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Material Information

Hydex® 4101 and 4101L are PBT polyesters (PolyButylene Teraphalate Polyester), which are semi-crystaline thermoplastics that offer outstanding machinability. Hydex® 4101L is an internally lubricated grade that is designed for use in higher wear resistance, PV range, and lower coefficient of friction applications. Hydex® 4101 and 4101L have excellent mechanical properties, no center line porosity, and a low coefficient of friction and wear. Their excellent chemical resistance is an improvement over acetals and will not crack or craze in chlorine. They also have a very low moisture absorption rate, as much as 15 times less than nylon. They outperform UHMW because they are able to withstand steam cleaning temperatures. Overall, Hydex® 4101 and 4101L make good replacements for brass, aluminum, steel, UHMW, and acetal. Hydex® 4101 and 4101L are tough materials that are less brittle than PET so they will not chip or contaminate food products. This makes them FDA, USDA, and 3A Dairy compliant in a natural white color. Hydex® 4101 and 4101L are also available in a black color and come in the forms of rod and sheet.


  • Food piston pumps
  • Valves and valve bodies
  • Feeder blocks
  • Timing screws
  • Gears
  • Cams
  • Bushings and bearings
  • Wear strips
  • Fuel pump components
  • Fuel system connectors and rotors


  • No center line porosity
  • Superior chemical resistance
  • Outstanding machinability
  • Excellent wear properties
  • Very low moisture absorption
  • Low coefficient of friction
  • Good impact strength and ductility
  • Hard and durable surface
  • FDA, USDA, and 3A Dairy compliant (natural)


PhysicalAstm Test MethodHydex® 4101L
Density (lb/in^3)D7920.049
Water Absorption @ 24 hours (%)D5700.07
Tensile Strength (PSI)D6387,200
Tensile Modulus (PSI)D638380,000
Tensile Elongation at Break (%)D63840
Flexural Strength (PSI)D79010,600
Flexural Modulus (PSI)D790390,000
Compressive Strength (PSI)D69511,000
Compressive Modulus (PSI)D695
Izod Impact (Notched), ft-lb/inD2560.7
Rockwell HardnessD785R110
Coefficient of Thermal Expansion,
Heat Deflection Temperature 264 psi, ºFD648195
Melting Point, °FD3418420
Continous Service Temp (Operating), °F221
Thermal Conductivity, BTU-in/hr-ft² °FC177
Flammability RatingUL94HB
Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
Volume Resistivity (ohm-cm) @ 50% RHD257
Dielectric Constant at 60 HzD150
Dissipation Factor at 60 HzD150

Disclosure: 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.


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