Custom Vacuum Casting Services for Prototypes & Low-Volume Production
Production-like urethane and polyurethane parts made with custom silicone molds for functional prototypes, design validation, and low-volume production.
When Should You Use Vacuum Casting for Your Parts?
Vacuum casting is a practical choice for functional prototypes, design validation and low-volume production when you need production-like polyurethane parts before committing to hard injection molding tools. Vacuum casting prototyping is especially useful when part appearance, fit and functional performance need to be evaluated early.
Functional Prototypes
Use vacuum casting prototyping to produce realistic urethane parts for fit, form, function and performance testing. These functional prototypes can closely represent the appearance and material behavior expected from the final product.
Design & Assembly Validation
Validate dimensions, interfaces, assembly fit and product appearance with accurate polyurethane parts before final manufacturing decisions are made. This allows engineering teams to identify design issues before moving into production tooling.
Small-Batch Production
Vacuum casting is well suited to small-batch production when the required quantity does not justify hard injection molding tools. It provides a practical way to produce repeatable custom urethane parts for pilot runs, early market launches and limited production volumes.
Bridge Production
Vacuum casting can support bridge production while production tooling is being manufactured, tested or validated. This helps keep short-run parts available before the transition to full-scale injection molding.
Custom Vacuum Casting Capabilities for Complex Parts
Our vacuum casting service supports complex geometries, functional prototypes, custom urethane parts and low volume production with controlled casting, finishing and inspection.
Complex Geometry Casting
Produce custom cast urethane parts with complex features, fine details, undercuts and production-like surfaces using custom silicone molds.
Rigid, Flexible & Clear Parts
Select from polyurethane materials with different hardness, flexibility and visual characteristics to match your prototype or application.
Prototype to Low-Volume Production
Move from vacuum cast parts to low volume production casting without committing to the cost and lead time of hard injection molding tools.
Finishing & Secondary Operations
Complete urethane casting services with trimming, surface finishing, painting, assembly and dimensional inspection for finished parts.
Vacuum Casting Equipment & Production
See how our in-house mold manufacturing, vacuum casting equipment and production processes support consistent custom polyurethane parts.
Which Vacuum Casting Material Is Right for Your Part?
Choose the right vacuum casting materials according to part function, appearance, flexibility, clarity, durability, and production requirements. Our polyurethane casting materials support custom prototypes, functional validation, and low-volume production.
ABS-Like
Good all-around casting material for housings, brackets, covers, enclosures, and general functional prototypes.
- Provides an ABS-like balance of strength, stiffness, and surface appearance.
- Suitable for custom polyurethane parts requiring practical mechanical performance.
- A common choice for design validation and low-volume production parts.
PC-Like
Suitable when prototypes need a combination of toughness, rigidity, and impact resistance similar to polycarbonate parts.
- Good choice for housings and mechanically loaded prototypes.
- Supports functional testing before injection molding.
- Suitable for complex polyurethane parts requiring higher toughness.
PMMA-Like
Designed to reproduce the appearance and feel of acrylic-like production parts for prototypes and presentation models.
- Suitable for detailed housings, covers, and appearance prototypes.
- Supports smooth surfaces and fine cosmetic details.
- Useful for design and assembly validation.
POM-Like
A rigid casting material selected when prototypes need characteristics similar to engineering acetal components.
- Suitable for functional mechanisms and moving components.
- Useful for dimensional and assembly evaluation.
- Supports prototypes where stiffness and low-friction behavior are important considerations.
Nylon-Like
Suitable for prototypes requiring a balance of toughness, strength, and engineering-plastic-like performance.
- Useful for brackets, housings, clips, and structural prototypes.
- Supports functional testing before production tooling.
- Suitable for prototype and low-volume applications.
PP-Like
A practical choice for prototypes requiring a polypropylene-like combination of toughness and flexibility.
- Suitable for housings, covers, containers, and lightweight components.
- Useful for fit, assembly, and functional testing.
- Supports low-volume urethane parts before hard tooling.
Flexible Urethane
Flexible urethane resin is used for soft-touch components, seals, protective covers, and flexible prototype parts.
- Available in different hardness ranges for different applications.
- Suitable for impact absorption and flexible structures.
- Commonly used for custom urethane parts and functional prototypes.
TPU-Like
TPU-like casting materials provide flexible and resilient characteristics for parts requiring repeated deformation.
