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Vacuum Casting

Experience precision and efficiency with our vacuum casting service. From prototypes to production parts, we deliver exceptional quality every time.

Vacuum Casting Services

Vacuum casting, ideal for prototypes, one-offs, and small batches, mimics injection molding properties effectively. Mainly used for molding two-part polyurethane (PUR), it offers a wide array of grades, colors, transparencies, and densities. Silicone molding is a popular prototype casting method, offers quick turnaround, low cost, and minimal processing risks. With just one silicone mold, it can produce over 20 identical products. Material options include ABS, PP, PC, PMMA, high-temperature resistant materials, flexible adhesive, and silicone rubber.

What is Vacuum Casting?

In stage one, the liquid PUR is drawn into the mold which is held under vacuum. This ensures that the material has porosity, will flow through the mold cavity and will not be restricted by air pressure. The PUR is held high above the mold, so as it is poured into the mold and runs underneath gravity forces it to rise upwards. The runner is designed to supply a curtain of liquid PUR. It flows through the mold and up the risers in part A. There are lots of risers to ensure that the mold is evenly filled.

After a few minutes, the mold cavity is filled and the vacuum equalized. The mold is left closed for the complete curing time, which is typically 45 minutes to four hours. In stage two, the part is ejected and the flash, risers and excess material are removed.

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vacuum casting demolding
vacuum casting cutting
vacuum casting machine

Advantages of Vacuum Casting

Cost-Effective Prototyping

Vacuum casting is an economical solution for creating prototypes compared to traditional methods like injection molding.

Fast Turnaround

It offers rapid turnaround times, making it ideal for quickly iterating and testing designs.

Low Volume Production

Vacuum casting is well-suited for low-volume production runs, providing flexibility in manufacturing small batches of products.

Material Variety

It supports a wide range of materials, including various grades of polyurethane (PUR), allowing for the replication of different material properties.

Surface Finish Quality

Vacuum casting produces parts with high-quality surface finishes, minimizing the need for post-processing.

Complex Geometries

It can replicate intricate and complex geometries accurately, ensuring that prototypes closely resemble final products.

Minimal Tooling Costs

Compared to injection molding, vacuum casting requires minimal tooling, reducing initial setup costs.


Vacuum casting allows for easy customization of parts, enabling tailored solutions to meet specific project requirements.

Ready to Start Your Next Project?

Quick to Know How Vacuum Casting Working

Master Pattern Creation

Make a master pattern, often via 3D printing or machining.

Mold Making

Create a silicone mold around the pattern.

Mold Preparation

Cut and clean the mold halves.

Material Selection

Select casting material like polyurethane or silicone.

Vacuum Degassing

Remove air bubbles from the material in a vacuum.


Pour the material into the mold.


Let the material solidify.


Open the mold and take out the part.


Trim, sand, paint, or assemble the part as needed.

The mold can be reused multiple times to create additional parts, making vacuum casting a cost-effective solution for producing small to medium quantities of high-quality prototypes or end-use parts.

Overall, vacuum casting offers a versatile and efficient way to produce complex parts with excellent surface finish and detail resolution, making it a popular choice for rapid prototyping and low-volume manufacturing applications

Check the video and pictures to help your understand more about vacuum casting processes.

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pouring silicone
vacuum degassing