The Tan Sheets, Tempers for Aluminum and Aluminum Alloy Products — Metric Edition (revised December 2025, superseding August 2025), record the registered tempers for wrought and cast products in SI units. The contents explain the temper registration system, the procedure for individual registration of tempers, the procedure for registration through the Aluminum Association Technical Division, the requirements for proposed changes to registered tempers and for deletion of tempers from the registered list, and then list the registered tempers for wrought products with their definitions and applications. The metric edition is used where temper is specified in SI units, for example when ordering to a metric drawing or comparing with international designations.