Product Features MJ Aluminium’s aluminum sign blanks meet all China, European and U.S. standards, include holes for mounting, and are pretreated for painting or sheeting. All MJ Aluminium’s Signs aluminum blanks are punched with radius corners and mounting holes in accordance with the Federal Standard Highway Signs Manual. Alodized Aluminum Blanks are bare metal that has been chemically treated to meet ASTM B 499 specifications as pre-treatment for paint or sheeting applications.