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Vacuum Casting Process Advantages & Disadvantages & Materials Guide


Vacuum Casting Process Advantages & Disadvantages, Process & Materials 

Vacuum Casting is the production process In which resin material is put into a mould with the help of a vacuum. Vacuum casting is one of the most popular methods for casting.



It is also known as polyurethane casting, and urethane casting(other popular terms used for Vacuum casting are- silicone tooling/moulding, soft moulding, room‐temperature‐vulcanizing tooling/moulding, or resin casting ). It is suited best for rapid prototyping, and low-mid volume batch production. It can be considered an economic replacement for Injection moulding. It has a wide range of material options, which are more versatile, isometric & have better properties.

Vacuum Casting Process Advantages & Disadvantages

Vacuum Casting Advantages 

Vacuum casting can produce faster than  3d printing & injection moulding

The vacuum casting method has lower material waste, manufacturing & moulding cost.

It is eco-friendly & can achieve material advantages like flexibility, rigidity, smoothness & surface finishing.

It is easier to achieve complex design & parts with vacuum casting.

Vacuum Casting Disadvantages

Vacuum casting could not support large series production.

Vacuum Casting  Process

1. Make the Master: Master part is created from the product's 3d Model. It can be produced with traditional methods like cnc machining or modern methods like 3d printing with sla or any other technology. This modern method is the fastest & low cost to create a master. This master pattern is used for making a mould. 

 2. Make a Silicone Mould: Casting moulds are made with liquid silicone. The casting Box should be half-filled with liquid silicone. Then it should be heated at  40℃ temperature for about 8 to 16 hours to cure silicone into mould. After that you need to fill more silicone liquid & cure it similarly with the above shown. Once it is dried. Cut the casting box & need to remove the master pattern. 

3. Start Production Through Vacuum Casting: Now the production can be started, it can easily produce 20 or more parts at a time. Pour Polyurethane resin material into the Mould. As we know the Vacuum is used for manufacturing bubble-free parts. 

Materials Used In Vacuum Casting 

Rubbers: Rubber materials are used to make seals & gaskets due to its high durability, longevity, flexibility, & versatility. These materials are most affordable. 

Polycarbonates: Polycarbonates are popular for their resistance & appearance. It can hold out Extreme high & low temperatures. Polycarbonate can be referred to for components & part which needs high resistance. 

Polypropylene:  Polypropylene is durable and long-lasting. It is affordable & easily available in the market. Most of goods & products are made with polypropylene materials due to its characteristics of long-lasting & quick forming. It is the second most used material in vacuum casting. 

ABS: ABS material is also popular for its high temperature & chemical resistance, low shrinkage, & food grade compliance.

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