Divine Metal & Alloy A wrought alloy grade, alumiun 8011 is an alloy that contains a high content of silicon in its chemical composition. To bring about the best in the alloys, it is very common for the 8011 Aluminium Foil to be tempered. Usually, tempers designated as H14 & H18 are practiced on this grade. The letter designation H indicates that the alloy is tempered by strain-hardening. Strain hardening is considered to be ab ideal choice for non-heat-treatable alloys such as Din 3.4144 Shim Sheet. This is because strain hardening tends to improve their strength. A temper such as strain hardening is practiced typically at room temperature.