Several factors that cause the aging of the specimens cause the three main factors of material aging are high temperature, light and humidity. Any one of these three factors will cause the aging damage of the material, but they tend to act at the same time, and the resulting damage will be Greater than any of these factors alone. First, high temperature When the temperature increases, the damage of light will increase. Although temperature does not affect the main photoreactions, it does affect secondary chemical reactions. Laboratory burn-in tests must provide precise temperature control, and the process of aging is usually accelerated by increasing the temperature. Second, lighting Different materials have different sensitivities to light. For durable materials such as most paints and plastics, the short wavelength band of ultraviolet light is responsible for the aging of most polymers. However, for materials that are not so durable, such as some pigments and dyes, the long wavelength and even visible light of UV light can also cause serious aging. Third, wet Dew, rain and high humidity are the main causes of moisture hazards. Studies have shown that items placed outdoors are exposed to moisture every day for an extended period of time (average 8-12 h daily). Studies have found that dew formed by moisture is a major factor in outdoor dampness. Dew is more harmful than rain because it takes longer to adhere to the material and causes more severe moisture absorption. Of course, rain damages the material, and rain will cause thermal shocks. For example, a car that has increased in temperature on a hot summer day suddenly cools down due to showers, causing shocks. The mechanical erosion caused by rain erosion also accelerates the aging of the material. For example, the wood coating removes the surface aging layer due to the rain, and exposes the unaged inner layer to the sunlight, thereby further aging. For indoor materials, the main effect of moisture is often mechanical stress, which is caused by the material trying to maintain a moisture balance with the surroundings. The greater the humidity experienced by the material, the greater the stress that needs to be overcome. The humidity environment is also an important factor in the aging of outdoor materials. In the outdoor, the relative humidity (RH) will affect the drying speed of a wet material. Shot Blasting Equipment,Fitting Shot Blasting Equipment,Cast Iron Fitting Line,Cast Iron Fitting Shot Blasting Equipment Wuan City Kunyu Metal Products Co.,Ltd , https://www.kunyucasting.com