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Vacuum Casting

Vacuum Casting is a mid-to-low production volume process for customers who need high quality, cosmetic finish, end-use parts in a fast turnaround. We not only produce vacuum casting plastic parts with production-level quality but also offer a wide range of finishing services and post-machining services to ensure your requirements of quality, exterior looking, performance, and color selection are met. 

Introduction of Vacuum Casting Service

Vacuum Mould Casting is a good manufacturing method to produce great quality prototypes and low volumes of parts from soft silicone mould. Its big advantage when compared with injection moulding is that silicone ‘soft’ mold is made quicker and cheaper than metal ‘hard’ tool. The polyurethane parts from vacuum casting process in rapid prototyping are superior quality, precise and have the same great performance as the production parts.

Advantages of Vacuum Casting

Time Saving Time Saving

Typically, a silicone mold can cast about 15-25 parts. Also, soft tooling is cheaper and more time-saving than hard tooling.

Production Quality Production Quality

The polyurethane vacuum cast parts have the same cosmetic and performance criteria with the production-level components.

Speed Speed

The molds can be made in 2 days, the polyurethane cast parts can be completed in 1-2 weeks, depending on the order volume.

Low Cost Low Cost

A silicone mold is durable for 15-25 parts, making it affordable to produce mid-to-low production volumes when you would like to order 1 or 100+ pieces of parts.

Wide Material Selection Wide Material Selection

There is a wide array of rigid, flexible, rubber-like plastic materials available. The material can be tuned to your specific shore durometer from very soft (shore A) to very rigid (shore D).

A Wide Range of Finishes A Wide Range of Finishes

We offer a wide range of color options including clear, black, and Pantone/RAL color matching. We also provide a wide variety of custom surface finish options, which include sandblasting, plating and painting.

Vacuum Die Casting Process

The polyurethane vacuum die casing process has three major steps:


Building the Master Pattern. 

The master pattern can be made using an subtractive manufacturing process, CNC machining or additive manufacturing process like stereolithography (SLA) or Selective Laser Sintering (SLS) 3D printing processes. 

Creating the Mold. 

Putting master pattern into a casting frame and filling the frame with silicone material to shape a mold. Once cured, the mold is cut into halves and the master pattern is removed, forming a cavity to cast parts. One master pattern can be repeatedly used to leave multiple molds, making the vacuum die casting process an optimal option for on-demand, mid-to-low production runs.


Casting Products.  

Injecting the liquid polyurethane material into the silicone mould and then placing the silicone mold in a vacuum chamber. When the mold hardens, the mold halves are set apart and the polyurethanes can be casted in vacuum pressure. 15-25 copies can be casted throughout the casting process in a repeated way.


Vacuum Casting Process

Vacuum Casting Tolerances

The finished dimensions of vacuum casting parts depend on the accuracy of the master piece, part structure and casting material. As a general role, ± 0.25% tolerance is expected.

Vacuum Casting Tolerance

Vacuum Casting Material

LC Rapid has hundreds of materials to meet your unique production needs. These casting polymers can meet industry-specific applications requirements. There is also a wide range of colors available range from opaque, translucent, completely transparent or colored to match specific color requirements.

Vacuum Casting Material

Vacuum Casting Finishes

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Pad Printing & Silk Screening

We use plating to improve corrosion and wear resistance, enhance durability, perfect cosmetic surfaces. The plating commonly use the metals such as zinc, nickel, chrome, precious metals-gold and silver. 


We are able to paint the vacuum casting parts if you specify a color by telling us the PMS or RAL color number. We only use good quality paints to meet all your requirements of colors and textures.


We use sanding to achieve a smooth surface as our standard finish. The good smooth surface prepares for later surface operation properly.

Pad Printing & Silk Screening

We can offer custom graphic on parts in various colors, which can be used for branding, labeling and part name & number identification.

Pad Printing & Silk Screening
Vacuum Casting Solutions

Vacuum casting is frequently utilized for automotive applications including interior and exterior components.


Several of the robotic pieces produced with vacuum casting because it is cost-effective, high-quality and fast.


Vacuum Casting process is used in medical industry including the device casings and housing. The casted housing for the medical device proves production level high quality results. 

Common Vacuum Casting Applications

Consumer Testing

It is the best way to do consumer testing with a physical concept model. With advantages of cosmetic surface, precise dimension, production-level performance, rapid turn-around, competitive cost, polyurethane cast parts are ideal for customer testing such as for the aerospace plating company

Low-Volume Manufacturing

The vacuum casting process can be done very quickly because the silicone molds which used to cast copies are made in a very short lead time. It is used a lot for low volume production runs with such a quick turnaround and cost effective price.

Rapid Prototyping

Vacuum casting process in rapid prototyping is not complicated. A silicone vacuum casting mould is last for about 15-25 copies, therefore it is easy and economical to verify designs or make any needed design changes. Moreover, we can pour different polyurethane materials into the same silicone mould, making it cost effective and time saving to test designs with a wide range of materials.

Featured Vacuum Casting Resources

How can I add color to polyurethane liquid materials?

We can add color by using a color pigment or painting the casted parts.

What does 'Shore Hardness' mean?

Shore hardness is a measure of the hardness of a material. Shore A scale is used for soft materials. Shore Scale D on the other hand is used for rigid materials.

What is the advantage of vacuum casting?

Vacuum casting allows us to cast the parts with the same appearance quality as the production injected molded parts. Also, it can create the prototypes with intricate details and complex geometry.

Vacuum Casting Video
Vacuum Casting Technical Support
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YinCheng Road, XiaBian Community, ChangAn Town, DongGuan City, GuangDong Province, China.
sales@lcrapid.com +86-18898486814