Acetal | Roncelli Plastics

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.

What are the Benefits of using Acetal?

Good Strength and Rigidity
Very good Dimensional Stability
Excellent machinability
Good wear resistance when wet
Moderate chemical resistance
FDA, USDA, 3-A Dairy Compliant

What are Typical Applications of Acetal?

Bushings Slide Pads

Back-Up Rings Valve Seats

Gears Sprockets

Guides Locators

Spacers Thrust Washers

Manifolds Nozzles

Insulators Fixtures

Pistons Rollers

Acetal Formulations:

Access Data Sheet

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

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