选择名牌产品，提防普通伞滥竽充数假冒防紫外线伞。
selection of brand-name products, beware of the common umbrella just fake anti UV umbrella.
可以根据伞面的织物性质初步判断防紫外线性能。一般说来，棉、丝、尼龙、粘胶等的防紫外线性能较差，而涤纶较好。通常用来制伞的含涤面料有色丁布、麦克布等。此外，防紫外线性能以缎纹织物最好，以下依次是斜纹、平纹，颜色越深越好。
according to the fabric properties of the parachute surface, the anti ultraviolet performance can be judged preliminarily. Generally speaking, cotton, silk, nylon, viscose and so on anti ultraviolet performance is poor, and polyester is better. Usually used colored umbrella fabric containing polyester fabric, Mcb etc.. In addition, anti UV performance to the best satin fabrics, followed by twill, plain weave, the darker the better.
防晒伞能不能防紫外线，布料质地并不是最重要的，主要的还厂家是对布料做了什么样的技术处理。一般棉、麻质地的布料本身就有一定的防紫外线性能，只是程度不强罢了。
sunscreen can not prevent ultraviolet light, fabric texture is not the most important, the main manufacturer is what kind of technical treatment of cloth. Generally cotton, linen fabric itself has a certain anti ultraviolet performance, but the degree is not strong.
前两年市场上销售的防晒伞多是在伞面上涂了一层银胶，这样的处理可以反射和阻挡一些紫外线的直射。但银胶的质量有好有坏，技术条件好的厂家生产的防晒伞银胶不容易脱落，而一些廉价防晒伞为了滥竽充数，只是给伞面上涂了一层银色，经过几次阳光照射后就掉了色。
Most of the sunscreen sold in the first two years is a layer of silver coated on the surface of the umbrella, which can reflect and block the direct rays of some ultraviolet rays. But the quality of silver colloid has good and bad, good technical conditions of sun umbrella manufacturers to produce silver plastic is not easy to fall off, and some cheap sun umbrella for every one, only to the umbrella surface coated with a layer of silver, after several times of sunlight fell off color.
伞面在湿的情况下，由于水的光学传导作用，紫外线的透过率增加，防护效果降低。因此，湿伞不宜用于防紫外线。
Under the wet condition of the 8. parachute, the transmittance of ultraviolet light is increased and the protective effect is reduced because of the optical conduction of water. Therefore, the umbrella should not be used to prevent ultraviolet light.
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