UPF & TESTING
UV-clothing are designed with fabrics that are rated for its level of UV-protection. Factors that contribute to the UPF rating of a fabric are:
- Composition of the yarns. There is no chemical process used, the UPF protection rating
is achieved by Carvico’s fabric thanks to the construction and quality of the yarns used.
- Tightness of the weave or knit (tighter improves the rating)
- Colour (darker colours are generally better)
- Stretch (more stretch lowers the rating)
- Moisture (many fabrics have lower ratings when wet)
- UPF50+ (Australian Standard, ARPANSA Agency)
- A garment with a UPF of 50 only allows 1/50th of the UV radiation falling on the surface of the garment to pass through it. In other words, it blocks 49/50ths or 98% of the UV radiation.
UPF testing involves exposing a fabric to ultraviolet radiation (UVR) and measuring how much is transmitted through the sample. Different wavelengths of radiation in the UVR spectrum have different effects on human skin and this is taken into consideration when calculating the UPF rating.
Fabrics tested according to UV801, means a more reliable UPF factor, where the fabrics are tested in wet and stretched conditions.
In case of clothing, the stretching of a fabric during wear, moisture from perspiration or water and wear during use, affect the sun protection factor and is taken into consideration.
Furthermore, the sun protection factor is also affected during and after care of the textile. The textile material is therefore laundered as part of the test and wet during measurement and stretched.