Plastic Sheet Polystyrene Grade Standard Plastic Length 12 in Plastic Width 12 in Plastic Thickness 0.25 in White Plastic Clarity Opaque Tensile Strength 2 500 psi Impact Strength 0.2 ft-lb/in Friction Coefficient 0.5 Water Absorption 0.3 Percent Temperature Range 0 Degrees to 150 Degrees F Plastic Density 0.038 lb/cu in Plastic Hardness Rockwell R70