Vacuum Casting Service

We offer cost-effective vacuum casting products and parts prototyping and low-volume manufacturing services.

Vacuum Casting

Vacuum Casting

Vacuum casting is a type of casting process, which is a great way to create a prototype when you need multiple parts or multiple colors. The process produces cast polyurethane parts that are low cost and have properties similar to injection-molded thermoplastics. It is also known as urethane casting or silicone molding.

Vacuum Casting Technical Specifications

Standard Lead TimeUp to 10 copies within 14 days
Standard Tolerance±0.3% (with a lower limit on ± 0.3 mm on dimensions smaller than 100 mm)
Minimum Wall ThicknessTo 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 DimensionsThe 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 QuantitiesUp to 25 copies per mold (depending on the mold’s complexity and the casting materials)
Surface StructureHigh-quality surface finish comparable to injection molding

What is Vacuum Casting

Vacuum casting, also known as urethane casting, is a quick, cost-effective method for producing prototype parts and low volume plastic parts in small quantities.

This process is ideal for companies that need functional prototypes or production-quality parts without having to invest in tooling or expensive, time-consuming 3D printing processes.

With vacuum casting, you can order anywhere from 5 to 500 parts at a time and have them delivered within 2 weeks of receipt of an approved 3D model.

Vacuum Casting Process - How Does it Work

A master model or pattern is produced by whatever means is appropriate for the material it will be made from (such as CNC machining, stereolithography, etc.). This master model forms one half of the mold and it contains all the details of the part you wish to reproduce. Using this master, a silicone rubber mold is created by injecting two-component silicone rubber into the cavity around the master model. Once this has cured a rigid outer mold box is attached and then filled with two-part liquid urethane resin. The vacuum chamber draws air through the resin and out of the molds curing chamber, reducing air bubbles in the finished castings. After a few minutes the silicone rubber can be stripped away to reveal up to 20 cast parts from each mold, depending on its size and complexity.

Advantages of Vacuum Casting

Materials for Vacuum Casting

Polypropylene (PP) like (80D)
Polycarbonate (PC) like (75D)
Acrylonitrile Butadiene Styrene (ABS) like (83D)
PE-like (65D)
Thermoplastic Polyolefins (TPO or TPE-O) like
Talc-Filled Polypropylene like
Glass-Filled Nylon like
Thermoplastic Polyurethane (TPU) like
Fire-Retardant (FR) PU like (78D, 80D, 85D)
High Impact (85D, 88D, 80D – 90D)
Polyamide (PA) like (80D)
Acrylonitrile Butadiene Styrene (ABS) + High Density Polyethylene (HDPE) like (70D)
Elastomer like (60A, 65A, 70A, 90A, 95A)
Polyurethane (PUR or PU) like (25A, 30A 40A, 50A, 60A, 70A, 80A, 84D, 85A, 90A)

Surface Finish Options for Vacuum Casting Parts

Surface finish is applied to parts after they have been machined to create a unique surface layer to meet the hardness, chemical resistance, and appearance requirements of the products. It depends on material properties and the application of the part. LEADRP offers the following finishing options for injection molded parts services:

Alternaltives for Vacuum Casting

LEADRP applies a variety of vacuum casting techniques and equipment to improve the speed and ability to cope with your prototyping and mass production applications. But, For vacuum casting product and parts with tight tolerance requirements, CNC machining or injection molding will be a better choice.

Vacuum Casting Samples



At LEADRP, we use a variety of rapid prototyping techniques to produce engineering parts, prototypes, and complete working products. Since starting our business in 2006, we have put a lot of effort into our facilities and people to offer more competitive services than many other companies in rapid prototyping and manufacturing.

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Quick Response

With experienced engineering and operations team to help you with instant quotations, production, and delivery.

Rich Industry Experience

We help to dealing with varying requirements of material and tolerance in the most challenging industries since 2006 .

Quality Guarantee

As an ISO certified company, we always ensure our products and services comply with international standards.

How We Works

Instant Quote

Send us 2D & 3D design files, then get free DFM feedback and quotes in a few hours.


Once the quote and order are confirmed, production starts in a few hours.

Delivery & Receive

After passing quality inspections, the parts are carefully packed and ready for shipment.

Served Industries

LEADRP is a leading provider of rapid prototyping service and low-volume manufacturing service for mission-critical applications in the Aerospace, Automotive, Medical & Life Science, Oil & Gas, Food and Beverage industries, Semiconductor and more.


Bracket, turbines, handles, and more.


Grills, handles, decos, and more.


Sculptures, mockups, and more.


Dental, implants, surgical models, and more.

Consumer Products

Household, electronics housings, and more.


Polyurethanes, die castings, chemical resistance parts, and more.

Oil and Gas

Fluoropolymer, silicone rubbers, and more.

Food and Beverage

Food-grade plastics and engineering polymers, and more.

We make your custom products better and faster

LEADRP could help you with all the important and complex work of custom product prototyping and manufacturing, from initial designs to low-volume production, post-processing, logistics, and more. LEADRP is dedicated to speeding up your prototyping and manufacturing processes and reducing costs. Whether it's a one-off prototype made or a batch production of thousands, LEADRP is here to help.

  All uploads are secure and confidential, check our IP Protection Policy. If it prompts that the file format does not support uploading, please compress the file into a zip file before sending it.

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We make your custom products better and faster

Whether it's a one-off prototype made or a batch production of thousands, LEADRP is ready to support your project. Just tell us your project, and we will contact you within 12 hours.

All uploads are secure and confidential, click to check our IP Protection Policy. You can also contact us ( to sign a NDA before sending any design files to us. If it prompts that the file format does not support uploading, please compress the file into a zip file before sending it.