Acetal homopolymer, also known as polyoxymethylene POM, is a plastic resin that’s fashioned into rods to replace metal parts and materials. These rods are strong, stiff, and do not swell. They have a wide operating temperature range (-40°C to 120°C). Acetal homopolymer, of which Delrin is a common brand name, has excellent stability in high-precision molding applications