The Yellow Sheets, Tempers for Aluminum and Aluminum Alloy Products (revised December 2025, superseding August 2025), record the registered tempers in U.S. customary form. The document explains 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 from the registered list, and then lists the registered tempers for wrought products with their definitions and typical applications. It is the companion volume to the metric Tan Sheets and is used when tempers such as T6, T651, H32 or O are specified on drawings and purchase orders.