PBT Polyester

HYDEX® 4101 is a PBT polyester thermoplastic that can withstand higher impact than PET polyesters and thus carries reduced risk of part breakage in operation. It is a food grade plastic material that can meet most agency requirements for food contact compliance, and is ideal for machined parts in food processing equipment. HYDEX™ 4101 has excellent resistance to typical cleaning chemicals such as chlorine and caustic solutions and has a very low moisture absorption rate, as much as 15 times less than nylon.



Chemical designation
PBT (Polybutylene terephthalate)
1,31 g/cm3

Main Features

  • resistent to cleaning agents
  • very good chemical resistance
  • good wear resistance
  • good impact strength
  • low moisture absorption

Target industries

Technical details

  • Mechanical properties
    Mechanical propertiesValueUnitConditionTest Method
    Tensile strength9,400psi@ 73 °FASTM D 638
    Modulus of elasticity
    (tensile test)
    430,000psi@ 73 °FASTM D 638
    Elongation at break50%@ 73 °FASTM D 638
    Modulus of elasticity
    (flexural test)
    430,000psi@ 73 °FASTM D 790
    Impact strength (Izod)0.7ftlbsinASTM D 256
    Coefficient of friction0.25lbs/in^2Dynamic, 40 psi, 50 fpm-
    Wear rate210*10-10in3minftlbshr@ 2000 PV-
    Coefficient of friction0.19lbs/in^2Static-
    Elongation at yield6%@ 73 °FASTM D 638
    Flexural strength13,000psi@ 73 °FASTM D 790
    Rockwell hardness87-M ScaleASTM D 785
    Compression strength2,800psi@ 73 °F, 1% strainASTM D 695
    Compression strength11,500psi@ 73 °F, 10% strainASTM D 695
    Compression modulus315,000psi@ 73 °FASTM D 695
  • Thermal properties
    Thermal propertiesValueUnitConditionTest Method
    Deflection temperature200F@264 psiASTM D 648
    Service temperature221FLong Term-
    Deflection temperature310F@ 66 psiASTM D 648
    Thermal expansion (CLTE)6.1*10^-5 in/in / degre-
  • Other properties
    Other propertiesValueUnitConditionTest Method
    Moisture absorption0.02%@ 24 hrs, 73 °FASTM D 570
    Limiting PV6,000psi-fpm@ 100 fpm-
    Flammability (UL94)HB--

Stock program