Material Properties Polystyrene admin May 20, 2016January 17, 2017 Material Properties for Polystyrene Physical specifications of materials. Materials Polystyrene Description Density g/cc 1.06 lb/in^3 0.0381 Hardness Brinell unless specified 72(Rockwell-m) Tensile Strength ultimate Mpa 45 Ksi 6.525 Yield Strength MPa 46 Ksi 6.67 Modulus of Elasticity Gpa 3.25 10^6 Psi 0.471014492 Poisson’s Ratio 0.33 %Elongation at break 22.5 %Reduction of area Izod Impact J 0.18 Ft-lb 0.132804 Fracture Toughness Mpa(m)^0.5 Ksi(in)^0.5 Thermal conductivity W/m-K 0.16 Btu/ft-h-F 0.09248554912 Specific Heat Cpacity J/g-K 1.7 Btu/lb-F 0.408 Coefficient of thermal expansion 1E-6/K 87 1E-6/F 48.406014999 Electrical Resistivity Ohm-cm 1000000000000000