UV light, which is the most responsible for photo-degradation to materials. Accelerated Weathering UV chamber adopts fluorescent UV lamp as the light source. Its inner temperature and humidity can be properly controlled to obtain the periodic condensation on the sample for fully evaluating the damaged factor caused by sunlight, moisture and temperature (materials aging phenomenon includes fading, intensity reduction, cracking, flaking, chalking, and oxidation). Reproducible and reliable weathering data can be generated in just a few days or weeks of testing which is identical to natural outdoors which may occur over months or years. The test data can help in selection of new material, improvement of existing material to improve product durability.

Fluorescent UV light can emulate the effect of sunshine, while condensation and water spray system can emulate the effects of rain and dew. During the test, radiation energy and temperature are controllable. A typical test cycle generally carries out under strong irradiation of UV light or in the dark and wet condensation period with 100% relative humidity. These tests generally applied in the fields of paint and coatings, automotive industry, plastic, wood, glue, etc.

According to different testing requirements, we choose different wavelength UV lamps, this is because each type UV lamps produce different irradiance energy and wavelength. Generally speaking, UV lamps can be divided into UVA and UVB.