Information
on the resistance of Alnet's UV Ultrablock Shade Cloth: UPF
- What does it mean?The
UPF rating indicates how effective a fabric is at blocking out solar ultraviolet
radiation. UPF ratings range from 15 to 50 with higher ratings indicating more
effective blocking and therefore better protection from the fabric. Fabrics that
test higher than UPF 50 are rated as UPF 50+.
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. Factors
that contribute to the UPF rating of a fabric are:  | Composition
of the yarns (cotton, polyester, etc) |
| Tightness
of the weave or knit (tighter improves the rating) |
| Colour
(darker colors are generally better) |
| Stretch
(more stretch lowers the rating) |
| Moisture
(many fabrics have lower ratings when wet) |
| Condition
(worn and faded fabrics may have reduced ratings) |
|
Finishing (some fabrics are treated with UV absorbing chemicals) |
Alnet's
UV Ultrablock is a superior product that offers you great value for money. Do
not settle for anything less! | 
