Accelerated Ageing and Characterisation of UHMWPE used in Orthopaedic Implants

Material: Accelerated Ageing and Characterisation of UHMWPE used in Orthopaedic Implants
Composition: (CH2)n
Property Minimum Value (S.I.) Maximum Value (S.I.) Units (S.I.) Minimum Value (Imp.) Maximum Value (Imp.) Units (Imp.)
Atomic Volume (average) 0.0049 0.005 m3/kmol 299.016 305.119 in3/kmol
Density 0.94 0.95 Mg/m3 58.6823 59.3066 lb/ft3
Energy Content 115 130 MJ/kg 12458.9 14084 kcal/lb
Bulk Modulus 0.8 0.93 GPa 0.11603 0.134885 106 psi
Compressive Strength 30 38 MPa 4.35113 5.51143 ksi
Ductility 4 5 4 5 NULL
Elastic Limit 20 30 MPa 2.90075 4.35113 ksi
Endurance Limit 13 19.5 MPa 1.88549 2.82823 ksi
Fracture Toughness 2.8 3 MPa.m1/2 2.54813 2.73014 ksi.in1/2
Hardness 70 90 MPa 10.1526 13.0534 ksi
Loss Coefficient 0.053 0.15 0.053 0.15 NULL
Modulus of Rupture 20 30 MPa 2.90075 4.35113 ksi
Poisson's Ratio 0.4 0.42 0.4 0.42 NULL
Shear Modulus 0.16 0.18 GPa 0.023206 0.0261068 106 psi
Tensile Strength 32 35 MPa 4.64121 5.07632 ksi
Young's Modulus 0.45 0.5 GPa 0.065267 0.0725188 106 psi
Glass Temperature 160 170 K -171.67 -153.67 °F
Latent Heat of Fusion kJ/kg BTU/lb
Maximum Service Temperature 325 370 K 125.33 206.33 °F
Melting Point 400 410 K 260.33 278.33 °F
Minimum Service Temperature 210 220 K -81.67 -63.67 °F
Specific Heat 1950 2100 J/kg.K 1.50902 1.6251 BTU/lb.F
Thermal Conductivity 0.42 0.45 W/m.K 0.786254 0.842415 BTU.ft/h.ft2.F
Thermal Expansion 125 135 10-6/K 225 243 10-6/°F
Breakdown Potential 27 28 MV/m 685.8 711.2 V/mil
Dielectric Constant 2.2 2.35 2.2 2.35 NULL
Resistivity 1e+023 1e+024 10-8 ohm.m 1e+023 1e+024 10-8 ohm.m
Environmental Properties
  Resistance Factors
1=Poor 5=Excellent
Flammability 1
Fresh Water 5
Organic Solvents 3
Oxidation at 500C 1
Sea Water 5
Strong Acid 5
Strong Alkalis 5
UV 3
Wear 4
Weak Acid 5
Weak Alkalis 5

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