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" the assess that textile defends ultraviolet performance " national level intro
From;    Author:Stand originally
One, of the standard come on stage

About textile prevent ultraviolet function assess, the national level that our country neither one unites previously, country is right prevent ultraviolet fabric detect the Australia that the basis uses the popularity on international commonly / As/nzs 4399 of New Zealand standard - 1966. May 2002 the middle ten days of a month, institute of textile industry standardization drafted " the assess that textile defends ultraviolet performance " first draft, held authorized meeting of the standard in big talk, the club that course of study of Hangzhou heaven umbrella shared this standard on invitation is drafted and authorized job. Current, this standard had begun to carry out on Feburary 1, 2003. Standard number is: Gb/t 18830.

2, standard specification

" the assess that textile defends ultraviolet performance " national level includes 10 fields, the computation of the preparation of the instrument that uses like the principle of the explanation of term, test, test, sample, result is waited a moment. Nevertheless, the most important, also be an enterprise pay close attention to most should be the 9th about " assess and label " explain, I emphasize an explanation now this one.

The regulation in the standard: When the Upf of sample only the value is more than 30, and the transmitance of Uva is less than 5 % when, ability says for " defend ultraviolet product " , these two conditions are short of one cannot. This is constant a kind of product is " defend ultraviolet product " index.

Prevent ultraviolet product to there should be the content of 3 respects in the mark on label:

1, the number of national level: Gb/t 18830

2, Upf value: 30 + , or 50 +

(1) if of Upf determine the value is more than 30, and the transmitance of Uva is less than 5 % , the label is: 30 +

(2) if of Upf determine the value is more than 50, and the transmitance of Uva is less than 5 % , the label is: 50 +

3, make in order to is reached for a long time in drawing damp perhaps circumstance falls, this product place offers defend function may decrease.

3, the specification that is worth about Upf

Upf is the abbreviation of English Ultraviolet Protection Factor, namely ultraviolet ray defends coefficient. According to the definition in national level, what Upf points to is " the ultraviolet radiate that the computation when average effect has fabric to defend with the skin gives the ultraviolet radiate that the skin gives without the computation when defending is average the ratio of effect " . This definition is more abstract, we can understand the physical significance of Upf so, for instance Upf value is 50, the ultraviolet ray that has 1/50 with respect to the specification can pass through fabric. Upf cost is higher, defend with respect to what show ultraviolet ray the effect has been jumped over. But the label with the Upf highest value of the textile in national level is 50 + , namely Upf>50. Because Upf is more than 50 later, completely negligible to the influence of human body not plan.
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