- Suitable for protective covers, seals, grips, and flexible housings.
- Useful for evaluating flexibility and fit.
- Supports prototype testing before production molding.
TPE-Like
TPE-like materials are suitable for soft and elastic prototype components where touch and flexibility are important.
- Suitable for grips, seals, covers, and soft-touch components.
- Available in different flexibility levels.
- Useful for functional and ergonomic testing.
Urethane Rubber
Urethane rubber provides elastic performance for flexible components, seals, bumpers, and protective parts.
- Good resilience and abrasion resistance.
- Suitable for repeated-contact applications.
- Available as castable urethane for prototype production.
Elastomeric Polyurethane
Elastomeric polyurethane materials provide controlled flexibility, resilience, and durability for demanding prototype applications.
- Suitable for flexible and impact-absorbing components.
- Useful where repeated deformation is required.
- Supports functional testing of flexible polyurethane parts.
60A / 70A / 90A Urethane
Different urethane hardness levels allow flexibility and compression characteristics to be matched to the application.
- 60A for softer and more flexible components.
- 70A for a balanced combination of flexibility and support.
- 90A for firmer functional parts requiring higher stiffness.
Clear Urethane
Clear urethane casting materials are selected for transparent or translucent prototype parts and visual evaluation.
- Suitable for transparent covers and housings.
- Useful for design and optical appearance evaluation.
- Can be used for detailed clear prototype components.
Clear Polyurethane
Clear polyurethane casting resin provides transparent prototype options where appearance and internal visibility matter.
- Suitable for transparent prototype housings and covers.
- Supports detailed prototype geometries.
- Useful for design and assembly evaluation.
PMMA-Like Clear
PMMA-like clear casting materials reproduce the appearance of acrylic-style transparent parts for prototype evaluation.
- Suitable for transparent appearance models.
- Useful for visual inspection and presentation prototypes.
- Supports complex transparent geometries.
Optical-Like Casting Material
Optical-like casting materials are selected when transparency, surface quality, and visual clarity are important.
- Suitable for transparent prototype components.
- Useful for visual and optical design evaluation.
- Surface finishing can be considered according to the application.
Impact-Resistant Polyurethane
Impact-resistant polyurethane casting materials are selected for parts exposed to shocks, drops, or mechanical impact.
- Suitable for protective housings and functional prototypes.
- Helps evaluate mechanical behavior before production tooling.
- Supports durable custom polyurethane parts.
Wear-Resistant Urethane
Wear-resistant urethane is suitable for components exposed to repeated contact, friction, or abrasion.
- Useful for rollers, guides, bumpers, and protective components.
- Supports functional durability testing.
- Suitable for low-volume urethane parts.
Engineering Polyurethane
Engineering polyurethane materials are selected when functional performance is more important than appearance alone.
- Suitable for mechanically functional prototypes.
- Supports strength, toughness, and dimensional evaluation.
- Useful for prototype and low-volume production applications.
High-Temperature Urethane
Higher-temperature urethane systems can be considered for functional prototypes exposed to elevated operating temperatures.
- Suitable for selected heat-exposure prototype applications.
- Helps evaluate part design under elevated-temperature conditions.
- Material selection should be based on the actual temperature range.
Flame-Retardant Urethane
Flame-retardant urethane materials are considered for prototype applications where reduced flammability is part of the requirement.
- Suitable for selected electrical and industrial prototypes.
- Material selection depends on the required flame-retardant standard.
- Testing requirements should be confirmed before production.
Elastomeric Polyurethane
Elastomeric polyurethane combines flexibility and resilience for functional parts requiring controlled deformation.
- Suitable for seals, bumpers, grips, and protective components.
- Supports repeated deformation and impact absorption.
- Useful for functional prototype and low-volume applications.
Material Selection Based on Your Part Requirements
The right polyurethane casting material depends on more than appearance. Our engineers consider part geometry, required hardness, flexibility, impact resistance, surface finish, operating conditions, and expected production quantity before recommending a casting material.
Custom Silicone Molds for Vacuum Casting
We manufacture custom silicone molds for vacuum casting based on your part geometry, resin requirements, surface finish, and production quantity. Our mold approach supports accurate reproduction, reliable demolding, and consistent low-volume production.
Two-Piece Mold
For parts with straightforward parting and demolding requirements.
Multi-Part Mold
For complex geometries requiring additional parting lines.
