Check the listing for details. Delrin / Acetal Copolymer Plastic Sheet Various Sizes and Colors. Condition: New. Listed at 21.48 USD. Delrin / Acetal Copolymer Plastic Sheet Various Sizes and Colors Cut tolerance +0" -0.25" Acetal copolymer (Delrin) sheets provide a naturally slippery surface and superior wear resistance. Since they resist expansion from temperature and moisture, they can be machined to close tolerances. Acetal copolymer is good for gears, bearings, bushings and other projects that require precision.Delrin / Acetal Copolymer Plastic Sheet Various Sizes and Colors Cut tolerance +0" -0.25" Acetal copolymer (Delrin) sheets provide a naturally slippery surface and superior wear resistance. Since they resist expansion from temperature and moisture, they can be machined to close tolerances. Acetal copolymer is good for gears, bearings, bushings and other projects that require precision.