Boedeker Plastics, Inc. Logo -- boedeker plastics supply shiner
     texas tx usa boedeker plastics material supply shiner texas usa plastics
     distributor plastics sales plastics supply plastics machine shop

Duratron® T 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!
Electrical Grade Duratron | Glass-Reinforced Duratron | Carbon-Reinforced Duratron | Other Duratron Products

blue line


click to resize photo Duratron ® T PAI 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 Duratron ® T PAI 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. PAI 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.


Duratron T4301 PAI (Extruded)

Duratron ® T4301 extruded PAI is primarily used for wear and friction parts. This grade contains 12% graphite powder and 3% PTFE for a very low expansion rate, low coefficient of friction and little or no slip-stick in use. This grade excels in severe service wear applications such as non- lubricated bearings, seals, bearing cages and reciprocating compressor parts.

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

Duratron T4501 PAI (Compression Molded)

Duratron ® T4501 compression molded PAI is the same formulation as T4301, but has been made into stock shapes using a different manufacturing process. The resulting material is similar to T4301, but has slightly different mechanical properties (see datasheet below).

Compression-molded Duratron ® T4501 PAI 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 T4501 in the size you need.

Duratron T4275 PAI (Compression Molded)

Duratron ® T4275 compression molded PAI is a wear-resistant grade of polyamide-imide (PAI). With 20% graphite and 3% PTFE fillers, T4275 offers lower friction and increased wear resistance as compared with other Duratron T PAI bearing grades above. This specially-blended grade offers an excellent balance of mechanical properties and wear resistance. It offers high tensile strength and modulus with a low coefficient of friction and outstanding wear resistance at both high velocity and high pressure conditions.

Duratron T4435 PAI (Compression Molded)

Duratron ® T4435 PAI is specifically designed to provide exceptionally low wear performance in non-lubricated applications even at high pressure and velocity (PV) conditions. This specially-blended grade contains a proprietary formula of carbon fiber, graphite, mica and PTFE fillers, It offers the best possible advantages of lower friction and increased wear resistance as compared with other Duratron T PAI bearing grades above. Not only is Duratron T4435 PAI particularly suited to applications where lubrication is impossible or undesirable, it provides an additional margin of safety for lubricated systems in the event that lubrication is lost.

NOTE: Duratron T4275 and T4435 specialty bearing grades above are NOT AVAILABLE FROM STOCK, but rather can be offered ONLY BY SPECIAL ORDER ... long leadtimes and large minimum order quantities may apply when ordering these grades in sheet or rod forms.

For a complete overview of Quadrant's Duratron product family, including other high-performance engineering plastics, see this page.
see also datasheets for:
Torlon | Electrical Grade Torlon | Bearing Grade Torlon | Glass-Filled Torlon | Carbon-Filled Torlon

blue line


ASTM or UL test Property Duratron T4301 PAI
Duratron T4501 PAI
Compression Molded
D792 Density (lb/in³)
D570 Water Absorption, 24 hrs (%) 0.4 0.3
D570 Water Absorption, Saturation (%) 1.5 1.5
D638 Tensile Strength (psi) 15,000 10,000
D638 Tensile Modulus (psi) 900,000 440,000
D638 Tensile Elongation at Break (%) 3.0 3.0
D790 Flexural Strength (psi) 23,000 20,000
D790 Flexural Modulus (psi) 800,000 650,000
D732 Shear Strength (psi) 16,400 -
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
PTM 55007 Coefficient of Friction (Dry vs. Steel) Dynamic 0.20 0.20
PTM 55007 Limiting PV (4:1 Safety Factor) (ft-lb-in2-min 22,500 22,500
PTM 55010 Wear Factor "k" x 10-10(in3-min/ft-lb-hr 10 4.5
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
1.4 2
D648 Heat Deflection Temp (°F / °C)
at 264 psi

534 / 277

534 / 277
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 6.0 6.0
D150 Dissipation Factor at 1 MHz 0.037 0.042
EOS/ESD S11.11 Surface Resistivity (ohms/square) > 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.

blue line

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:

©     Copyright Boedeker Plastics, Inc.