... protection. 2.Composited with strong PET film TPT solar model backsheetWe have three types of TPT film, ... back sheet,it is made for the packing of solar cell models, superior light, easy to bend, ... Features as followed: propertyPE 20PE 30Thickness(mm)0.20.3colorWhite,black,transparentWhite,black,transparenttensile strength(Mpa)200200Elongation ... ^15breakdown voltage(KV)17.519 TPT solar panel backsheet