SPF值是日光防護系數 sun protection factors 的縮寫,它是防曬化妝品保護皮膚,避免日曬紅斑的一種性能指标。所謂日曬紅斑也稱為紫外線紅斑,主要是日光中的UVB引發的一種皮膚紅斑反應。
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