Core / Insert Mold
For internal cavities and difficult-to-reach part features.
Undercut Mold
For parts with undercuts that require flexible demolding.
Soft Silicone
For complex geometry and easier part demolding.
Medium-Hard Silicone
Balances mold flexibility with dimensional stability.
High-Tear-Strength Silicone
For repeated demolding and higher mold stress.
Specialty Silicone
Selected for specific resin and production requirements.
Silicone molds prepared for custom vacuum casting and low-volume production.
Silicone selection depends on flexibility, tear resistance, mold stability, part geometry, resin requirements, surface finish, and expected casting cycles. Our engineers select the silicone material and mold construction according to your specific part and production requirements.
Need a Custom Silicone Mold for Your Part?
Send us your 3D file and production requirements. Our engineers can review the mold structure, silicone selection, resin, and casting approach before quotation.
How Does the Vacuum Casting Process Work?
The vacuum casting process creates production-like parts from a master pattern by making a silicone mold and casting polyurethane resin under vacuum. After curing, the parts are demolded, finished, and inspected before delivery.
3D CAD → Master Pattern
We start from your 3D CAD data and create a master pattern using SLA 3D printing or CNC machining, depending on the required accuracy, surface quality, and geometry.
Master Pattern → Silicone Mold
The master pattern is enclosed in liquid silicone to create a flexible mold cavity. Parting lines, gates, and vents are considered according to the part geometry.
Mold Preparation
The silicone mold is opened, cleaned, positioned, and checked before casting to support proper filling and accurate detail reproduction.
Polyurethane Casting Under Vacuum
The selected polyurethane casting resin or urethane resin is mixed and poured into the silicone mold under vacuum. This helps reduce trapped air and reproduce complex geometry and surface details.
Demolding & Finishing
After curing, the part is removed from the silicone mold. Gates, flash, and excess material are trimmed, followed by any required surface finishing or secondary operations.
Inspection & Delivery
Finished vacuum cast parts are checked for dimensions, appearance, surface quality, and project-specific functional requirements before delivery.
What Controls Vacuum Casting Part Quality?
Consistent vacuum cast parts depend on the master pattern, silicone mold design, material selection, and casting control — not only the casting stage itself.
Master Pattern Accuracy
The master pattern establishes the dimensional and surface reference for the silicone mold.
Silicone Mold Design
Parting lines, gates, vents, and mold construction affect detail reproduction and filling performance.
Casting Control
Mixing, vacuum conditions, curing, demolding, and finishing influence consistency and appearance.
Need Vacuum Cast Parts for Your Project?
Send us your 3D file and part requirements. Our engineers can review the geometry, material requirements, mold approach, and production quantity before quotation.
Vacuum Casting Tolerances for Precision Parts
Vacuum casting can produce accurate, production-like parts when the master pattern, silicone mold, material, and casting process are properly controlled. Our engineers review your drawing requirements and critical dimensions before production.
How Accurate Is Vacuum Casting?
Many vacuum cast parts can achieve around ±0.15–0.30 mm for typical dimensions, depending on part size, geometry, material, mold construction, and process conditions. Tighter tolerances may require additional engineering review or secondary machining.
At SENSES MOLD, critical dimensions are reviewed from the CAD model through master pattern, silicone mold, casting, and final inspection.
For Critical Features
Mating features, mounting holes, and other functional surfaces are reviewed separately. Where tighter accuracy is required, selected features can be finished by secondary CNC machining.
What Affects Vacuum Casting Tolerances?
Master Pattern
The master pattern establishes the dimensional reference for the final vacuum cast part. Our engineers review the CAD data and master pattern requirements before mold making.
Silicone Mold
Mold construction and silicone behavior can affect final part dimensions. Mold design is reviewed according to part geometry, demolding requirements, and expected casting quantity.
Part Geometry
Thin walls, deep cavities, undercuts, and complex features require additional dimensional consideration during mold and casting planning.
Material & Casting
Resin selection, curing behavior, and casting conditions influence dimensional consistency. Material and process requirements are reviewed before production.
Can Vacuum Casting Meet My Drawing Tolerances?
It depends on the required tolerance and part geometry. Our engineers review critical dimensions, mating features, mounting holes, and other functional areas before production. When tighter accuracy is required, selected features can be finished by secondary CNC machining.
