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Torlon® PAI PolyAmide-Imide
Bearing Grade 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 Bearing Grade PAI | Duratron T PAI Grades

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click to resize photo 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).

Depending upon the method used to produce a stock shape (sheet, rod, or tube), the properties of the resulting material can vary. Generally speaking, the best mechanical properties are exhibited by injection molded material. However, the process used is generally defined by the size and shape of the desired material. For example, small diameter rod and thin sheets are extruded -- larger shapes are compression molded. See the following descriptions and properties table for details.


Torlon 4301 PAI (Extruded)

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.

Extruded Torlon ® 4301 is typically only available in thin sheets and small diameter rods. Check with us for availability of 4301 in the size you need. (see also Duratron T4301 PAI)

Torlon 4501 PAI (Compression Molded)

Torlon ® 4501 compression molded PAI is the same formulation as 4301, but has been made into stock shapes using a different manufacturing process. The resulting material is similar to 4301, but has slightly different mechanical properties (see datasheet below).

Compression-molded Torlon ® 4501 is typically available only in larger diameter rods (in short lengths), thicker sheets, and large (but short length) tubes. Check with us for availability of 4501 in the size you need. (see also Duratron T4501 PAI)

see also datasheets for:
Torlon Overview | Bearing Grade Torlon | Torlon Electrical Grades | Torlon Glass-Filled Grades | Carbon-Reinforced Torlon
Duratron T Bearing Grade PAI

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ASTM or UL test Property Torlon® 4301
Bearing Grade
Torlon® 4501
Bearing Grade
Compression Molded
D792 Density (lb/in³)
D570 Water Absorption, 24 hrs (%) 0.40 0.30
D638 Tensile Strength (psi) 12,000 10,000
D638 Tensile Modulus (psi) 900,000 440,000
D638 Tensile Elongation at Break (%) 3 3
D790 Flexural Strength (psi) 23,000 20,000
D790 Flexural Modulus (psi) 800,000 650,000
D695 Compressive Strength (psi) 22,000 16,000
D695 Compressive Modulus (psi) 950,000 359,000
D785 Hardness, Rockwell E70(M106) E70(M106)
D256 IZOD Notched Impact (ft-lb/in) 0.8 0.5
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
1.4 2.0
D648 Heat Deflection Temp (°F / °C)
at 264 psi

534 / 279

534 / 279
D3418 Glass Transition Temp (°F / °C) 527 / 275 527 / 275
- Max Operating Temp (°F / °C) 500 / 260 500 / 260
C177 Thermal Conductivity
(x 10-4 cal/cm-sec-°C)


UL94 Flammability Rating V-0 V-0
D149 Dielectric Strength (V/mil) short time, 1/8" thick - -
D150 Dielectric Constant at 1 MHz 5.40 5.40
D150 Dissipation Factor at 1 MHz 0.042 0.042
D257 Volume Resistivity (ohm-cm)at 50% RH > 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.
DURATRON is a registered trademark of Quadrant Engineering Plastic Products.
TORLON is a registered trademark of Solvay Advanced Polymers.

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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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