Accelerated Weathering (QUV)

Accelerated Weathering (QUV) ASTM G154, ASTM D4329, ASTM D4587, ISO 4892

Accelerated weathering is a method of testing materials and coatings to determine their ability to withstand harsh weather conditions. The effect of weathering is measured by exposing test samples to varying conditions of the most aggressive components of weathering, including ultraviolet radiation, moisture, and heat.

A QUV test chamber is used for this testing process. This chamber uses fluorescent lamps to provide a radiation spectrum centered in the ultraviolet wavelengths and controlled temperature and moisture to simulate outdoor weathering conditions. The test samples are subjected to cycles of exposure to intense ultraviolet radiation followed by moisture exposure, simulating extended periods of outdoor weathering.

It is important to note that no direct correlation can be made between accelerated weathering duration and actual outdoor exposure duration. However, performance comparisons under controlled conditions of accelerated weathering can be compared to documented performance of the materials and coatings that have experienced extended periods of end-use exposure.

Typically, flat plaques or disks are used for accelerated weathering studies. The standard sample holders can accommodate samples of different sizes, ranging from 3 x 12 inches to 3 x 6 inches. The data obtained from the testing process includes measurements of various physical properties such as Haze, Transmission, Yellowness Index, Color Change, and Impact Strength.

Accelerated is a valuable tool in evaluating the performance of materials and coatings in harsh weather conditions. By simulating the effects of ultraviolet radiation, moisture, and heat, this testing process provides a controlled environment for evaluating the durability of materials and coatings in a relatively short amount of time.