POM Delrin Homopolymer: Low-Friction High-Stiffness Engineering Plastic for Precision Gears
Published: 2026-06-04
POM (polyoxymethylene) homopolymer, best known as DuPont Delrin, is the standard material for precision gears, bearings, conveyor chain links, and automotive fuel system components. Its combination of high stiffness, exceptionally low friction...
POM (polyoxymethylene) homopolymer, best known as DuPont Delrin, is the standard material for precision gears, bearings, conveyor chain links, and automotive fuel system components. Its combination of high stiffness, exceptionally low friction (coefficient 0.2-0.3 against steel), excellent fatigue resistance (highest of any unfilled thermoplastic), and good dimensional stability make it the default choice for small mechanical components.
Technical Properties
| Density | 1.41 g/cm³ |
|---|---|
| Tensile Strength | 70 MPa |
| Melting Point | 178 °C |
| Shrinkage Rate | 1.8-2.5% |
| Flexural Modulus | 3.0 GPa |
| Hdt | 95 °C at 1.82 MPa |
| Continuous Service Temp | 90 °C |
Engineering Tool: Shrinkage & Cost Estimator
Calculate part weight, mold cavity dimensions accounting for shrinkage, and material cost — all locally in your browser.
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| DuPont Delrin 500P | |
| Celanese Hostaform C9021 | |
| BASF Ultraform N2320 |
Frequently Asked Questions
What is the difference between POM homopolymer and copolymer?
Homopolymer (Delrin) offers ~10% higher tensile strength and stiffness but slightly lower chemical resistance (particularly to hot water and strong bases). Copolymer (Celcon, Hostaform) has better long-term thermal stability and chemical resistance. For precision gears in dry environments, homopolymer is preferred. For plumbing or chemical exposure, copolymer is the safer choice.
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References & Industry Standards
- ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
- UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
- MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
- ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org