Selecting the right plastic material for CNC machining is one of the most critical decisions in any manufacturing project. The wrong choice can lead to part failure, excessive costs, or production delays. This guide walks you through the key factors to consider and how to match materials to your application requirements.
Key Factors When Choosing Plastic for CNC Machining
- Mechanical Properties: Tensile strength, impact resistance, hardness
- Thermal Performance: Maximum service temperature, thermal expansion
- Chemical Resistance: Exposure to solvents, acids, cleaning agents
- Dimensional Stability: Tolerance requirements, moisture absorption
- Cost & Availability: Material cost, lead time, minimum order quantity
Plastic Material Comparison for CNC Machining
| Material | Strength | Max Temp | Cost | Best For |
|---|---|---|---|---|
| PEEK | High | 260°C | $$$$$ | Medical, Aerospace |
| PTFE | Medium | 260°C | $$$ | Chemical, Food |
| POM (Delrin) | High | 100°C | $$ | Gears, Bearings |
| Nylon | High | 120°C | $ | General Mechanical |
| Acrylic (PMMA) | Medium | 80°C | $ | Optical, Display |
| PBI | Very High | 340°C | $$$$$ | Extreme Environments |
Application-Based Material Selection
For in-depth guides: PEEK Machining | PTFE Machining | POM Machining | PBI Machining
Medical & Surgical Components
Choose PEEK or PPSU for biocompatibility, repeated sterilization resistance, and Class VI certification compliance.
Semiconductor & Electronics
PEEK, PTFE, and PCTFE offer chemical resistance and low outgassing for wafer handling and test sockets.
Food Processing Equipment
PTFE, UHMWPE, and PSU meet FDA requirements for food contact and easy cleanability.
Get Expert Material Selection Advice
Not sure which material fits your application? Our engineers provide free material selection support. Request a quote with your drawing and requirements — we respond within 24 hours.
ISO 9001 certified. PEEK, PTFE, POM, and 30+ engineering plastics available.