenon arc light in a chamber under controlled conditions of temperature and humidity. The light source used in the test emits light with a spectrum that closely matches the spectrum of the sun. In the water spray cycle, the effect of outdoor weathering on the coating is simulated, and the exposure conditions are specified according to the total irradiance, exposure time and other parameters.
After the exposure period, the changes in appearance, color, gloss, adhesion and other properties of the sample are evaluated, and the test results are compared with the unexposed control sample to evaluate the performance of the coating under accelerated exposure conditions.
ASTM D6695 is commonly used in quality control, research and development of new coatings in the coatings industry. This test can be used to predict the performance of coatings under outdoor exposure conditions and compare the performance of different coatings. This standard provides a reliable basis for accelerated exposure tests. and reproducible method, saving time and cost compared to outdoor exposure testing.
