TECAPAI® CM XP440 black-green

PAI Modified Bearing Grade

Proprietary additives are what makes TECAPAI CM XP440 black-green compression molded PAI plastic an excellent choice as a bearing and seal material. Solvay Specialty Polymers provides the Torlon® material from which this bearing grade polyamide-imide is made, and it can be considered as Ensinger's version of a product commonly referred to in web searches as “torlon 4540”. It has excellent tribological properties including a low coefficient of friction. Additionally, TECAPAI CM XP440 has a low CLTE and good compression strength. It also maintains strength and stiffness at elevated temperatures, and combines very good machinability with strong chemical resistance to round out its polyamide-imide properties profile. Users in the oil and gas industry will find TECAPAI CM XP440 black-green a useful Torlon material in labyrinth seals for compressors and pumps, as well as other bearing and wear components. Finally, the fact that TECAPAI CM XP440 black-green is compression molded allows for minimum run quantities as low as 1 piece, which adds to the product's appeal.


Chemical designation
PAI (Polyamide-imide)
1,46 g/cm3

Main Features

  • excellent wear properties
  • very good thermal stability
  • excellent dimensional stability
  • good machinability

Target industries

Technical details

  • Mechanical properties
    Mechanical propertiesValueUnitConditionTest Method
    Tensile strength at break9,300psiASTM D 638
    Modulus of elasticity
    (tensile test)
    580,000psiASTM D 638
    Elongation at break3.1%ASTM D 638
    Flexural strength15,000psiASTM D 790
    Modulus of elasticity
    (flexural test)
    580,000psiASTM D 790
    Compression strength4,500psi1% strainASTM D 695
    Compression strength22,000psi10% strainASTM D 695
    Compression modulus350,000psiASTM D 695
    Shore hardness88-D scaleASTM D 2240
    Impact strength (Izod)0.6ftlbsinnotchedASTM D 256
    Coefficient of friction0.14-staticASTM D 1894
    Coefficient of friction0.18-dynamicASTM D 1894
  • Thermal properties
    Thermal propertiesValueUnitConditionTest Method
    Deflection temperature500F@ 264 psiASTM D 648
    Glass transition temperature529FASTM D3418
    Thermal expansion (CLTE)1.94*10^-5 in/in / degre-40 °F to 302 °FASTM E 831
  • Other properties
    Other propertiesValueUnitConditionTest Method
    Flammability (UL94)V-0-3.3 mm-
    Limiting PV9,300psi-fpmASTM D 3702
    Moisture absorption0.2%24 hr immersionASTM D 570
    Moisture absorption1.6%saturationASTM D 570

Stock program