TECAPAI CM XP440 black-green

PAI Modified Bearing Grade

Proprietary additives are what makes TECAPAI CM XP440 black-green compression moulded 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 moulded allows for minimum run quantities as low as 1 piece, which adds to the product's appeal.

Torlon® PAI is a registered trademark of the Solvay Group.


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

Main Features

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

Target industries

Technical details

  • Mechanical properties
    Mechanical propertiesValueUnitParameterNorm
    Tensile strength at break82MPa5mm/minDIN EN ISO 527-2
    Modulus of elasticity
    (tensile test)
    4300MPa1mm/minDIN EN ISO 527-2
    Elongation at break4,7%5mm/minDIN EN ISO 527-2
    Flexural strength134MPa2mm/min, 10 NDIN EN ISO 178
    Modulus of elasticity
    (flexural test)
    4000MPa2mm/min, 10 NDIN EN ISO 178
    Compression strength13/33/87MPa1% / 2% / 5%EN ISO 604
    Shore hardness88-D scaleDIN EN ISO 868
    Impact strength (Charpy)34kJ/m2max. 7,5JDIN EN ISO 179-1eU
    Ball indentation hardness193MPaISO 2039-1
  • Thermal properties
    Thermal propertiesValueUnitParameterNorm
    Thermal expansion (CLTE)3,510-5*1/K23-60°C, longitudinalDIN EN ISO 11359-1;2
    Glass transition temperature283CDIN EN ISO 11357
    Thermal expansion (CLTE)3,510-5*1/K23-100°C, longitudinalDIN EN ISO 11359-1;2
  • Other properties
    Other propertiesValueUnitParameterNorm
    Flammability (UL94)V0-3,3 mm-
    Moisture absorption0,3 / 0,5%24h / 96h (23°C)DIN EN ISO 62

Stock program