CTFA Standards - SANS 1557:2019 – Sunscreen products

SANS 1557:2019 Edition 4 51 E.2.2.2 Apply product to designated dry SPF sites (MEDps [Product(a)]; MEDps [Product(b)] etc.). E.2.2.3 Allow 15 min to 30 min for the product to dry. E.2.2.4 Expose the test product-treated dry sites [MEDps Product(a), MEDps Product(b), etc.] to progressive UV doses in accordance with 8.3.5. E.2.3 Day 2 E.2.3.1 Assess the erythemal reactions from previous day’s UV exposures on unprotected, dry MEDus sites and determine the dry MEDus for unprotected, non-water-immersed skin. E.2.3.2 Assess the erythemal reactions from previous day’s UV exposures on test product- protected dry MEDps sites and determine the dry MEDps for test product-protected, non-water- immersed skin. E.2.3.3 Calculate the individual dry SPF (SPFis). E.2.3.4 Apply product to test sites designated for water immersion (MEDpw [Product(a)], MEDpw [Product(b)] etc.). E.2.3.5 Allow to dry for 15 min to 30 min. E.2.3.6 Immerse volunteer in water for 20 min with continuous water circulation. E.2.3.7 Remove volunteer from immersion equipment and allow test sites to air dry with no towelling for 15 min. E.2.3.8 Return volunteer to immersion equipment and immerse in water for a further 20 min with continuous water circulation. E.2.3.9 Remove volunteer from immersion equipment and allow test sites to air dry with no towelling for 15 min or until the test site is completely dry. Ensure that all test sites are free from water droplets. If water droplets are present, extend air drying time. E.2.3.10 Expose test product-treated water-immersed sites [MEDpw Product(a), MEDpw Product(b) etc.] to progressive UV doses in accordance with 8.3.5. E.2.3.11 Expose the unprotected MED (MEDuw) to progressive UV doses in accordance with 8.3.5. NOTE This unprotected MED is post-immersion in water so as to be compatible with the protected wet MEDpw. E.2.4 Day 3 E.2.4.1 Assess the erythemal reactions from previous day’s UV exposures on unprotected, wet MEDuw sites and determine MEDuw for unprotected skin, after water immersion. E.2.4.2 Assess the erythemal reactions from previous day’s UV exposures on test product- protected, wet MEDpw sites and determine MEDpw for test product-protected, water-immersed skin. E.2.4.3 Calculate individual wet SPF (SPFiw (see 9.2.6.2)). NOTE 1 If necessary, the test may be shortened to cover only two days by combining days 1 and 2. In this case, the dry MED and wet MED determinations are then conducted on the same day with an assessment of all erythemal responses on the start of day 2. If this shortened procedure is adopted, then the investigator should be aware that water immersion, subsequent to exposing the skin to UV light in order to determine the dry SPF, might affect the dry SPF measured. © SABS © SABS. This non-printable standard is exclusively for members of the Cosmetic, Tolietry and Fragrance Association of South Africa (ctfa) granted access online through its password-protected and member-specific portal in accordance with publishing and copyright exploitation agreement no. 014/009/20-049. The agreement will expire after one year unless renewed. © SABS. This non-printable standard is exclusively for members of the Cosmetic, Tolietry and Fragrance association of South Africa (ctfa).