Many star ratings exist and are defined on a use case basis. Refer to the categories below for some standard uses.

General Star Ratings

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See: *Rating

Sunscreens

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Star rating is a common method used in the UK to describe the ability of a sunscreen to protect against UVA radiation. Invented by Dr Diffley of the Boots Company in Nottingham UK, it has been adopted by most companies marketing these products on the UK market. It should not be confused with SPF which is measured with reference to burning and UVB

Freezer Ratings

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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.

See also

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• Refrigerator
• Seasonal energy efficiency ratio (SEER)

Energy