Rectangle Stock, Acetal Copolymer, Standard, Plastic Length 4 ft, Plastic Width 4 in, Plastic Thickness 0.5 in, Black, Plastic Clarity Opaque, Tensile Strength 9,100 psi, Impact Strength 1.1 ft-lb/in, Friction Coefficient 0.35, Water Absorption 0.22 Percent, Plastic Density 0.051 lb/cu in, Corrosion and Chemical Resistance Fair