High Quality Vacuum Casting/Silicon Mold

Sun-Tech is fully capable of handling your vacuum casting and silicone molding needs. With years of expertise in the field, we can fabricate your parts to the highest standard and with fast turnarounds.

Vacuum casting is a great way to make rigid or flexible parts, and is ideal for prototypes, engineering testing, concept proofing and display demos. These parts can be made from hundreds of casting polymers.

Vacuum casting is a manufacturing technology that uses a vacuum to draw liquid material into a mold. It differs significantly from injection molding, which pushes liquid material into a mold using a screw.
The process of vacuum casting offers significant advantages, and is particularly useful for parts that have undercuts or fine details.
The process starts with a master model, which 3ERP creates using one of its CNC machining centers — though 3D printing can also be used. This master model is then immersed in liquid silicone, which is cured and becomes the mold.
Once it has been cut and the master model removed, the silicone mold can be put to use. This stage involves pouring casting resin into the mold, as the vacuum removes bubbles and air pockets to ensure a smooth finish.
The resin part is then cured and removed from the silicone mold, which can be reused around 20 times.
Each resin part is an exact copy of the original master model.

Advantages of Vacuum Casting

1 Fast turnaround

Sun-Tech can provide up to 20 parts in 15 days or less, depending on part specification and volume.

2 Affordability

Silicone molds are less expensive than the tooling used for injection molding, resulting in low prices.

3 Capable of producing large parts

Depending on the type of equipment used, vacuum casting can to create very large parts.

4 Superior surface finish to injection molding

The vacuum process removes air bubbles and allows the material to capture fine details.

5 Color options

Coloring pigments can be added to the resin for a variety of color options.

6 Repeatability

Silicone molds can be used around 20 times before they need replacing.