Commonly known as acetal copolymer, this material is the easiest to machine , wear-resistant, and moisture-resistant. This Product is Manufactured in China. Thickness: 1/2"; Thickness Tolerance: (-0.028" - +0.012"); Width: 1/2"; Width Tolerance: (-0.05" - +0.05"); Length: 12"; Length Tolerance: (-1" - +1"). Color: Black; Clarity: Opaque; Tensile Strength: 9,100 psi; Tensile Strength Rating: Good; Impact Strength: 1.1 ft. - lbs./in.; Impact Strength Rating: Poor. Coefficient of Fricton: 0.35; Friction Rating: Slippery; Water Absorption: 0.0022; Water Absorption Rating: Good; Hardness: Rockwell M90. Density: 0.051 lbs / cu. in.; Temperature Range: -50° to 180° F; Specifications Met: UL 94 HB.