Torlon PAI vs Celazole PBI: Ultra-High Temperature Face-Off
Published: 2026-06-02
PAI and PBI: two highest-temperature melt-processable thermoplastics. PBI has highest Tg of any commercial polymer (427°C). Requires 7+ day post-cure, costs ~$1,500-2,000/kg. PAI: Tg 275°C, $80-120/kg, simpler post-cure (3-7 days). For most...
PAI and PBI: two highest-temperature melt-processable thermoplastics. PBI has highest Tg of any commercial polymer (427°C). Requires 7+ day post-cure, costs ~$1,500-2,000/kg. PAI: Tg 275°C, $80-120/kg, simpler post-cure (3-7 days). For most applications below 260°C: PAI. PBI only where PAI cannot survive thermally.
Comparison at a Glance
| Tensile Strength | PAI: 150 vs PBI: 160 MPa |
|---|---|
| Melting Point | PAI: Tg 275 vs PBI: Tg 427°C |
| Shrinkage Rate | PAI: 0.6 vs PBI: 2-3% |
| Flexural Modulus | PAI: 5.0 vs PBI: 6.5 GPa |
| Hdt | PAI: 280 vs PBI: 435°C |
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| Torlon 4203 vs Celazole PBI |
Frequently Asked Questions
Why PBI costs 10-15× more?
Monomer (tetraaminobiphenyl) requires multi-step inert-atmosphere synthesis. Polymerization in polyphosphoric acid at 200°C. Post-cure: 7-14 days. PAI uses simpler chemistry with 3-7 day post-cure.
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References & Industry Standards
- ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
- UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
- MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
- ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org