Acetal copolymer plastic and Delrin® homopolymer plastic are mechanical thermoplastics 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.
Delrin Sheet / 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 *
Property Acetal Delrin Copolymer Homopolymer
Density (lb/in^3) 0.051 0.051
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
Hardness, Rockwell M88/R120 M89/R122
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!
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Contact Name: Roger Milligan