POM-H (Acetal Homopolymer)
Polyoxymethylene Homopolymer — slightly stronger and stiffer than POM-C copolymer but with centerline porosity in stock shapes and lower resistance to hot water/alkalis. Trade names include Delrin (DuPont/DuPont de Nemours) and Tenac (Asahi Kasei). Used for gears, cams, springs, clips, fuel system components, and precision-machined parts where maximum stiffness is needed.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| ISO | INT | POM-H | — | REF | |
| 🇺🇸 | ASTM | USA | ASTM D6100 (acetal homopolymer) | — | 100% |
| 🇺🇸 | TRADE | USA | Delrin (DuPont) | — | 95% |
Sources: ISO 9988, ASTM D6100, DuPont TDS
Chemical composition comparison (wt%)
Side-by-side: POM-H (Acetal Homopolymer) (COMPOSITION) (ISO 9988) vs Delrin (DuPont) (TRADE)
| Element | POM-H (Acetal Homopolymer) (COMPOSITION) | Delrin (DuPont) (TRADE) | Overlap |
|---|---|---|---|
| Polyoxymethylene (OCH2 homopolymer) | 99–99.9% | — | — |
Mechanical properties
Injection Molded
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 66–73 | MPa |
| Yield Strength | 65–70 | MPa |
| Elongation | 15–25 | % |
| Elastic Modulus | 3–3.5 | GPa |
| Density | ≥ 1.42 | g/cm3 |
| Melting Point | ≥ 175 | °C |
| Water Absorption (24h) | 0.2–0.25 | % |
| Continuous Use Temp | 90–105 | °C |
Compatibility verdict
POM-H (Acetal Homopolymer) and Delrin (DuPont): 95% composition match
Close equivalents but NOT identical.
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