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Analysis of UV Protection Factor UPF
The UV protection factor UPF, also known as the UV shielding factor, indicates the ability of the fabric to protect against UV rays. The UV transmittance tester is a testing instrument. According to the definition in the national standard, UPF refers to the ratio of the average effect of UV radiation calculated when the skin is unprotected to the average effect of UV radiation calculated when the skin is protected by a fabric. Ultraviolet transmittance TAV: refers to the percentage of the ratio of the ultraviolet radiation intensity transmitted by the ultraviolet transmittance tester when there is a sample to the ultraviolet radiation intensity when there is no sample. According to different radiation wavelengths, ultraviolet rays can be divided into three bands: UVA (315-400nm), UVB (280-315nm) and UVC (below 280nm). UVA is also known as the tanning segment: the ultraviolet rays in this band are rarely absorbed by the ozone layer, and most of them can reach polyester and cotton, penetrate the human dermis, and damage the collagen and elastin of the skin. Over time, the skin will age, lose elasticity, and appear wrinkles. , melanin deposition. UVB is generally called the sunburn segment: it can be absorbed by the ozone layer, and only a small amount reaches the ground, but the damage of UVB to the skin is much greater than that of UVA, and its penetrating power can reach the epidermis, causing skin redness, melanin, sunburn, and even cause burns. Excessive UVB irradiation can also induce skin diseases, cause cataracts, and reduce the body's immune function. UVC is almost absorbed by the ozone layer and basically cannot reach the ground, so the impact on the human body cannot be considered. According to the 'Evaluation of Anti-UV Performance of Textiles' standard issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China: A. Only when the UPF value of the sample is greater than 40 and the transmittance of UVA is less than 5%, it can be called“UV protection products”, these two conditions are indispensable. This is a measure of whether a product is“UV protection products”index of. B. Anti-ultraviolet products should be marked with three aspects on the label: 1. National standard number: GB/T 18830-2009; 2. UPF value: 40+, or 50+ If the measured value of UPF: 40<UPF≤50, and the transmittance of UVA is less than 5%, the mark is: UPF40+ If the measured value of UPF is greater than 50, and the transmittance of UVA is less than 5%, the mark is: UPF50+ The test standard for the resistance to ultraviolet radiation of foreign textiles: AATCC 183 BS EN 13758-1 BS EN 13758-2 BS 8466 Annex A ASTM D6603 ASTM D6544 BS EN ISO 7914 'More about material testing: https://www.baijiantest.com/
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