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Torlon® Sheet & Rod
PAI PolyAmide-Imide Specifications

904 West 6th Street, Shiner, Texas 77984 USA
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail:


BPI Home Page | Applications | Materials Guide | Contact Us!
Torlon Overview | Electrical Grade Torlon | Bearing Grade Torlon | Glass-Reinforced Torlon | Carbon-Reinforced Torlon
Duratron T PAI Semitron ESd 520HR Static-Dissipative Torlon PAI

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click to resize photo Torlon ® is a high performance amorphous (non-crystalline) engineering thermoplastic. Chemically, Torlon ® is a polyamide-imide (PAI), a reaction product of trimellitic anhydride and aromatic diamines. It is called amide-imide because the polymer chain comprises amide linkages alternative with imide linkages. The combination of aromatic groups and imide linkages are responsible for the polymer's exceptional thermal stability. The amide groups impart flexibility and elongation, which results in an engineering plastic with exceptional toughness.

Torlon ® is the highest performing melt processable plastic. It has superior resistance to elevated temperatures. It is capable of performing under severe stress conditions at continuous temperatures to 500°F (260°C). Parts machined from Torlon ® stock shapes provide greater compressive strength and higher impact resistance than most advanced engineering plastics. Its extremely low coefficient of linear thermal expansion and high creep resistance deliver excellent dimensional stability over its entire use range. Torlon ® is an amorphous material with a Tg (glass transition temperature) of 537°F (280°C).

Torlon 4203 (Electrical Grade)
Torlon ® 4203 extruded PAI offers excellent compressive strength and the highest elongation of the Torlon ® grades. It also provides electrical insulation and exceptional impact strength. This grade is commonly used for electrical connectors and insulators due to its high dielectric strength. (see also Duratron T4203 PAI)

Torlon 4301 (Bearing Grade)
Torlon ® 4301 extruded PAI is primarily used for wear and friction parts. It offers a very low expansion rate, low coefficient of friction and exhibits little or no slip-stick in use. Torlon ® 4301's flexural modulus of 1,000,000 psi is higher than most other advanced engineering plastics. This grade excels in severe service wear applications such as non- lubricated bearings, seals, bearing cages and reciprocating compressor parts. (see also Duratron T4301 PAI)

Torlon 5530 (Glass-Reinforced Grade)
Torlon ® 5530 is 30% glass reinforced, compression molded PAI. It is ideal for higher load structural or electronic applications. This grade is similar in composition to Torlon ® 5030 PAI (injection molded). It is selected for larger shapes or when the greatest degree of dimensional control is required. Applications include burn-in sockets, gears, valve plates, impellers, rotors, terminal strips, and insulators. (see also Duratron T5530 PAI)

see also our E X P A N D E D datasheets for:
Torlon Electrical Grades | Torlon Bearing Grades | Torlon Glass-Reinforced Grades | Torlon Carbon-Reinforced Grades
Duratron T PAI | Semitron ESd 520 Static-Dissipative Torlon PAI

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ASTM or UL test Property Torlon® 4203
Elect. Grade
Torlon® 4301
Bearing Grade
Torlon® 5530
D792 Density (lb/in³)
D570 Water Absorption, 24 hrs (%) 0.4 0.4 0.3
D638 Tensile Strength (psi) 18,000 12,000 15,000
D638 Tensile Modulus (psi) 600,000 800,000 900,000
D638 Tensile Elongation at Break (%) 10 3 3
D790 Flexural Strength (psi) 24,000 23,000 20,000
D790 Flexural Modulus (psi) 600,000 800,000 900,000
D695 Compressive Strength (psi) 24,000 22,000 27,000
D695 Compressive Modulus (psi) 700,000 950,000 600,000
D785 Hardness, Rockwell E80(M120) E70(M106) E85(M125)
D256 IZOD Notched Impact (ft-lb/in) 2.0 0.8 0.7
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
1.7 1.4 2.6
D648 Heat Deflection Temp (°F / °C)
at 264 psi

532 / 278

534 / 279

520 / 271
D3418 Glass Transition Temp (°F / °C) 527 / 275 527 / 275 527 / 275
- Max Operating Temp (°F / °C) 500 / 260 500 / 260 500 / 260
C177 Thermal Conductivity
(x 10-4 cal/cm-sec-°C)



UL94 Flammability Rating V-0 V-0 V-0
D149 Dielectric Strength (V/mil) short time, 1/8" thick 580 - 700
D150 Dielectric Constant at 1 MHz 4.2 6.0 6.3
D150 Dissipation Factor at 1 MHz 0.026 0.037 0.022
D257 Volume Resistivity (ohm-cm)at 50% RH > 1016 > 1013 > 1013

NOTE: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets.
All values at 73°F (23°C) unless otherwise noted.
TORLON is a registered trademark of Solvay Advanced Polymers.
DURATRON is a registered trademark of Quadrant Engineering Plastic Products.

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Boedeker Plastics, Inc.
904 West 6th Street, Shiner, Texas 77984 USA
USA TOLLFREE : 1-800-444-3485
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail:

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