Properties

Torlon® PAI combines the exceptional performance of thermoset polyimides with the melt-processing advantage of thermoplastics. In addition to wear-resistance, toughness, and high strength at elevated temperatures, Torlon® PAI resins exhibit greater compressive strength and higher impact resistance than most advanced engineering plastics. High creep resistance and an extremely low coefficient of linear thermal expansion (CLTE) provide excellent dimensional stability.

High-Temperature Wear Resistance 

Wear-resistant grades of Torlon® PAI offer tailored combinations of mechanical and tribological properties, along with excellent chemical resistance and high thermal stability. This accounts for Torlon® PAI’s broad acceptance in replacing metal over a wide range of temperature and PV conditions, even when lubrication is marginal or non-existent. Specially formulated grades can perform in lubricated environments at exceptionally high pressures and velocities (PV).

Discover all Torlon® PAI grades

High Strength at Elevated Temperature

Torlon® PAI offers unmatched strength at elevated temperatures, exhibiting greater strength at 200°C (400°F) than other advanced engineering resins at room temperature. High-strength grades are used to manufacture precision components used in repetitive-use, load-bearing operations. Glass-fiber and carbon-fiber-filled grades add strength and stiffness at high temperature, with the added benefit of low creep, excellent fatigue resistance, and enhanced thermal expansion properties.

Chemical Resistance

Torlon® PAI is virtually unaffected by aliphatic and aromatic hydrocarbons, chlorinated and fluorinated hydrocarbons, and most acids at moderate temperatures. The polymer, however, may be attacked by saturated steam, strong bases, and some high-temperature acid systems. Proper post-cure of Torlon® PAI parts is necessary to achieve optimal chemical resistance.

Like other high-temperature engineering resins and composites, Torlon® PAI parts absorb water, but the rate is slow and parts can be rapidly restored to original dimensions and properties by drying.

Of particular interest to aerospace and automotive engineers is the ability of a polymer to maintain its properties after exposure to commonly used fluids. Total immersion tests show Torlon® PAI is not affected by aircraft hydraulic fluid at low temperatures or by common lubricating fluids and turbine oil, even under stress at elevated temperatures.