Home Products Alloys MoldMAX Alloys MoldMax Alloys MoldMAX XL MOLDMAX XL® MoldMAX XL® is a high-strength copper mold alloy with good thermal conductivity. MoldMAX XL contains no beryllium and has a hardness comparable with AISI P-20 tool steel, but its thermal conductivity is two to three times higher. AVAILABLE FORMS, SIZES AND TOLERANCES MoldMAX XL is available in rounds, square and rectangular bars and plate. For more information, download our MoldMAX XL data sheet. SPECIFICATIONS AND STANDARDS MoldMAX XL is certified to hardness and conductivity only. LEARN MORE ABOUT MOLDMAX XL® For more information about MoldMAX XL plastic tooling alloys, contact Materion Performance Alloys today.