Material properties Tomt E-glass Carbon Steel MPa 1000-1500 1500-2500 500 E GPa 45-55 125-150 200 Material characteristics Tomt Fiberbar fiberglass Steel Density tonnes/m3 1.95 7.85 Thermal exp/K 5 x 10 -5 9 x 10 -5 Thermal con. W/m/K 1 30 Resistivity ohm/cm 10 15 1.3