The Purple Sheets, Designations and Chemical Composition Limits for Aluminum Powders and Aluminum Alloy Powders (published August 2025, superseding December 2022), cover the registered designations and composition limits for powder products. The contents include Table 1 with registered designations and chemical composition limits for powders, Table 2 with calculated theoretical densities of active powders, Table 3 with registered chemical composition limits of inactive powders and powder products, the recommendations for chemical composition limits and for designations of powders, footnotes, and appendices on the use and assignment of powder designations and on the deactivation of designations. The record is used by powder producers, additive manufacturing suppliers and purchasers who must specify and verify powder composition.