What are the standard tempers available for 8011 aluminum?
8011 is commonly available in O (annealed), H12, H14, H16, and H18 tempers. The O temper offers maximum softness for deep forming. H12-H18 represent varying degrees of work hardening. Higher H-numbers indicate greater hardness and strength. Temper selection depends on application requirements.
How does the O (annealed) temper affect 8011 properties?
O temper provides the highest ductility (over 20% elongation). It has the lowest yield strength (30-50 MPa). This condition is ideal for complex forming operations. The alloy is stress-relieved through controlled cooling. It's commonly used for food packaging foil production.
What are the key differences between H12-H18 tempers?
H12 has been lightly work-hardened (1/4 hard). H14 represents half-hard condition with balanced properties. H16 provides 3/4 hardness for stiffer applications. H18 achieves full hardness through severe cold working. Tensile strength increases progressively from H12 to H18.
Which temper is best for pharmaceutical blister packaging?
H18 temper is preferred for blister foils. It offers the highest puncture resistance. The full-hard condition maintains package integrity. It provides necessary stiffness for automated filling. Surface remains smooth for clean peeling.
Can 8011 be supplied in custom tempers?
Yes, manufacturers can provide intermediate tempers. Special H19 or H22 variants may be available. Custom annealing cycles can modify properties. Tempers are adjusted through controlled rolling processes. Such customization requires specific technical agreements.
