Star rating
From Wikipedia, the free encyclopedia
Many star ratings exist and are defined on a use case basis. Refer to the categories below for some standard uses.
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[edit] General Star Ratings
See: *Rating
[edit] Sunscreens
Star rating is a common method used in the UK and Ireland to describe the ratio of UVA to UVB protection offered by sun screen creams and sprays. Invented by Dr Diffley of the Boots Company in Nottingham UK, it has been adopted by most companies marketing these products in the UK. It should not be confused with SPF which is measured with reference to burning and UVB. One star products provide the least ratio of UVA protection, five star products are the best.
At one time UVA were thought to be the 'safe rays', the weaker rays that tanned you slowly. Now research has highlighted that although UVB is the most potent and more dangerous ray, because UVA is always present it increases the risk of skin cancer as well as premature ageing.
[edit] Freezer Ratings
European freezers, and refrigerators with a freezer compartment have a four-star rating to grade freezers.
* / temperature = -6°C. Maximum storage time for frozen food / 1 week
** / temperature = -12°C. Maximum storage time for frozen food / 1 month
*** / temperature = -18°C. Maximum storage time for frozen food / 3 months
**** / temperature = -21°C. Maximum storage time for frozen food / long term, up to 12 months
Fresh food can only be frozen in a freezer with a four star (****) rating.
