Overview: The document provides technical specifications for the aluminium alloy 7021, known for its homogeneity, strong thickness, and excellent mechanical properties. It is particularly suitable for applications requiring thicknesses over 100mm, such as prototype moulds, elastomer moulds, and structural elements of special machines.

Chemical Composition: The alloy consists primarily of aluminium with zinc (AlZn5,5Mg1,5) and has a low impurity content, enhancing its suitability for welding, anodisation, chemical grinding, and mechanical polishing.

Performance Properties: The alloy is characterized by its stability in machining and resistance to corrosion due to its thermal treatment. Key properties include a modulus of elasticity of 70,000 MPa, a thermal stress coefficient of 23.3 x 10^-6/K, electric conductivity of 19 m/Ohm.mm², thermal conductivity of 135 W/m.k, and a specific gravity of 2.80.

Mechanical Properties: The minimum hardness is 108 HB, with a minimum elongation of 1.3%. The limit of elasticity (Rp 0.2) is 270 MPa, and the minimum resistance to traction is 310 MPa.

Maximum Thickness: The maximum available thickness for this alloy is 400mm.