Gester Instruments | Professional Textile, Footwear and PPE Testing Equipments Manufacturers Since 1997
Analysis of UV aging test of UV aging test machine
According to ASTM G154, UV (ultraviolet) cannot simulate the full spectrum of sunlight. The main reason for UV aging is caused by the short-wavelength wavelength of ultraviolet rays of 300~400nm. In the short-wavelength region of ultraviolet rays, that is, from 365nm to the low-band wavelength of sunlight, UV fluorescent lamps can simulate sunlight well, and the UV aging test machine uses UV fluorescent lamps. For UV aging test, (Hong Kong) Co., Ltd. can provide this instrument and can provide customers with various solutions. Customers in need are welcome to inquire. 1. The influence of sunlight on products: Climate and sunlight irradiation are the main causes of damage to coatings, plastics, inks and other polymer materials, such damage includes loss of light, fading, yellowing, cracking, peeling, embrittlement, strength Lowering and stratification. Even indoor light and sunlight transmitted through glass windows can degrade some materials, such as causing pigments, dyes, etc. to fade or discolor. Since solar radiation has dual effects of thermal radiation and photochemical effects, high temperature test cannot replace light aging test, and pure ultraviolet radiation and infrared radiation cannot replace solar radiation test. 2. UV aging test stage: UV aging test can set three aging modes: illumination, condensation and spray. The illumination stage simulates the light length of the day in the natural environment (usually between 0.35W/m2~1.35W/m2, and the solar light intensity at noon in summer is about 0.55W/m2) and the test temperature (50℃~85℃), In order to simulate various use environments of the product and meet the test requirements of different regions and industries. Condensation stage To simulate the phenomenon of fog on the surface of the sample at night, in the condensation stage, turn off the fluorescent UV lamp (dark state), only control the test temperature (40~60℃), and the humidity of the sample surface is 95~100%RH. The spray stage simulates the process of rain by continuously spraying water on the surface of the sample. Because the artificial UV accelerated aging test conditions are much harsher than the natural environment, the aging damage that can occur in the natural environment for several years can be simulated and reproduced in a few days or weeks. 3. There are three kinds of commonly used UV aging lamps: UVA-340: The main purpose is to simulate the short and medium wavelength range in the ultraviolet part of sunlight, and it is generally used for the photoaging test of outdoor products. UVA-351: The main purpose is to simulate the short and medium wavelength range in the ultraviolet part of the sunlight filtered by the window glass, which is generally used for indoor products. UVB-313: They emit a considerable amount of radiation below 300nm, which is the nominal cut-off wavelength of solar radiation. This will cause some aging phenomena that do not occur outdoors. It is not recommended to use this light to simulate sunlight. This test is widely used primarily for durability testing of accelerated materials as a qualitative comparison of two or more materials.
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