... ,double protection. 2.Composited with strong PET film TPT solar model backsheetWe have three types of TPT film,black,white ... as back sheet,it is made for the packing of solar cell models, superior light, easy to bend, transmittance is ... Thicknss:0.3,0.35,0.4,0.5mm,length:100 meters per roll or 200 meters per roll, max ... resistivity(Ω)3x10^153x10^15breakdown voltage(KV)17.519 TPT solar panel backsheet