TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The additive is present at a level of greater than or equal to 10 wt.%. The additive comprises TiO2.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymeric layer comprises is polyolefin; or fluoropolymer. The fluoropolymer comprises polymerized units selected from vinylfluoride, vinylidenefluoride, and/or tetrafluoroethylene and optionally other fully fluorinated, partially fluorinated or non-fluorinated monomers (preferably polyvinylfluoride, polyvinylidene fluoride, ethylene-co-tetrafluoroethylene polymers, or copolymers of tetrafluoroethylene, hexafluoropropylene or vinylidene fluoride). In the solar panel, the solar panel backside film is treated to address adherence to the polymer. Preferred Film: In the solar panel backside film, a layer providing UV protection is applied to the outside facing surface of the solar panel backside film on a side opposing the polymeric layer. The adhesion of the polyethylene terephthalate film to the polymeric layer is at least 1 pound per linear inch after 2000 hours of exposure to 85 degrees C and 85% relative humidity. The net peak area as measured by differential scanning calorimetry is -7-0 J/g measured from the endpoint of its glass transition up to 230 degrees C. EXAMPLE - PET film was made on a production scale tentering line. The base resin was a polymer of DMT and ethylene glycol with an initial intrinsic viscosity (IV) of 0.59. To which was added 15% of a 0.74 IV, Eastapak 7352 (RTM: PET resin), TiO2 (13%) from a 50% concentrate and 1% of OB-1 (RTM: optical brightener) via a masterbatch. The cast web was pre-heated to within 78-82 degrees C and stretched 3.23:1 in the machine direction. Subsequently, the film was further heated into 97-103 degrees C and then stretched 4.3:1 in the transverse direction during a period of 9 seconds. The heat set zone temperatures were set at an average of 235 degrees C and the residence time was 9 seconds. Upon exiting the heat set zone, the web entered a first cooling zone of 90-100 degrees C followed by a second cooling zone of 40-50 degrees C. The time in each cooling zone was 3 seconds. The resultant film was nominally 3 mils thick and had an opacity of 95% and was exposed to a second brief thermal exposure of 180 degrees C under reduced constraint. The resultant film had shrinkage values of 0.81% in the machine direction and 1.02% in the transverse direction measured at 150 degrees C for 15 minutes. The net peak area as measured by DSC from endpoint of glass transition to 230 degrees C was -5 J/g. This film was subjected to the same damp heat test conditions of 85 degrees C and 85% relative humidity and measured 13.4% at 80 days and 4.4% at 100 days.