UL Grants RTI Rating to Arkema's Black Kynar® Film Used for PV Backsheet
Arkema Inc. announces that Underwriters Laboratory (UL) has granted a final Relative Thermal Index (RTI) rating of 150°C mechanical and 140°C dielectric for its black Kynar® film, used in the construction of photovoltaic backsheet. This RTI rating is among the highest that has been granted by UL. The new, black version of Kynar® film will enable solar panel module makers to source black Kynar®-based backsheets to produce modules which can be more visually appealing and consistent in color to the dark silicon cells. The backsheet provides insulation and protection from electric shock. The Kynar® film typically is the outer layer of the backsheet laminate structure, where PET film is used as the primary dielectric layer. However, PET weathering performance and hydrolysis resistance is poor. "The primary function of the Kynar® film is to protect the PET such that the backsheet does not degrade over the life of the module," said Ron Partridge, senior business...