ASTM C1442-14 (R2021) PDF Download

ASTM C1442-14 (R2021) is a standard practice that outlines the procedures for conducting tests on sealants using artificial weathering apparatus. The purpose of this practice is to determine the effects of actinic radiation, elevated temperature, and moisture on sealants and their constituents under controlled laboratory conditions.

The standard emphasizes the importance of considering the ability of the artificial test conditions to replicate the property changes and failure modes that occur in real-world environments. It also highlights the need to assess the stability ranking of sealants before conducting tests. The spectral power distributions of the exposure sources and the different conditions used in the laboratory weathering tests may result in varying performance rankings and failure modes of sealants. Therefore, comparisons should not be made between the different types of apparatus.

The standard acknowledges that variations in results may occur when operating conditions are varied within the accepted limits. Therefore, it states that all test results must be accompanied by a report of the specific operating conditions. It also emphasizes that no laboratory exposure test can fully simulate actual use conditions in outdoor environments. The relative durability of sealants can vary depending on factors such as UV radiation, moisture, humidity, temperature, pollutants, and location. The agreement in test results among different laboratories can be improved by including a control material of known outdoor performance.

The standard highlights that the acceleration factor, which relates the exposure time in a laboratory test to exposure time outdoors, is material-dependent and cannot be assumed to be applicable to other materials. It also emphasizes the importance of operating the equipment according to the relevant practices for regulation of line voltage, temperature control, humidity control, and maintenance of equipment.