Plastic-Craft Products|Material Guide
What Is Torlon? The Strongest Thermoplastic for Extreme Conditions
When PEEK isn’t enough — when sustained loads, temperatures, or chemical environments exceed what even the gold standard can deliver — engineers reach for Torlon. The highest-performing melt-processable thermoplastic available.
Published March 2026·Gabrielle Holliday
Certified ISO 9001:2015 AS9100:2016 Post-Cure Expertise
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What Is Torlon?
Torlon is Solvay’s trade name for polyamide-imide (PAI) — a high-performance thermoplastic with both amide and imide linkages in its backbone. The imide groups provide thermal stability and chemical resistance; the amide linkages provide toughness and processability that pure polyimides lack.
Critical: Torlon requires a post-cure process after machining. Parts must be thermally cured in a controlled oven cycle (~500°F) before full mechanical and thermal properties are achieved. This step is not optional — skipping it produces parts that haven’t reached their rated performance.
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Properties That Exceed PEEK
Continuous service temperature: Torlon 4301 at 500°F (260°C) — exceeding PEEK’s 480°F.
Compressive strength: Significantly higher than PEEK. The correct specification for bearing and wear components under extreme sustained loads.
Creep resistance: Exceptional under sustained load at elevated temperatures — the defining requirement for precision bearings in jet engines, turbines, and high-temperature machinery.
Wear resistance: Bearing grades (4435, 4540) with internal lubricants outperform bearing-grade PEEK in high-load, high-temperature sliding.
Chemical resistance: Resistant to fuels, hydraulic fluids, lubricants, and high-temperature process chemicals — broader than PEEK in many aerospace-relevant categories.
Cost: Substantially higher than PEEK. Specify only when the application genuinely exceeds what PEEK can deliver.
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Applications
✈️Aerospace Engine Components
🛢️Oil & Gas Downhole
💾Semiconductor Processing
🔄Industrial Compressors
🛡️Military & Defense
⚙️High-Speed Rotating Equipment
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Torlon Grades
Torlon 4301 (Unfilled)
Standard structural grade for chemical resistance and general high-temperature applications.
Torlon 4203 (Glass/Carbon Filled)
Maximum stiffness and compressive strength for structural components under extreme loads.
Torlon 4435 (Graphite/PTFE)
Reduced friction for sliding and rotating contact applications.
Torlon 4540 (Carbon/Graphite)
Highest wear resistance for high-PV bearing applications.
FAQ
Frequently Asked Questions
Is Torlon stronger than PEEK?
Yes — higher compressive strength, better creep resistance at elevated temperatures, and a continuous service temperature that matches or exceeds PEEK. PEEK offers broader chemical resistance and wider availability. Torlon is specified when PEEK genuinely isn’t enough.
Why does Torlon require post-cure?
Torlon stock is supplied partially cured for machinability. Full properties are only achieved after a controlled thermal post-cure cycle. Without it, parts won’t meet rated values and will continue curing — and changing dimensions — in service.
What temperature can Torlon withstand?
Torlon 4301 at 500°F (260°C) continuous — one of the highest-rated melt-processable thermoplastics available. Assumes fully post-cured parts.
Where can I buy Torlon?
Plastic-Craft Products stocks Torlon rod and sheet in standard and bearing grades at West Nyack, NY. No minimum orders. Call (845) 358-3010 or email ecom@plastic-craft.com.
Ready to Order Torlon?
Plastic-Craft stocks Torlon PAI in multiple grades — cut to exact dimensions or machined to print with no minimum orders, in-house CNC machining, and post-cure expertise.
(845) 358-3010