UV aging belongs to sunlight aging, UV is the abbreviation of Ultraviolet (ultraviolet), and is usually used to evaluate the aging speed of products under ultraviolet light. Sunlight aging is the main aging damage to materials for outdoor use. It will be subject to a certain degree of sunlight aging or aging caused by ultraviolet rays in artificial light sources (such as ultraviolet lamps, ultraviolet bands in fluorescent lamps, etc.).
The solar radiation is mainly concentrated in the visible light part (0.4-0.76μm), and the wavelengths of infrared rays (>0.76μm) longer than visible light and ultraviolet rays (<0.4μm) are less. In the total radiant energy, the wavelength between 0.15 and 4 μm accounts for more than 99%, and is mainly distributed in the visible light region and the red and ultraviolet regions. The visible light region accounts for about 50% of the total solar radiation energy, and the infrared region accounts for about 43%. The solar radiation in the ultraviolet region is very small, accounting for only about 7% of the total.
Ultraviolet light is a general term for radiation with wavelengths from 0.01 to 0.40 microns in the electromagnetic spectrum, which cannot cause people's vision. Ultraviolet light is divided into A rays, B rays and C rays (referred to as UVA, UVB and UVC), and the wavelength ranges are 400-315nm, 315-280nm and 280-190nm respectively.
According to the engineer, the UV Accelerated Weathering Tester cannot simulate the full spectrum of sunlight. Its principle is that for durable materials exposed to the outdoors, the short-wavelength wavelength of ultraviolet rays of 300~400nm is the most important cause of aging damage. As can be seen from the figure below, in the short wavelength region of ultraviolet light, that is, from 365nm to the lowest wavelength of sunlight, UV fluorescent lamps can simulate sunlight well.
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