Vacuum Casting Services
Vacuum Casting Services for Prototypes and Low-Volume Production
Replicate production-quality parts with excellent surface finish and material flexibilit, ideal for design validation and short-run manufacturing.
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What is Vacuum Casting?
Vacuum casting is a rapid manufacturing method used to produce high-quality prototypes and low-volume end-use parts. It involves creating a silicone mold from a master pattern, then using vacuum pressure to cast parts in polyurethane resin. The result is production-like components with fine surface finish, dimensional stability, and material diversity—without the high cost of injection mold tooling.
Vacuum casting bridges the gap between 3D printed prototypes and full-scale manufacturing. It’s especially suited for design validation, marketing samples, user testing, and niche production runs.
- Rapid Prototyping
- Low-Volume Production
Rapid Prototyping
EZRA Rapid Prototyping
High-quality cast parts for custom design validation
Each silicone mold can produce up to 50 accurate and detailed vacuum cast parts. Perfect for concept models, form-fit-function prototypes, and visual validation before mass production.
Low-Volume Production
Production
Flexible short runs with fast tooling turnaround
Vacuum casting supports rapid delivery of end-use parts with low-cost molds. Ideal for bridge production and small batch needs with frequent design iterations.
Vacuum Casting Materials
We offer a wide selection of casting resins that simulate ABS, PC, PP, and rubber-like materials. You can choose based on hardness, flexibility, color, or transparency. Great for realistic functional parts and appearance models.
Colors & Surface Finishes for Vacuum Casting
We offer matte or glossy finishes based on SPI or VDI standards, combined with a range of color options including standard, transparent, or custom-matched shades. Color is added during casting or post-processing, depending on resin type and finish requirement. For painted parts, please confirm gloss level and texture grade (e.g., SPI-B1 or VDI 24) before production.
Standard Black
A timeless and professional look that suits most functional prototypes and mechanical parts.
Transparent
Maintain internal visibility for optical components or parts requiring internal inspection.
Pure White
A clean and minimal appearance, perfect for modern industrial design and cosmetic models.
Custom Color Matching
Match any Pantone or RAL color to meet your brand or product specifications precisely.
SPI Mold Finish
SPI is a polishing standard commonly used in vacuum casting to define surface smoothness. Grades range from mirror gloss (A1) to matte textures (D3). It’s ideal for parts requiring clear surfaces, cosmetic appearance, or tight tolerances.
VDI Texture Standard
VDI defines EDM surface textures often applied in vacuum casting. Popular levels like VDI 18–24 provide uniform matte finishes, help hide marks, and are widely used for enclosures, buttons, and mechanical housings.
Vacuum Casting Capabilities
Vacuum Casting Capabilities
- Accuracy
- Maximum Part Size
- Minimum Wall Thickness
- Typical Mold Lifespan
- Color & Surface Options
- Typical Lead Time
US
- Accuracy
- ±0.002 in
- Maximum Part Size
- ±0.001 in
- Minimum Wall Thickness
- 0.06–0.1 in
- Typical Mold Lifespan
- 20–25 parts per mold
- Color & Surface Options
- Custom colors, textures, and finishes available
- Typical Lead Time
- Up to 20 parts within 15 days
Metric
- Accuracy
- ±0.05 mm
- Maximum Part Size
- ±0.025 mm
- Minimum Wall Thickness
- 1.5–2.5 mm
- Typical Mold Lifespan
- 20–25 parts per mold
- Color & Surface Options
- Custom colors, textures, and finishes available
- Typical Lead Time
- Up to 20 parts within 15 days
Why Teams Choose Ezra Over Platforms
Standard
- Free DFM + Material Suggestion
- Complex Geometry Support
- Transparent & Rubber-like Materials
- Consistent Texture & Color Control
- No MOQ
- Parts Ready in 5–7 Days
- Paint, Silk Print, and Coating Options
- VDI / SPI Texture Selection
- In-house Mold Maintenance
- Dedicated Engineer Support
- Online Instant Quoting
- Free DFM + Material Suggestion
- Complex Geometry Support
- Transparent & Rubber-like Materials
- Consistent Texture & Color Control
- No MOQ
- Parts Ready in 5–7 Days
- Paint, Silk Print, and Coating Options
- VDI / SPI Texture Selection
- In-house Mold Maintenance
- Dedicated Engineer Support
- Online Instant Quoting
Competitor
- Free DFM + Material Suggestion
- Complex Geometry Support
- Transparent & Rubber-like Materials
- Consistent Texture & Color Control
- No MOQ
- Parts Ready in 5–7 Days
- Paint, Silk Print, and Coating Options
- VDI / SPI Texture Selection
- In-house Mold Maintenance
- Dedicated Engineer Support
- Online Instant Quoting
Industries We Serve
EzraMade’s clients come from multiple industries. Whether you produce medical devices, cars, or consumer goods, you'll find us to be a reliable injection molding partner. Our injection molding services are designed for ultimate predictability in costs and quality.
