UV radiation is a key factor that contributes to human skin ageing. Overexposure to UV radiation can cause many skin problems. In order not to expose the skin to the risk of harmful radiation from the sun, cosmetic products with a sun protection factor (SPF) should be used. SPF is a factor that determines how much longer we can stay in the sun – after applying a given product – until skin redness occurs, compared to the equivalent time of staying in the sun – without skin protection.
Today, there is a wide range of products on the market with various declared SPF factors, from 2 to >50.
Therefore, it is the manufacturer’s responsibility to confirm the declared value of the factor on the label of the cosmetic product with laboratory tests.
JARS S.A. offers a test to determine the SPF factor. The UVB protection test is performed with an in vitro method using a specialized spectrophotometer that imitates Solar Light.
This method allows to determine the SPF value by in-vitro method:
- confirmation of the presence of UVA and UVB filters;
- evaluation of the UVA/UVB sun protection efficacy according to the Boots scale;
- determination of the Erythema factor;
- determination of the critical wavelength;
- confirmation of the declaration of water-resistance of the product.
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