Vacuum Casting for Low-Volume Plastic Parts

Vacuum casting is a manufacturing process used to produce low-volume plastic parts with high detail and good surface finish. At 6 CNC, we provide vacuum casting services for projects that require fast turnaround, consistent appearance, and cost-effective small-batch production.

This process is ideal for bridge production between prototyping and injection molding.

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When Vacuum Casting Is the Right Choice

Vacuum casting works best when you need:

Low-volume production (typically 10–100 parts)
High-quality appearance and surface finish
Faster lead time than injection molding
Lower tooling cost compared to mass production

If your project requires high-volume output, injection molding is more efficient.
If your part requires tight tolerances or mechanical strength, CNC machining may be a better choice.

Surface Quality and Detail in Vacuum Die Casting

Product housings manufactured using the vacuum die-casting process

Typical Vacuum Casting Applications

Vacuum casting is widely used for:

Functional prototypes with improved surface quality
Small-batch plastic parts for market testing
Enclosures and housings
Consumer product samples
Medical and industrial device components

This process delivers consistent parts with good detail, making it suitable for both validation and early-stage production.

Materials and Capabilities

We use polyurethane resins to simulate a range of plastic materials.

Available options include:

ABS-like materials for general applications
Rubber-like materials for flexible components
Transparent resins for visual or optical parts

These materials allow you to test form, fit, and appearance before moving to full production.

Surface Quality and Detail in Vacuum Casting

Vacuum casting provides smoother surfaces and finer detail compared to many rapid prototyping methods.

This is especially useful for:

Cosmetic parts
Transparent or semi-transparent components
Parts requiring consistent visual quality

You can achieve production-like appearance without investing in injection molds.

From Prototype to Production

Vacuum casting is often used as a bridge between 3D printing or CNC prototyping and injection molding. We help you validate your design and prepare it for mass production. By aligning your prototype with production requirements early, you reduce risk and avoid redesign.

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Delivery Times and Cost-Effectiveness of Vacuum Casting

Vacuum casting offers shorter lead times compared to injection molding because it uses silicone molds instead of steel tooling.

This reduces upfront cost and allows faster iteration.
It is an efficient solution when you need multiple parts quickly without committing to large-scale production.

Silicone molds for manufacturing plastic products

A Practical Approach to Small-Batch Production

Choosing the wrong process can increase cost and delay your project. We help you select the most efficient manufacturing method based on your volume, material requirements, and performance needs. Vacuum casting is a practical solution when you need speed, flexibility, and consistent appearance in small batches.

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FAQ About Vacuum Casting

What is vacuum casting used for?

Vacuum casting is used to produce low-volume plastic parts with good surface finish and detail, often for prototyping and small-batch production.

How many parts can be made with vacuum casting?

Vacuum casting is typically used for 10 to 100 parts, depending on mold life and material requirements.

How accurate is 3D printing?

3D printing accuracy depends on the process and material.
It is generally less precise than CNC machining.

What materials are available for 3D printing?

Common materials include resins and engineering plastics.
Material selection depends on your application and testing needs.

Should I choose CNC machining or 3D printing?

3D printing is faster for early-stage prototypes.
CNC machining is better for functional testing, precision parts, and production.