Torlon® 4203 (Polyamide-imide)
Torlon® 4203 polyamide-imide offers excellent compressive strength and the highest elongation of the Torlon grades. Several manufacturers offer bearing grade versions by the tradenames Duratron® PAI, and Tecator®. It provides electrical insulation and exceptional impact strength. Torlon® 4203 is commonly used for electrical connectors and insulators due to its high dielectric strength. It is also an excellent choice for bearing and wear applications involving impact loading and abrasive environments. Its ability to carry high loads over a broad temperature range makes it ideal for structural components such as linkage bearings and seal rings.
| Specification | Test | Value | Units |
| Specific Gravity, 73°F | D792 | 1.41 | – |
| Tensile Strength @ Yield, 73°F | D638 | 20,000 | psi |
| Tensile Modulus of Elasticity, 73°F | D638 | 600,000 | psi |
| Tensile Elongation (at break), 73°F | D638 | 10 | % |
| Flexural Strength, 73°F | D790 | 24,000 | psi |
| Flexural Modulus of Elasticity | D790 | 600,000 | psi |
| Shear Strength, 73°F | D732 | 16,000 | psi |
| Compressive Strength – Ultimate | psi | ||
| Compressive Strength at 2% Deformation | D695 | psi | |
| Compressive Strength at 10% Deformation | D695 | 24,000 | psi |
| Deformation Under Load | % | ||
| Compressive Modulus of Elasticity, 73°F | D695 | 478,000 | |
| Compressive Strength ⊥ to Laminate (Modulus) | psi | ||
| Compressive Strength ⊥ to Laminate (Yield) | psi | ||
| Compressive Strength ⊥ to Laminate (Ultimate) | psi | ||
| Hardness, Durometer (Shore “D” scale) | D2240 | – | |
| Hardness, Rockwell (Scale as noted) | D785 | E80 (M120) | Rockwell M |
| Izod Impact, Notched @ 73°F | D256 Type A | 2.0 | ft.lbs/in. of notch |
| Coefficient of Friction (Dry vs Steel) Static | PTM55007 | ||
| Coefficient of Friction (Dry vs Steel) Dynamic | PTM55007 | 0.35 | |
| Maximum Static Bearing Load (P) | PTM55007 | psi | |
| Maximum Unlubricated No Load Bearing Velocity (V) | PTM55007 | ft/minute | |
| Maximum Limiting PV (Unlubricated) | PTM55007 | 12,000 | psi x ft/min. |
| Wear Factor “K” x 10-10 | PTM55010 | 35 | Cubic in.-min/ft.lbs.hr |
| Sand Wheel Wear/Abrasion Test | UHMW=100 | ||
| Minimum Mating Surface Hardness | Rockwell (Brinnell) | ||
| Coefficient of Linear Thermal Expansion | E-831(TMA) | 1.7 | in/in/°F x 10-5 |
| Coefficient of Thermal Expansion // to Laminates | E-831(TMA) | in/in/°F x 10-5 | |
| Coefficient of Thermal Expansion I to Laminates | E-831(TMA) | in/in/°F x 10-5 | |
| Softening Point | °F | ||
| Heat Deflection Temperature 264 psi | D648 | 532 | °F |
| Embrittlement Temperature | °F Min. | ||
| Continuous Service Temperature in Air | 500 | °F Max. | |
| Short Term Service Temperature | °F Max. | ||
| Tg-Glass Transition (Amorphous) | D3418 | 527 | °F |
| Melting Point (Crystalline) Peak | D3418 | N/A | °F |
| Thermal Conductivity | F433 | 1.80 | BTU-in/(hr/ft2°F) |
| Dielectric Strength Short Term | D149 | 580 | Volts/mil |
| Volume Resistivity | D257 | ohm/cm | |
| Surface Resistivity | D257 | >1013 | ohm/cm |
| Dielectric Constant, 106 Hz | D150 | 4.2 | |
| Dissipation Factor, 106 Hz | D150 | 0.026 | |
| Flammability @ 3.1mm(1/8 in.) UL94 | UL94 | V-O | |
| Arc Resistance | seconds | ||
| Water Absorption, Immersion 24 Hours | D570 (2) | 0.4 | % |
| Water Absorption, Immersion Saturation | D570 (2) | 1.7 | % |
| Machinability Rating | 5 | 1=easy, 10=difficult | |
| Rod Diameter Availability (Off the Shelf) | .093-2.0 | inches | |
| Sheet Thickness Availability (Off the Shelf) | .187-1.0 | inches |
| Characteristics / Attributes | Very high compressive and impact strength / Great insulation properties / Excellent Bearing Properties |
