What is Vacuum Casting

Ready for your Marketing and Functional Test

Vacuum Casting is a copying technique used for the production of small series of functional plastic parts. Using two-component polyurethanes and silicone molds, Vacuum Casting is known for its fast production of high-quality prototypes or end-use products.

Why choose Vacuum Casting?


Silicone molding results in high-quality parts comparable to injection-molded components. This makes vacuum casted models especially suitable for fit and function testing, marketing purposes or a series of final parts in limited quantities. Vacuum Casting also lends itself well to a variety of finishing degrees, and we can match the finish you need for your parts.

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What is Vacuum Casting

Molds can be made in a couple of days
◆  Molds are durable for 20 or more copies
◆ Economical Mold
◆ Pre-launch product testing
◆ Small series of housings and covers
◆ Wide range of post-processing techniques can be choosed 

How Does Vacuum Casting Work?

Step 1  Get the 3D model
Step 2  Master built in CNC or SLA
Step 3  Master is immersed in silicone to form the mold
Step 4  Polyurethane is poured into the mold and casted under vacuum
Step 5  Post-treatment for the Product

Technical Specifications
Standard lead time
Up to 20 copies within 10 working days
Standard accuracy
±0.2% (with a lower limit on ± 0.2 mm on dimensions smaller than 100 mm)
Minimum wall thickness
To ensure that the mold is filled properly, a wall thickness of at least 0.75 mm is necessary. For best results, we recommend a wall thickness of at least 1.5 mm
Maximum part dimensions
The size of the mold is limited by the dimensions of the vacuum chamber (1900 x 900 x 750 mm) and by the volume of the product (maximum volume: 10 liters)
Typical quantities: 10-50pcs
Surface structure: Painting/Electroplating
High-quality surfacefinish comparable to injection molding

Why choose Vacuum Casting with GD prototyping?

Economical Cost: Compared with other low volumen production technique, the vacuum casting is one of the most economical processing technique to make your parts.

Advanced Imported Material: At our silicon mold center, we use the advanced material to make your parts, with datasheet and material report provided .

Diverse Post-treatment: Generally the parts that come out directly from the silicon mold may need some post-treatment like painting or silk screen. As your one stop partner you can find a wide range of finishes for your projects.

Premium Quality: Our professional and experienced engineers will control every processes during the product-making, with nearly ZERO rejection rate for the quality of this processes.

Expectational speed: Every RFQ will be answered within 12 hours and normally the vacuum casting takes 7-14 days to delivery the parts.  

High-Complex Vacuum Casting techiques: At Best Protoypes, we have lots of sucessful cases regarding of this process, such as: Overmoulding (Premade parts are placed into the mold to mold over them together. Such as:Instrument board) and 2 colors silicon mold (A silicon mold that fabricates two different colors for parts.Such as: Automotive lamp. )

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CNC machining parts

We offer a wide range of CNC machining services including milling and turning of various materials, as well as drilling, tapping, EDM (Electrical Discharge Machining), and wire EDM.


Vacuum Casting

Vacuum Casting is a copying technique used for the production of small series of functional plastic parts.