Acetal plastic, also known by the brand name Delrin®, is a mechanical thermoplastic used for precision close-tolerance industrial and mechanical components, featuring high strength and stiffness coupled with enhanced dimensional stability and ease of machining. As a semi-crystalline material, acetal is also characterized by a low coefficient of friction and good wear properties even in extremely cold environments.
Acetal comes in a variety of grades to enhance specific features including static dissipative and PTFE blend grades. General purpose acetal is a copolymer plastic, while Delrin® has a homopolymer makeup.
Copolymer acetal plastic has no center-line porosity and performs better than standard Delrin® at elevated temperatures. It’s available in FDA compliant grades and features slightly increased resistance to chemicals, hot water, and high pH solutions versus Delrin® homopolymer acetal.
Homopolymer Delrin® acetal plastic features a higher crystallinity, providing better mechanical properties including tensile strength, creep resistance and impact strength. Delrin® demonstrates high strength and stiffness in addition to good dimensional stability and very low moisture absorption. Delrin® can operate in wet environments with little effect on performance and may see increased part life. Its natural grade is FDA, NSF and USDA compliant.
|Physical Properties of Acetal & Delrin® Sheet *|
|Water Absorption @24 Hours||0.2%||0.2%|
|Tensile Strength (psi)||9500||11000|
|Tensile Modulus (psi)||400,000||450,000|
|Elongation at Break||30%||30%|
|Flexural Strength (psi)||12000||13000|
|Flexural Modulus (psi)||400,000||450,000|
|Compressive Strength (psi)||15000||16000|
|Dielectric Strength (V/mil)||420||450|
|*The values listed are typical and are meant only as a guide to aid in design. Field testing should be performed to find the actual values for your application.|
Delrin® & Acetal Plastic Features
- Consistent properties in wet or moist environments
- Easy to machine to close tolerances
- High strength and stiffness
- Excellent dimensional stability
- High crystallinity with centerline porosity
- High tensile- and impact strength
- Excellent creep resistance
- Very low moisture absorption
- Excellent electrical properties
- FDA and USDA compliant grades available
Give us a call today for help finding the Delrin®/acetal plastic grade best suited for your application!