Aerolam Premium METPET PE consists two layers of fire retardant air bubble film laminated with one side metalized foil and Poly film on another side. This double bubble insulation material reflects 97 % of radiant heat. Roll Size (W X L) 1.2m X 40m Bubble Size 4MM X 10 MM Nominal Thickness (MM) 8 MM Reflection Ratio 97% Thermal Resistance Emissivity 0.03-0.04 Temperature Range -122 ? to 230 ?(-50°C ? 110 °C) Usage This double bubble insulation use for industrial, manufacturing and consumer applications.