Improved abrasion resistance
As the RENOLIT REFLEXOLAR 1500 PO back sheet is UV stabilized and pigmented into the bulk, sand abrasion of the air side layer of the back sheet, if any, will only result into exposition of UV stabilized material. The visual effect of extensive sand abrasion is a superficial “sand color” discoloration (figure 1).
In the case of a classical back sheet with a transparent core PET layer, abrasion resistance of the thin UV protective layer is quite critical as un-stabilized PET will eventually be exposed to UV light, leading to back sheet cracking.
The behavior of a commercial PET coated back sheet is shown in figure 2. Already after 500 g of sand abrasion, the coating is eroded, exposing unprotected PET.