When many users buy a UV aging test box, it is always difficult to judge its quality. They often shop around, or choose their feelings or prices. Details and methods of choosing a UV aging test box:
First, the choice of UV aging test box lamp
UV aging Test Chamber lights generally have two types of lamps: UVA-340 tube and UVB-313 tube; UVA-340 tube can well simulate short-wave ultraviolet rays in sunlight, that is, the cut-off wavelength from 365nm to sunlight is 295 nm. The short-wave ultraviolet rays produced by UVB-313 lamps are stronger than the sun's ultraviolet rays that usually irradiate the earth's surface, thus better accelerating the aging of materials. However, test tubes can cause unrealistic damage to some materials. UVB-313 lamps are mainly used for quality control and research and development, or for testing materials with high weather resistance. For a specific selection, users can consult the manufacturer of the UV aging test box to know which bulb is compatible with the bulb, and seek professional advice from the manufacturer;
2. Selection of light source for UV aging test box
Typically, UV aging Test Chambers have three light sources: daylight-type carbon arc lamps, xenon arc lamps, and fluorescent UV lamps:
1. In CHINA, daylight-type carbon arc lamps are rarely used at present, but have been widely used in Japan. Most of the JIS standards use daylight type carbon arc lamps. Its spectral energy distribution is also closer to that of sunlight. However, it is concentrated in the ultraviolet light of 370nm-390nm, and the simulation effect is not as good as that of xenon lamp. The speedup ratio is between xenon lamps and ultraviolet lamps.
2. Xenon arc lamp, it is currently believed that among the known artificial light sources, the spectral energy distribution of xenon arc lamp is most similar to the ultraviolet and visible light part of sunlight. By choosing the right filter, most of the shortwave radiation present in surface sunlight can be filtered out. Xenon lamps have a strong radiation peak in the near-infrared region of 1000 nm to 1200 nm, which generates a lot of heat. Therefore, you need to choose the appropriate cooling equipment to take away this part of the energy.
3. Fluorescent UV lamps, theoretically short-wave energy of 300nm~400nm is the main cause of aging. If this part of energy is increased, the effect of rapid testing can be achieved. The spectral distribution of the fluorescent ultraviolet lamp is mainly concentrated in the ultraviolet part, so that a higher acceleration magnification can be achieved. However, fluorescent UV lamps not only increase the UV energy in natural sunlight, but also increase the radiant energy that is not available in natural sunlight when measured on the surface of the earth, and this energy can cause unnatural damage. In addition, fluorescent light sources have no energy above 375 nm other than the narrow mercury spectral line, so materials sensitive to longer wavelength UV energy may not change upon exposure to natural sunlight. These inherent flaws can lead to unreliable results. Therefore, fluorescent UV lamps are inferior in analog. Three, function
Condensation, In many outdoor environments the material can be wet for up to 12 hours per day. Studies have shown that the main cause of this outdoor humidity is dew, not rain.
