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Vacuum casting process

What is vacuum casting?

Vacuum casting is a process in which a mold is created using a silicone rubber or urethane resin. The mold is placed in a chamber where it is surrounded by a material that will later be used to create the final product. The chamber is then sealed and the air is removed, creating a vacuum. This vacuum pulls the material into the mold, where it cures or hardens.

Vacuum casting, also called vacuum forming, is a type of plastic molding where sheets of heated plastic are drawn into a mold using vacuum pressure. It’s commonly used to create prototypes and low-volume production runs for plastic parts.

Vacuum casting is similar to injection molding, but it’s typically used for smaller batches or prototype parts because the process is less expensive. Injection molding requires steel molds that can cost tens of thousands of dollars to produce, while vacuum casting molds can be made from 3D-printed resin for a few hundred dollars.

The process begins with a 3D-printed mold, which is placed on a platform inside a chamber. The chamber is then sealed and evacuated of all air using a vacuum pump.

Once the chamber has reached the desired level of vacuum, molten plastic is poured into the mold. The molten plastic is drawn into the mold by the vacuum pressure, and it cools and hardens to take on the shape of the 3D model.

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