Glass-filled nylon (PA12-GF) adds stiffness, heat resistance, and dimensional stability at lower cost; carbon-fibre nylon (PA12-CF) is lighter and stiffer with a premium finish. Both beat unfilled PA12 for structural parts — choose GF for cost-effective rigidity and CF for the best strength-to-weight. Here is the comparison.
Key Takeaways
- PA12-GF — glass fibres add stiffness, heat resistance, and stability affordably; heavier, abrasive.
- PA12-CF — carbon fibres give the best stiffness-to-weight and a premium matte-black look; costs more.
- Both reduce warping and improve dimensional stability vs plain PA12.
- Fibres are abrasive — professional hardened-nozzle printing recommended.
- Use GF for brackets and housings; CF for lightweight structural and motorsport parts.
How do glass and carbon nylon differ?
| Property | PA12 (unfilled) | PA12-GF | PA12-CF |
|---|---|---|---|
| Stiffness | Medium | High | Very high |
| Weight | Low | Higher | Low |
| Heat resistance | Good | Better | Better |
| Cost | Low | Medium | High |
| Best for | Functional parts | Stiff brackets/housings | Lightweight structural |
Which should you choose?
Choose PA12-GF when you need rigidity and heat resistance without paying for carbon — housings, brackets, and fixtures where weight is not critical. Choose PA12-CF when weight matters and you want maximum stiffness — drones, motorsport, robotics arms, and premium structural parts. For the carbon-vs-unfilled angle, see PA12 vs PA12-CF.
Frequently Asked Questions
Are filled nylons stronger in all directions?
Fibres align with print/flow direction, so parts can be anisotropic — orientation matters. We optimise it during DFM.
Which is better for drones?
PA12-CF — lightest and stiffest. See our carbon-fibre guide. Get a quote.