SPF

abbreviation for

1. sun protection factor: the effectiveness of a sunscreen in protecting the skin from the sun's ultraviolet UVB radiation, as rated on a scale of increasing protectiveness, the number being the ratio of the radiation dose needed to produce minimal redness when using sunscreen compared to the dose needed to produce the same redness without sunscreen:

   An SPF of 15 will allow you to stay in the sun 15 times longer.

S.P.F.

¹

abbreviation for

1. vet science specific pathogen free; denoting animals specially bred to ensure that they are free of specified diseases

SPF

²

abbreviation for

1. sender policy framework: a mechanism designed to prevent an e-mail address being duplicated and used as a false address from which to send unsolicited e-mails
2. sun protection factor: an indicator of how effectively a sun cream, lotion, cosmetic, etc, protects the skin from the harmful rays of the sun

   SPF 25

Example Sentences

The SPF have been in dispute with bosses regarding pay and conditions, particularly over the amount of extra hours being worked.

From BBC

We wait until the cool air of the morning or evening to exercise, dust off our biggest water bottle and slather ourselves in SPF 75.

From Los Angeles Times

It comes in black, blue and green with an SPF sunshade for baby.

From Seattle Times

He encouraged people to wear broad-brimmed hats that fully shield the face from UV rays and to use sunscreen with at least SPF 30 protection.

From Seattle Times

Use a lip product with an SPF 30 or higher if you plan to be outdoors, even in winter, Del Campo said.

From Seattle Times