Organic coatings on exterior exposure are subjected to attack by degrading elements of the weather, particularly ultraviolet light, oxygen, and water. This practice may be used for evaluating the protective behavior of polish film applied to a coating. This polish-coated coating is then exposed in an apparatus that produces ultraviolet radiation, temperature, and water condensation for a given time period.

No single light exposure apparatus, with or without water, can be specified as a direct simulation of natural exposure. This practice does not imply a specific correlation with outdoor exposure. It is, however, useful in screening the protective quality of a polish within the test parameter.

1.1 This practice covers the selection of test conditions from Practice G 53 to be employed for exposure testing of polish-coated paint, related coatings, and materials. This practice covers the basic principles and operating procedures for using fluorescent ultraviolet (UV) and condensation apparatus to simulate the deterioration caused by sunlight and water as rain or dew.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.