What is the best adhesive for bonding Acetal?

Acetal (Polyoxymethylene) is a strong and rigid thermoplastic that has good moisture, heat and chemical resistance. It is commonly used in industries as a replacement for metals, due to its lightweight, low cost and good structural properties.

The two basic types of acetal resins are Acetal Copolymer (Celcon®), and Acetal Homopolymer (Delrin®). Acetal Homopolymer offers high impact resistance, stiffness and creep resistance. Acetal Copolymers provide good resistance to moisture and chemicals.

Acetal plastics can be found in the transportation, electronic, medical and general industries. Typical applications include pumps and valves, washers, cogs, gears, electrical components and insulation, plastic bearings and conveyor rollers.

Acetal can be modified by using additives such as PTFE for improved slip properties. Other grades of acetal include glass filled offering enhanced strength and stiffness, UV stabilised, anti-static and conductive.

Main Acetal properties

– Surface energy: 36mJ/m²

– Maximum service temperature: 100°C

– Melting temperature: 160°C

Adhesives for bonding Acetal 

Acetal plastics can be difficult to bond because of their low surface energy.

Cyanoacrylate adhesives can be used with Permabond POP Primer to achieve high strength bonds. Permabond 731, a toughened cyanoacrylate can be used for extra toughness, impact and temperature resistance.

Epoxy adhesives such as Araldite 2011, a two component epoxy adhesive can be used to bond acetal. The adhesive has good resistance to chemicals and resistance to dynamic loading.

Surface preparation tips for Acetal

When bonding acetal to dissimilar materials such as metals, the material may need to be abraded to improve the adhesive bond strength.

1. Lightly abrade the surface using either grit blasting, a wire wool, grit paper or an emery cloth.

2. Surfaces can be cleaned with a solvent wipe or Permabond Cleaner A before applying Permabond POP and the cyanoacrylate adhesive.

Contact us for more detailed product recommendations on bonding Acetal 

Looking for tips on bonding other plastics, read: What you need to know on bonding plastics

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