Saint-Gobain M855 polyester films have excellent dimensional stability, high tensile, tear and impact strengths and ultimate elongation up to 120% of its original dimensions. These films exhibit low water absorption and good resistance to oils, greases, strong acids and organic solvents. - Rubber adhesive is specially formulated to use as a flash mask protection tape in metal or composite bonding. They also retain electrical properties, dielectric strength and dielectric constant in continuous operating temperatures from -18 to 177 °C.