Delrin is a brand name for acetal homopolymer resin. It is an engineering plastic known for strength, stiffness, and low friction. Industries use Delrin for gears, bearings, housings, and many moving parts. This guide explains Delrin’s basic facts, key properties, processing options, and common applications in simple language.
جدول المحتويات
- 1. Definition of Delrin
- 2. Why Choose Delrin?
- 3. Key Properties of Delrin
- 4. Delrin vs Other Plastics
- 5. Main Grades of Delrin
- 6. Processing Methods
- 7. Design Tips for Delrin Parts
- 8. Industrial Applications
- 9. Care and Maintenance
- 10. How to Source Delrin
- 11. FAQs
- 12. Conclusion
1. Definition of Delrin
Delrin is the trade name for acetal homopolymer made by DuPont (now DuPont-Celanese). Chemically, it is polyoxymethylene (POM). It appears as white or black granules and is molded into strong, precise parts.
2. Why Choose Delrin?
- High stiffness and strength.
- Very low friction and wear.
- Dimensional stability over a wide temperature range.
- Resists many fuels, oils, and chemicals.
- Good fatigue and impact performance.
3. Key Properties of Delrin
The table below lists typical property ranges for unfilled Delrin.
| ملكية | Typical Value | Why It Matters |
|---|---|---|
| قوة الشد | 60–70 MPa | Handles static loads |
| معامل العاطفة | 2.8 GPa | High stiffness |
| استطالة عند الكسر | 20–40 % | صلابة جيدة |
| كثافة | 1.41 g/cm³ | Lighter than metals |
| Operating Temp. | -40 °C to +105 °C | Wide service range |
| Water Absorption (24 h) | <0.3 % | Stable dimensions |
| معامل الاحتكاك | 0.2 (dry vs steel) | Low wear in sliding |
Mini Bar Chart: Relative Stiffness Index
Delrin ██████████ (100 %) Nylon ████████ (80 %) ABS █████ (60 %) HDPE ███ (30 %) Rubber █ (10 %)
The bar chart uses simple text blocks to show how Delrin’s stiffness compares to other common plastics.
4. Delrin vs Other Plastics
| ميزة | Delrin | نايلون 6 | عضلات المعدة | أوهمو-بي |
|---|---|---|---|---|
| امتصاص الرطوبة | قليل | عالي | قليل | Very low |
| Friction Coefficient | Very low | قليل | معتدل | Ultra low |
| القدرة على التصنيع | ممتاز | جيد | عدل | صعب |
| Heat Distortion °C | 100 | 80 | 90 | 70 |
| Relative Cost | واسطة | Low-medium | قليل | عالي |
5. Main Grades of Delrin
| درجة | Filler or Additive | Main Benefit |
|---|---|---|
| ديلرين 100AF | PTFE Lubricant | Ultra-low friction |
| Delrin Glass-Filled | 25 % Glass Fiber | High stiffness |
| Delrin UV-Stabilized | UV Inhibitors | Better outdoor life |
| Delrin FDA | Food-grade | Safe for food contact |
| Delrin Low VOC | Low outgassing | Automotive interiors |
6. Processing Methods
صب الحقن
Most Delrin parts are molded. Melt temperature is 190–215 °C. Mold temperature is 80–100 °C for best surface.
التصنيع باستخدام الحاسب الآلي
Delrin machines like soft metal. Sometime engineer use sharp HSS or carbide tools. Chips break cleanly, reducing dust. In TUOFA China Machining shop, years of machining Delrin parts, would be a better choice to choose from for a project.
Extrusion and Rod Forming
Sheets, rods, and profiles are extruded for later machining or welding.
Welding and Bonding
Hot-gas welding works. Solvent bonding is hard because Delrin resists many chemicals. Mechanical fasteners are common.
7. Design Tips for Delrin Parts
- Add 1–2 % shrinkage allowance for molding.
- Use generous radii (0.5 mm+) to avoid stress cracks.
- For gears, target 0.2–0.3 mm backlash to handle thermal growth.
- Vent molds well to avoid gas traps and burn marks.
8. Industrial Applications
| صناعة | Part Example | Reason for Delrin Choice |
|---|---|---|
| السيارات | Window gear | Low noise, high wear life |
| إلكترونيات | Connector housing | Tight tolerance, dielectric |
| طبي | Insulin pump gear | Chemical resistance, precision |
| Consumer | Knife handle | Grip strength, machinability |
| صناعي | Conveyor roller | Low friction, moisture proof |
9. Care and Maintenance
Delrin resists many chemicals but avoid prolonged contact with strong acids. Clean with mild soap and water. For moving parts, periodic silicone or PTFE lubrication can extend life. Avoid continuous use above 100 °C to prevent creep.
10. How to Source Delrin
- Buy certified resin or sheet from major distributors.
- Check lot certifications for food-grade or medical grades.
- Order sample pieces for prototype tests before large volume runs.
11. FAQs
Is Delrin stronger than nylon?
Delrin is stiffer but nylon is tougher. Choose based on need.
Can Delrin be 3D printed?
Special POM filaments exist, but printing requires a heated chamber.
Is Delrin food safe?
FDA grades are food safe. Confirm certification.
12. Conclusion
Delrin delivers a rare mix of strength, low friction, and chemical resistance in one material. With proper grade selection and design, it serves as a reliable choice for gears, bearings, housings, and many precise parts across industries. When you need stable dimensions, clean machining, and long wear life, Delrin is a smart solution.
