Aluminium-lithium alloy (Al 2195)

Properties and usage


It is 30 % stronger and 5 % less dense than the Al 2219 alloy used in the original Space Shuttle's external tank.

Metallurgical formula
 The alloy composition of Al 2195 aluminium is: 
 * 1) Aluminium: 91.9 to 94.9%
 * 2) Copper: 3.7 to 4.3%
 * 3) Lithium: 0.8 to 1.2%
 * 4) Manganese: 0.25 to 0.8%
 * 5) Silver: 0.25 to 0.6%
 * 6) Zirconium: 0.08 to 0.16%
 * 7) Iron: 0.15% max
 * 8) Silicon: 0.12% max
 * 9) Titanium: 0.1% max
 * 10) Zinc: 0.25% max
 * 11) Residuals: 0.15% max