IEVref:845-26-075ID:
Language:enStatus: Standard
Term: ultraviolet protection factor
Synonym1: UPF
Synonym2:
Synonym3:
Symbol: FUVP
Definition: measurement of the protective quality of a fabric sample against solar ultraviolet radiation, determined by in-vitro testing

Note 1 to entry: For in-vitro testing, the erythemal irradiance measured by a detector with the fabric sample under test in place is compared to the erythemal irradiance measured with no fabric present, where the source is typically a solar simulator. This is expressed as the quotient of the erythemal irradiance without fabric to the erythemal irradiance through fabric:

F UVP = 290 nm 400 nm E λ s er (λ)dλ 290 nm 400 nm E λ s er (λ)τ(λ)dλ MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadAeadaWgaaWcbaGaaeyvaiaabAfacaqGqbaabeaakiabg2da9maa laaabaWaa8qCaeaacaWGfbWaaSbaaSqaaiabeU7aSbqabaGccaaMe8 Uaam4CamaaBaaaleaacaqGLbGaaeOCaaqabaGccaGGOaGaeq4UdWMa aiykaiaaysW7caqGKbGaeq4UdWgaleaacaqGYaGaaeyoaiaabcdaca qGGaGaaeOBaiaab2gaaeaacaqG0aGaaeimaiaabcdacaqGGaGaaeOB aiaab2gaa0Gaey4kIipaaOqaamaapehabaGaamyramaaBaaaleaacq aH7oaBaeqaaOGaaGjbVlaadohadaWgaaWcbaGaaeyzaiaabkhaaeqa aOGaaiikaiabeU7aSjaacMcacaaMe8UaeqiXdqNaaiikaiabeU7aSj aacMcacaaMe8UaaeizaiabeU7aSbWcbaGaaeOmaiaabMdacaqGWaGa aeiiaiaab6gacaqGTbaabaGaaeinaiaabcdacaqGWaGaaeiiaiaab6 gacaqGTbaaniabgUIiYdaaaaaa@7684@

where ser(λ) is the erythema spectral weighting function, Eλ is the spectral irradiance, τ(λ) is the measured spectral transmittance of the item, and λ is the wavelength.

Note 2 to entry: The ultraviolet hazard spectral weighting function, SUV(λ), has been substituted for ser(λ) in special instances. If so used, the ultraviolet protection factor, FUVP, has to be noted as FUVP [S(λ)-weighted].

Note 3 to entry: The ultraviolet protection factor has unit one.


Publication date:2020-12
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