Glossary A-CC-CD-EF-GG-II-MN-PP-SS-SS-TT-VW Growth expansion of a casting as a result of aging. Hot chamber machines die casting machines which have a plunger or injection system in continuous contact with molten metal. Hot short term used to describe an alloy which is brittle or lacks strength at elevated temperatures. Impact strength ability to resist shock, as measu.red by a suitable testing machine. Ingot a pig or slab of metal or alloy.