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Torlon® 4203 Electrical Grade
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!

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click to resize photo Torlon ® 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 Torlon ® 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).

Torlon 4203 PAI (Extruded)

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.

Torlon ® 4203 extruded PAI is the same formulation as compression molded Torlon 4503 PAI, but has been made into stock shapes using a different manufacturing process. The resulting material is similar to 4503, but has slightly different mechanical properties. See Torlon 4503 Compression Molded PAI datasheet for comparison, or these two electrical grades side-by-side here.

Extruded Torlon ® 4203 is typically only available in thin sheets and small diameter rods. Check with us for availability of 4203 in the size you need. (see also Duratron T4203 PAI)

see also datasheets for:
Torlon | Electrical Grade Torlon | Bearing Grade Torlon | Glass-Filled Torlon | Carbon-Filled Torlon

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ASTM or UL test Property Torlon® 4203
D792 Density (lb/in³)
D570 Water Absorption, 24 hrs (%) 0.4
D570 Water Absorption, Saturation (%) 1.7
D638 Tensile Strength (psi) 20,000
D638 Tensile Modulus (psi) 600,000
D638 Tensile Elongation at Break (%) 10
D790 Flexural Strength (psi) 24,000
D790 Flexural Modulus (psi) 600,000
D732 Shear Strength (psi) 24,000
D695 Compressive Strength (psi) 24,000
D695 Compressive Modulus (psi) 478,000
D785 Hardness, Rockwell E80(M120)
D256 IZOD Notched Impact (ft-lb/in) 2.0
PTM 55007 Coefficient of Friction (Dry vs. Steel) Dynamic 0.35
PTM 55007 Limiting PV (4:1 Safety Factor) (ft-lb-in2-min 12,500
PTM 55010 Wear Factor "k" x 10-10(in3-min/ft-lb-hr 50
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
D648 Heat Deflection Temp (°F / °C)
at 264 psi

532 / 278
D3418 Glass Transition Temp (°F / °C) 527 / 275
- Max Operating Temp (°F / °C) 500 / 260
C177 Thermal Conductivity
(x 10-4 cal/cm-sec-°C)

UL94 Flammability Rating V-0
D149 Dielectric Strength (V/mil) short time, 1/8" thick 580
D150 Dielectric Constant at 1 MHz 4.2
D150 Dissipation Factor at 1 MHz 0.026
EOS/ESD S11.11 Surface Resistivity (ohms/square) > 1016

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 SABIC Advanced Polmers (formerly GE Plastics)

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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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