Seaside sunshade

         UV protection umbrella first of all, this umbrella must contain anti-UV logo, and marked UPF value. UV protection evaluation indicators are mainly two: one is UVR transmission ratio: with or without samples of UV transmission radiation flux ratio; two is UPF UV protection factor, UPF is the English Ultraviolet Protection Factor abbreviation, according to the national standard definition, UPF is "skin without protection calculated when the average effect of ultraviolet According to the national standard definition, UPF is "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 fabric". For example, if the UPF value is 50, it means that 1/50 of the UV radiation can pass through the fabric. the higher the UPF value, the better the UV protection. The highest UPF value of textiles in the national standard is 50+, that is, UPF>50, because after UPF is greater than 50, the impact on the human body is completely negligible. AQSIQ promulgated the "textile UV protection performance assessment" standard is this: only when the sample UPF value is greater than 40, and UVA transmission rate of less than 5%, can be called UV protection products, the two conditions are missing. This is a measure of a product is not "UV protection products" indicators. Therefore, the formal UV protection umbrella in the label marked with three aspects

(1) The national standard number: GB/T 18830-2009

(2) UPF value.

(3) 40+, or 50+

                  Now most of the UV protection shade fabric for satin fabric, Mike cloth and other materials containing mainly polyester fabric, that is, polyester fiber, which is the mainstream material on the market, as for other materials most of the effect is not as good as polyester; some are high-density touch fabric, in fact, high-density touch fabric is not as good as polyester sunscreen, its main benefit is not easy to wear, soft and comfortable, easy to clean only. In addition, there are some manufacturers of the so-called new term materials, there is generally no national certification, there are many beak head only, in addition, UV protection performance to satin fabric is the best, the following in order, twill, plain.