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Rate of Sun Protection measured with Sun Protection Factor (SPF)
Uncategorised Posted by gaytravel on Wed, Mar 15th, 2017 @ 11:13:58 AM 8 0
We measure protection against the Sun in SPF. The abbreviation “SPF” stands for Sun Protection Factor and was introduced in 1974.
Sun Protection Factor
SPF 15 means: 1/15 of the burn radiation will reach the skin.
SPF 30 means: 1/30 of the burn radiation will reach the skin.
SPF 50 means: 1/50 of the burn radiation will reach the skin.
For given SPF 15, SPF 30, SPF 50 we assume that suncream is applied evenly at a thick dosage of 2 milligrammes per square centimetre.
We can measure the effectiveness of a sunscreen by multiplying by the length of time it takes to suffer a burn without sunscreen.
A person who develops a sunburn in 10 minutes when not wearing a sunscreen will avoid sunburn for 150 minutes if wearing a sunscreen with an SPF of 15.
Sunscreens with higher SPF do not remain effective longer than with lower SPF and must be continually reapplied as directed, usually every two hours.
Products of different SPF
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