Determination of the UPF according to UV STANDARD 801 is based on maximum radiation intensity and the sun spectrum in Melbourne/Australia on the 1st of January of a year (i.e. at the height of Australian summer) and the most sensitive skin type for the wearer. Usage conditions were taken into account for testing.
For the Australia-New Zealand standard (AS/NZS 4399), however, measurements are carried out only on 'as new' textile materials which are dry and not stretched. This standard is also based on the sun spectrum in Melbourne/Australia on 1st of January.
Since the sun spectrum in the northern hemisphere is different to that in Australia, the measurement method for the European standard EN 13758-1 uses the sun spectrum of Albuquerque in New Mexico/USA which approximately corresponds to that in southern Europe. Apart from that the test conditions of the AS/NZS 4399 apply, i.e. the UPF is determined on new, dry and non-stretched textiles.
In the USA, UV tests are often carried out according to the American standard AATCC 183, using the sun spectrum of Albuquerque/New Mexico, just like the European Standard. As with the Australia-New Zealand and the European standard measurements are carried out on new textile materials.
The sun protection factor determined by the standards AS/NZS 4399, EN 13758-1, AATCC 183 is not reliable because they do not take into account the specific stress through usage, neither for clothing nor for shading textiles. Only the UV STANDARD 801 offers reliable sun protection even for wet and stretched materials.
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