Summer skin care program sun umbrella: how much UV block?
In the hot summer days, the major salt factories in Shandong Weifang, the salt producing city, became the world of umbrellas. Because salt production is open-air operations, with the increased awareness of their own health protection, many salt workers have purchased plastic sun umbrellas to resist UV. However, many salt workers do not understand how much ultraviolet the plastic sunscreen can block. After use, they think that “sunscreens have been wiped off by white rubs and sunscreens have been beaten by the sunâ€.
At the moment, the plastic sun umbrellas that are sold on the market are mainly made of high-quality plastic cloth, polyvinyl chloride sardinium cloth, silver tape, dyed plastic cloth, and fat and thin silk cloth. Different fabrics have different UV protection effects, and some sun umbrellas made of ordinary plastic cloth have poor shading and are easily damaged.
UV b can cause sunburn, and UV a can cause tanning. The spf value indicated on a general plastic sun umbrella is the value of the sunburn-resistance value against UV b. As to whether it is UV-a, you need to pay attention to the description of the product. Some products are marked in Chinese, while others are represented by pa (pa+ means effective protection time, the more + signs, the better the protective effect). I found in the observation that there are not too many pa- rated plastic umbrellas on the market, and the spf value can only indicate the length of the product's sun-blocking time and does not determine how much ultraviolet light can be blocked.
As there is no uniform testing standard for plastic sun umbrellas at present, the sun protection effect completely depends on the manufacturer's instructions. To a large extent, the manufacturers are still saying that it is difficult for consumers to make accurate judgments when they purchase. This situation must not worry consumers. Consumers hope to have a set of objective, fair and uniform standards to regulate.
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