t is a outermost layer of the p.v module. Solar back sheet is a design to protect the inner component of the module. PV back sheet is a photovoltaic laminate that protects the PV module from UV, moisture and weather while acting as an electrical insulator. ITEM Laminated Composite Back Sheet for Photo Voltaic Module 3 Layered Structure with Outerlayer fluro-Polymer, Middle Layer Pet And inner Layer of FluroPolymer / UV Resistant Polymer)