UPF is the abbreviation of English Ultraviolet Protection Factor, which is ultraviolet protection factor.
According to the definition in the national standard, UPF refers to “the ratio of the average effect of ultraviolet radiation calculated when the skin is unprotected to the average effect of ultraviolet radiation calculated when the skin is protected by fabrics.”
This definition is relatively abstract. We can understand the physical meaning of UPF in this way. For example, a UPF value of 50 means that 1/50 of the ultraviolet rays can penetrate the fabric.
The higher the UPF value, the better the UV protection effect. However, the national standard for textiles with high UPF value is 50+, that is, UPF>50. Because after UPF is greater than 50, the impact on the human body is completely negligible.
The standard “Evaluation of UV Protection Performance of Textiles” promulgated by the General Administration of Quality Supervision, Inspection and Quarantine stipulates:
A. Only when the UPF value of the sample is greater than 30 and the transmittance of UVA is less than 5%, can it be called an “UV-resistant product”. These two conditions are indispensable. This is a measure of whether a product is a “UV protection product.”
B. Anti-UV products should have three aspects on the label:
1. National standard number: GB/T18830-2009
2. UPF value:
3. 30+, or 50+
Note:
If the measured UPF value is greater than 30 and the UVA transmittance is less than 5%, the mark is: 30+
If the measured UPF value is greater than 50 and the UVA transmittance is less than 5%, the mark is: 50+
The protective properties provided by this product may be reduced with long-term use and when it is stretched or wet.
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