ELINVAR EXTRA is an age-hardenable iron-nickel-chromium-titanium alloy having a constant modulus with a zero thermoelastic coefficient over a limited range of temperature from minus 50 deg. F. to a plus 150 deg. F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, joining, and surface treatment. Filing Code: Fe-12. Producer or source: Allied Products Division.