Rectangle Stock Polycarbonate Standard Plastic Length 4 ft Plastic Width 4 in Plastic Thickness 0.25 in Clear Plastic Clarity Clear Tensile Strength 9 700 psi Impact Strength 14.0 ft-lb/in Friction Coefficient 0.53 Water Absorption 0.13 Percent Plastic Density 0.043 lb/cu in Corrosion and Chemical Resistance Fair