Rapid Determination of SPF value sunscreen - SPF Test Method for Measuring Machine

Rapid Determination of sunscreen SPF value - a measure of SPF testing machine to test cosmetics SPF value, measured SPF SPF, sun protection factor SPF sun protection factor detecting means SPF sun protection factor, SPF is the Sun Protection Factor abbreviation, indicating sunscreen can play the level of effectiveness of sunscreen. It is based on the minimum erythema dose skin determined. Skin redness after sun exposure, called "erythema syndrome", which is the most mild reactions to the skin to the sun. Minimum erythema dose, skin erythema shortest time in the sun. After using sunscreen, minimum erythema dose will growth of the skin, then the sunscreen's SPF SPF was: SPF = minimum erythema dose values ??(with sunscreen after) / minimum erythema dose (before use sunscreen) SPF sun protection factor apply to everyone, the calculation is: Assuming the UV intensity will not change because of the time, a person without any protective measures to stay under the sun if the skin turns red after 20 minutes, when he used SPF15 sunscreen, showing extended 15 times longer, which is at 300 minutes after drying the skin will be red. SPF sunscreen SPF is a measure of the sun's ultraviolet UVB defense capability detection index. There is also an index of PA. PA is a Japanese Cosmetic Industry Association announced the 1996 "UVA to prevent the effect of assay standards" is the current standard of Japanese goods in the most widely adopted, the defense effect is divided into three levels, namely PA +, PA ++, PA +++, PA + represents a valid , PA ++ represents quite effective, PA +++ said he was very effective. SPF sunscreen PA is a measure of the sun's ultraviolet UVA's defense capability detection index. But the value of the PA, there is no certification standards internationally. Sunscreen SPF value measurement method: currently the most conventional is to take human skin test SPF measurement methods, it can also be measured by the machine quickly SPF measurement method. Test cycle: human skin test (2-3 months); machine measurement method (15 working days)