Temper is the combination of aluminum strength and hardness produced by mechanical and/or thermal treatments.

The measures used to test mechanical properties of aluminum are tensile, yield, and elongation.

	Tensile	an indication of the maximum pulling load that a material can stand without failure, usually measured in kilograms per square centametre of cross-sectional area.
	Yield	the stress at which a material first exhibits a specific permanent set.
	Elongation	the maximum percentage of stretch a material will stand before breaking.
Hardness is measured using the following standards:
	Rockwell	an indentation hardness test based on the penetration depth of a specified penetrator into a specimen under certain fixed conditions.
	Webster	a relative indicator of hardness but does not guarantee certificate of compliance requirements.
A defined range of alloy and temper properties must be met in order to satisfy certificate of compliance requirements.