What is Acetal Plastic? (Polyoxymethylene)

Acetal (POM) is a commonly used engineering plastic that has very good strength and rigidity. Acetal offers very good thermal stability, low moisture absorption, and a hard surface that make it a great choice for tight tolerance machined parts. The material is FDA, USDA, and 3-A Dairy compliant, and has very good performance in wet environments.

Acetal is available in two basic formulations: Homopolymer and Copolymer. The Homopolymer formulation has slightly higher strength, rigidity, and hardness; the Copolymer version has better chemical and hot water resistance, and is porosity free. Both formulations can be produced utilizing Extrusion or Injection Molding methods. A variety of fillers can also be used to enhance the performance.

Homopolymer Acetal (Delrin®) Unfilled – Higher strength and rigidity

Copolymer Acetal – Unfilled, better chemical resistance, no centerline porosity

Glass Filled – Homopolymer with 20% Glass Fiber reinforcement

Delrin® AF – Homopolymer with PTFE Fiber reinforcement

Delrin® AF DE588 – Homopolymer with PTFE Fiber reinforcement for Defense applications

Semitron® Esd 225 – Electrostatic Dissipative

Tecaform® AH ELS – Electro Conductive