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Skincare #Sunscreen

Spraying sunscreen on an arm

What Do SPF and PA Numbers Measure? | Rules for Sunscreen Labeling

SPF and PA are indicators for different wavelengths of ultraviolet rays. Measurement follows ISO international standards and assumes an application amount of 2 milligrams per square centimeter. This is about where the numbers come from.

What Do SPF and PA Numbers Measure? | Rules for Sunscreen Labeling

SPF and PA are indicators for different wavelengths of ultraviolet rays. Measurement follows ISO international standards and assumes an application amount of 2 milligrams per square centimeter. This is about where the numbers come from.