Delrin®/Acetal is a widely used mechanical thermoplastic. It offers a unique combination of cost effective properties such as:

• Excellent moisture resistance.

• Excellent dimensional stability

• Very good rigidity & mechanical strength

• Low coefficient of friction

• FDA/USDA/NSF compliant

• Continuous use temperature of 180ºF

Acetal is white in its natural color which makes it ideal in food related applications. It is also available in black. There are 2 basic types of acetal: HOMOPOLYMER and COPOLYMER.


Homopolymer is best known by the trade name Delrin®. It has slightly better mechanical and thermal properties than the copolymer. It is available in the following grades:

Glass-Filled– This increases the stiffness, mechanical properties, and dimensional stability of unfilled acetal.

Delrin AF– This is PTFE (Teflon) filled Delrin. It has better lubricity, a lower coefficient of friction, and better wear resistance. The blend can range from 10% to 20% teflon.

Copolymer has been known in the past by the trade name Celcon® but more recently by the name Ultraform ®. It sacrifices some thermal and mechanical properties when compared to the homopolymer, but carries an important advantage. Copolymer does not exhibit any “center line porosity” that is common in the homopolymer.

Delrin & Acetal