Material Properties Polyetheretherketone (PEEK) Carbon Fiber Filled admin May 20, 2016January 17, 2017 Material Properties for Polyetheretherketone (PEEK) Carbon Fiber Filled Physical specifications of materials. Materials Polyetheretherketone (PEEK) Description Carbon Fiber Filled Density g/cc 1.436 lb/in^3 0.05185 Hardness Brinell unless specified 96(Rockwell-M) Tensile Strength ultimate Mpa 176 Ksi 25.52 Yield Strength MPa Ksi Modulus of Elasticity Gpa 11 10^6 Psi 1.594202896 Poisson’s Ratio 0.44 %Elongation at break 2 %Reduction of area Izod Impact J 0.12 Ft-lb 0.088536 Fracture Toughness Mpa(m)^0.5 Ksi(in)^0.5 Thermal conductivity W/m-K 0.6 Btu/ft-h-F 0.3468208092 Specific Heat Cpacity J/g-K 1.9 Btu/lb-F 0.456 Coefficient of thermal expansion 1E-6/K 21 1E-6/F 11.684210517 Electrical Resistivity Ohm-cm 1000000000