Sunscreen Numbers Meaning

The number is calculated as the amount of uv radiation required to cause a sunburn with a user wearing the sunscreen as opposed to not wearing the sunscreen.

Sunscreen numbers meaning. Honestly that isn t enough protection. Science tells us that an spf 15 can filter 93 of the sun s uvb rays. Spf stands for sun protection factor and is a measure of the protection against uv b rays offered by a given sunscreen. Then they redo the test with sunscreen.

The spf number tells you how much uvb light those are the ones that cause sunburn a sunscreen can filter out. Spf 30 can filter 97 of the sun s uvb rays. Spf or sun protection factor numbers were introduced in 1962 to measure a sunscreen s effect against uvb rays. For example an spf 2 product protects your skin just as effectively as one with an spf of 30.

The higher the spf number the greater the degree of protection. Here s an explanation of spf ratings the meaning behind all those numbers and ultraviolet radiation. To determine a sunscreen s spf testers round up 20 sun sensitive people and measure the amount of uv rays it takes them to burn without sunscreen. Spf or sun protection factor is a number assigned to sunscreens that indicates the amount of protection they provide against uvb radiation the type that causes sunburns.

However spf 2 sunscreen will need to be applied more frequently. What the spf number means a higher spf doesn t indicate superior sun protection it indicates that you will remain protected in the sun for a longer amount of time. A sunscreen s spf or sun protection factor refers to its ability.