sprues

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Scope note
Channels that feed molten material to a mold, in contrast to a vent,which lets air escape. Both sprues and vents make up the “sprue system,” which circulates molten material from a pouring cup through a refractory mold and allows air and casting vapors such as steam to be released. In lost-wax casting, “sprue” is the term used for the solid wax rods (rarely reeds or terra-cotta pipes) used to create the channels in the mold. Sprues are also the solid metal that has filled the channels upon cooling, which is generally removed during fettling.
sprues
Accepted term: 01-Dec-2025