Engineering Plastics Overview
Engineering plastics provide a lightweight, corrosion-resistant and cost-effective alternative to metal. CNC machining and injection molding work with a broad range of plastics for prototypes and production.
Properties & Benefits
- Lightweight — much lighter than metals.
- Corrosion Resistant — immune to rust and many chemicals.
- Cost-Effective — economical in high volumes.
- Insulating — electrical and thermal insulation.
Common Materials
| Material | Characteristics | Typical Use |
|---|---|---|
| ABS | Tough, low cost | Housings, enclosures |
| PC | Impact resistant, transparent | Covers, lenses |
| POM (Delrin) | Low friction, stiff | Gears, bushings |
| Nylon (PA66) | Wear resistant | Gears, bearings |
| PEEK | High temperature, strong | Medical, aerospace |
Machining Processes
Plastics are machined by CNC milling and turning, and mass-produced by injection molding. Tolerances of ±0.05–0.1mm are typical for machined plastic parts.
Applications
Plastic parts are found in consumer electronics, medical devices, automotive interiors, food-grade components and general industrial products.
Frequently Asked Questions
Which plastic is best for gears?
POM (Delrin) and Nylon offer low friction and wear resistance, making them ideal for gears and bearings.
Can plastics be machined to tight tolerances?
Yes, engineering plastics hold ±0.05–0.1mm, with tighter tolerances possible for stable materials.
What is the strongest plastic?
PEEK is among the strongest and most heat-resistant engineering plastics.
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