Work Seamlessly with Our Expert Engineering Team
We’re a direct manufacturing partner with in-house capabilities and real technical support — ready to support your product through every stage.
A Full-Service Team Working With You
Engineers support you from quoting through DFM to production — every step led by people who understand the process.
- Expert guidance from real engineers
- Support for DFM, sourcing, and project coordination
- Fast-response service via chat, email, or phone
Factory Pricing at Scale
Our in-house production means lower costs, better control, and no middleman markups when you scale up.
- Consistent pricing from prototype to production
- No surprise fees or supply chain handoffs
- Built-in savings on large-volume orders
Post-Processing Included
From finishing to assembly to packaging, we take care of the final steps so your parts arrive ready to use.
- Surface finishing like painting and plating
- Sub-assembly and part fitting
- Export packaging and labeling
Flexible Manufacturing
From prototyping to low-volume runs to mass production — we adjust to your needs, with no fixed MOQs.
- Prototyping to production in one place
- No minimum order required
- Easy to scale when you're ready
Tell us about your project!
Vacuum Casting FAQs
What is vacuum casting and how does the process worka?
Vacuum casting is a low-volume manufacturing process used to produce high-fidelity plastic parts. It starts with a master model—usually 3D printed—followed by silicone mold making under vacuum to avoid air bubbles. Once the mold cures, it is used to cast urethane or similar resins under vacuum again, ensuring bubble-free, detailed replications. Each silicone mold typically supports 20–50 parts, making the process ideal for prototypes, fit tests, or functional runs.
What materials are available for vacuum casting?
The most common vacuum casting materials are polyurethane-based resins, formulated to simulate ABS, PP, PC, rubber, or even transparent plastics like PMMA. Flame-retardant and high-temperature options are also available. These casting resins can mimic injection molding-grade materials while providing faster lead times and lower tooling costs. Material selection depends on end-use performance, such as flexibility, strength, or thermal resistance.
How does vacuum casting compare to 3D printing?
Vacuum casting offers better surface finish, stronger mechanical properties, and consistent results across multiple parts compared to typical 3D printing technologies. While 3D printing is faster for single prototypes, urethane casting is more cost-effective for runs of 10–100 parts. Additionally, vacuum-cast parts can be tinted or textured directly in the mold, reducing the need for post-processing.
How is vacuum casting different from injection molding?
Injection molding is more suitable for high-volume production (1,000+ units) due to durable metal tooling. Vacuum casting, in contrast, is optimized for low-volume production or bridge tooling. It uses silicone molds with a lifespan of 20–50 cycles, reducing lead time and setup cost. Vacuum casting allows faster design validation without the upfront investment required by steel molds.
What part sizes and geometries can be produced with vacuum casting?
Vacuum casting is flexible for part sizes ranging from a few millimeters up to ~1 meter, depending on the vacuum chamber and mold size. Complex geometries with undercuts can be accommodated using multi-part molds or inserts. However, thin walls (<1 mm), extremely sharp corners, or unsupported long spans may present challenges during casting or demolding.
What tolerances can be expected from vacuum casting?
Typical tolerances for vacuum-cast parts are ±0.1 mm to ±0.8 mm, depending on the part size, geometry, and material shrinkage. For higher precision, it’s essential that the master model is dimensionally accurate, as the mold will replicate every detail. Silicone molds are softer than metal tools, so dimensional drift may occur over time after multiple castings.
How many parts can be made from one silicone mold?
On average, a single silicone mold can produce between 20 to 50 parts, depending on the complexity, resin type, curing temperature, and handling. Abrasive or high-temp resins tend to reduce mold life. For large or high-precision projects, multiple molds are often prepared from the same master.
Can vacuum casting parts be used for functional testing?
Yes. With proper material selection (e.g., impact-resistant, heat-resistant, or flexible resins), vacuum-cast parts can serve in functional tests. Applications include enclosures, covers, brackets, and even working prototypes in medical or consumer electronics. However, for structural load-bearing parts, additional validation is recommended.
What design tips are recommended for vacuum casting?
Stick to basic injection molding principles: keep wall thickness between 1.5–3.5 mm, apply at least 1° draft to vertical walls, avoid sharp internal corners by using smooth radii, minimize undercuts unless manual demolding is acceptable, and plan visible parting lines on cosmetic surfaces. For prototypes converted from 3D prints or CNC, our team can adjust designs for better moldability and durability.
