Team Rapid Manufacturing Co., Ltd

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Vacuum Casting
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Vacuum Casting
Get 5-200 low volume plastic parts in low cost by silicone mold vacuum casting.

What is Vacuum Casting?

Vacuum casting, people also call it urethane casting or polyurethane casting, which is a manufacturing process used silicone moulds to make low-volume plastic and rubber components under vacuum. Due to the flexibility of silicone, it is an extremely adaptable process to produce complex parts with undercuts in polyurethane resins and cast nylon. Vacuum casting is popularly used in rapid prototype manufacturing for some parts need small volume and no special requirements for the product's materials.

Vacuum Casting Production Process

Vacuum casting is one of the most economical prototyping and low volume manufacturing process, the working flows of vacuum casting:

Step 1: Prepare the master model by 3D printing or CNC machining. The master model needed to be perfectly, as the casting parts are patterned by master.

Step 2: Located and firmed the master model into the right position of a custom size wooden box.

Step 3: Mix and pour the silicone into a the box to making silicone mould.

Step 4: Split the silicone mould along the parting lines by knife, the process needed to be processed carefully and detailed, anything wrong usually leads to mould damage.

Step 5: Take out the master model, maintain and store the master model well in order for the next round silicone mould making.

Step 6: Mix and pour the Polyurethane into the silicone mold to do the casting. The casting is under vacuum, the bubbles inside can be vacuumed out.

Step 7: Remove the gate, overflows and flashes on the casting parts.

Step 8: If the parts have post finish requirement such as painting, silk printing etc, we will process it after deburr.

Step 9: First part copped.

Step 10: First part inspection and quality control during low volume manufacturing.

Vacuum Casting Materials 

As the development of molecular and material science, materials used in vacuum casting are diversities. Thermoplastics, rubbers and resins are the 3 major vacuum casting materials, which can emulate specific properties and characteristics including degrees of:

1. Physical appearance quality.

2. Surface texture/finish.

3. Transparency/translucence.

4. Rigidity.

5. Flexibility.

6. Strength.

7. Hardness.

8. Temperature resistance.

9. UV stability.

10. Color.

Application of vacuum casting parts is massive. We usually depends on the parts function and application to suggest our customer about materials, UP4280(ABS like material), PX521(PC like material), UPX8400(Rubber like material) are some of the most commonly used materials at TEAM Rapid. Ready for your next vacuum casting project? Contact our team at to get free materials suggestions.

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