Torlon 4203 PAI
Polyamide-imide
The highest-performance machinable thermoplastic in this catalog, for extreme conditions.
Torlon polyamide-imide holds mechanical strength at temperatures and loads that push most other engineering plastics past their limits, at a materially higher cost that reflects both the resin and the difficulty of processing it.
Specs
- Density
- 0.0513 lb/in³
- Stock thicknesses
- 0.25, 0.5, 0.75, 1 in
- Sheet size
- 24 x 12 in
- Brands available
- Solvay Torlon 4203
Price depends on size, quantity, tolerance and finish - get an exact number for this material in seconds.
Handling notice
- Torlon 4203 PAI carries residual stress from how the plate was made. Cutting it free lets that stress release, and a 12x12 blank can bow 0.010-0.025 in within 48 hours. Stress-relief annealing is available at quote time.
Why this material
Reach for Torlon only when PEEK's performance genuinely isn't enough - the cost difference is significant, and most applications that seem to need Torlon are well served by PEEK or PPS at lower cost.
Typical applications
- Bearings and bushings in extreme-temperature or high-load service
- Aerospace structural components under sustained stress
- Downhole and industrial components facing combined heat and load
- Precision parts requiring the highest strength-to-weight of any machinable plastic
Questions
Why is Torlon so much more expensive than PEEK?
Torlon's raw resin cost and the difficulty of machining it to spec both run higher than PEEK's - it's genuinely a step up in both performance and price, not a marketing distinction.
Does Torlon need post-cure or annealing?
Torlon parts are often post-cured by the material manufacturer before shipment for maximum properties; check your specific application against the mill's technical data sheet.
What's the biggest reason to choose Torlon over PEEK?
Sustained performance at combined high temperature and high mechanical load, where PEEK's properties begin to degrade meaningfully faster.