Density2.85 g/cm3 (178 lb/ft3)Elastic (Young's, Tensile) Modulus74 GPa (11 x 106 psi)Electrical Conductivity30 % IACSElongation at Break10 %Fatigue Strength (Endurance Limit)103 MPa (15 x 103 psi)Melting Onset (Solidus)543 °C (1010 °F)Specific Heat Capacity860 J/kg-KStrength to Weight Ratio151 kN-m/kgTensile Strength: Ultimate (UTS)430 MPa (62 x 103 psi)Tensile Strength: Yield (Proof)330 MPa (48 x 103 psi)Thermal Conductivity120 W/m-KThermal Diffusivity49Thermal Expansion22 µm/m-KChemical Composition limits2219 Al Bal,Si Max 0.20,Fe Max 0.30,Cu 5.80-6.80,Mn 0.20-0.40,Mg Max 0.02,Zn Max 0.10,Ti 0.02-0.10 Others 0.05 ea 0.15 Total