What type of molds can be described as expendable?

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Expendable molds refer to molds that are used for a single casting and are then destroyed or otherwise unusable after the casting process is complete. Sand molds fit this definition perfectly. They are made from a mixture of sand, clay, and water, and are designed to create a cavity for molten metal during the casting process. Once the casting has been completed and the metal has cooled and solidified, the sand mold is typically broken apart to remove the casting, rendering it unusable for future castings.

In contrast, permanent molds are designed to be reused multiple times, which disqualifies them from being classified as expendable. Metal molds, similar to permanent molds, are durable and intended for repeated use in the casting processes. Core molds, while they may be used in some temporary instances, primarily serve to create internal features in cast parts and are often made from materials that are not expendable in the same contextual way as sand molds. Therefore, sand molds represent the quintessential example of expendable molds in casting processes.

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