How to Bond Acetal? Achieve success bonding Acetal
What is Acetal (POM – Polyoxymethylene)? Acetal is a popular thermoplastic, therefore its use spans a number of industries. Generally, acetal has a high surface slip lubricity which can make it difficult to bond acetal. This plastic is fairly low cost and has good structural properties, consequently, it is often used instead of metal. POM is very high strength, with good impact resistance, low rate of water absorption, good chemical resistance (even against solvents), high dielectric strength and good flame resistance.
How to Bond Acetal?
Permabond polyolefin primer used in conjunction with cyanoacrylate adhesives offer the best strength.
Due to the high-temperature resistance of acetal, epoxies such as Permabond ES5748 can be considered. To bond acetal, cure the ES5748 at the low-temperature end of the cure schedule.
Another option is 2 part polyurethanes. Two-component polyurethanes offer some degree of adhesion to acetal so they may be considered for limited stress joints or potting.
To determine the best specific adhesive to bond acetal in your application, please provide some detail to our technical team and we will get back to you with a recommendation.
Or the following charts might help choose the best type of product. Does your application require solvent or temperature resistance?
Note: Products can withstand higher temperatures for brief periods providing the joint is not unduly stressed.
Tips for surface preparation:
1. Grit blast, wire wool, red Scotch-Brite or grit paper or emery cloth can be used to help provide better adhesive keying.
2. Solvent wipe with Isopropanol or Permabond Cleaner A.
3. Permabond POP Primer in a combination with Permabond
cyanoacrylate adhesive have shown the best bonding results on acetal.
Acetal is available in a number of different blends such as:
- Glass filled
- PTFE filled for improved slip properties (low friction)
- Toughened, abrasion resistant
- UV stabilized, pigmented
- Surface energy: 36 mJ/m² (= difficult to bond)
- Maximum service temperature: 100°C
- Softening temperature: 160°C
- Cogs, gears, plastic bearings
- Conveyor rollers
- Seat belt restraints
- Motor and pump housings
- Pipe fittings
- Ski bindings
IUPITAL®is a registered trademark of Mitsubishi.
CELCON® is a registered trademark of Ticona Corporation.
ULTRAFORM® is a registered trademark of BASF.
KOCETAL® is a registered trademark of Kolon.