Polyester Sheet Material Polyurethane Shape Sheet Grade Military Specification Length 4 1/2 ft Width 4 ft Thickness 1/2 in Backing Type Adhesive Cell Type Open Cell Number of Adhesive Sides 1 Color Gray Density 2 lb/cu ft Maximum Temperature 180 Degrees F Minimum Temperature -20 Degrees F Maximum Adhesive Temperature 180 Degrees F Minimum Adhesive Temperature -20 Degrees F Tensile Strength 18 psi Texture Smooth Firmness @ 25 Percent Deflection 0.55 to 0.74 psi