Material Properties Polyetheretherketone (PEEK) Glass Fiber Filled admin May 20, 2016January 17, 2017 Material Properties for Polyetheretherketone (PEEK) Glass Fiber Filled Physical specifications of materials. Materials Polyetheretherketone (PEEK) Description Glass Fiber Filled Density g/cc 1.475 lb/in^3 0.0533 Hardness Brinell unless specified 101(Rockwell-M) Tensile Strength ultimate Mpa 140 Ksi 20.3 Yield Strength MPa 98 Ksi 14.21 Modulus of Elasticity Gpa 21 10^6 Psi 3.043478256 Poisson’s Ratio 0.45 %Elongation at break 3 %Reduction of area Izod Impact J 1.1 Ft-lb 0.81158 Fracture Toughness Mpa(m)^0.5 Ksi(in)^0.5 Thermal conductivity W/m-K 0.33 Btu/ft-h-F 0.19075144506 Specific Heat Cpacity J/g-K 1.9 Btu/lb-F 0.456 Coefficient of thermal expansion 1E-6/K 25 1E-6/F 13.909774425 Electrical Resistivity Ohm-cm 1000000000000000