Vacuum Casting Finishing & Secondary Operations
Vacuum cast parts can be further processed after demolding to meet appearance, dimensional, and functional requirements. SENSES MOLD handles finishing and secondary operations in-house according to your part requirements.
Trimming & Deflashing
Gates, runners, flash, and parting-line material are removed after demolding. Edges and surfaces are carefully trimmed to prepare the casting for further finishing or inspection.
Surface Finishing
Sanding, polishing, and other surface treatments can be applied according to the required texture, gloss, and prototype appearance.
Painting & Color Matching
Parts can be painted to achieve the required color, gloss level, and visual appearance for product prototypes, design validation, presentation models, and low-volume parts.
Secondary CNC Machining
Selected features can be CNC machined after casting when tighter dimensional accuracy is required, including critical holes, mounting surfaces, and mating features.
From Casting to Finished Parts
Our engineers and production team coordinate casting, finishing, secondary machining, and inspection according to your part requirements.
Need Finished Vacuum Cast Parts?
Send us your 3D CAD file, drawings, quantity, and finishing requirements. Our engineers can recommend the appropriate casting and secondary operations for your parts.
How Vacuum Casting Supports More Than Prototyping
Vacuum casting can support more than a single prototype build. With custom silicone molds and polyurethane casting materials, SENSES MOLD produces repeat prototype parts, pilot and validation builds, and low-volume production parts for projects that require production-like polyurethane components in limited quantities.
Repeat Prototype Builds
Need more than one prototype for engineering evaluation or customer review? A silicone mold can produce multiple polyurethane castings from the same master pattern. This makes vacuum casting prototyping practical for repeated design iterations, assembly trials, functional testing, and approval samples.
Pilot & Validation Builds
When your project moves beyond the first prototype, you may need a larger quantity of consistent parts for pilot builds, field testing, customer validation, or pre-launch preparation. Vacuum casting provides repeat polyurethane parts while the product is still being evaluated and refined.
Low-Volume Production
For quantities that are too high for one-off prototypes but still limited in volume, small batch vacuum casting production can provide finished urethane parts for early product launches, market testing, limited releases, and selected end-use applications.
Need Repeat or Low-Volume Vacuum Cast Parts?
Send us your 3D CAD file, required quantity, material requirements, and application. Our engineers can review your project and recommend a suitable vacuum casting solution.
Vacuum Casting vs. 3D Printing, CNC Machining & Injection Molding
The right manufacturing process depends on part quantity, material requirements, surface appearance, dimensional needs, and production stage. Vacuum casting is particularly suitable when you need production-like polyurethane parts in small quantities without committing to hard production tooling.
| Comparison | 3D Printing | Vacuum Casting | CNC Machining | Injection Molding |
|---|---|---|---|---|
| Best For | Early concepts, geometry checks & rapid iterations | Functional prototypes, validation builds & low-volume parts | Precision parts and engineering components | Stable designs and higher-volume production |
| Production Volume | Very low to low volume | Prototype to low-volume | Prototype to production | Medium to high volume |
| Tooling | No dedicated tooling | Silicone mold | No dedicated mold | Production mold required |
| Surface Appearance | Depends on printing process and finishing | Smooth, production-like surfaces | Machined surface characteristics | Production-grade molded surface |
| Material Approach | Printing-specific materials and resins | Polyurethane casting materials with different properties | Real engineering plastics and metals | Production thermoplastics |
| Design Flexibility | Excellent for rapid design changes | High flexibility during prototype and low-volume stages | Depends on machining access and geometry | More dependent on mold design and DFM |
| Typical Advantage | Fast iteration without tooling | Production-like parts without hard production tooling | Tight dimensional control and real material performance | High repeatability and lower unit cost at scale |
Choose Vacuum Casting When These Requirements Matter
Production-Like Appearance
Choose vacuum casting when surface finish, color, texture, and overall appearance need to closely represent the intended product.
Multiple Functional Parts
Vacuum casting is useful when one prototype is not enough and you need repeat parts for assembly, testing, customer evaluation, or pilot builds.
Low-Volume Parts Without Hard Tooling
Vacuum casting can provide small-batch polyurethane parts without the upfront investment of a production injection mold.
Not Sure if Vacuum Casting Is Right for Your Project?
Send us your 3D CAD file, target quantity, material requirements, and application. Our engineers can review your requirements and recommend whether vacuum casting is a suitable manufacturing option.
Vacuum Casting Applications for Custom Parts
Vacuum casting applications extend from automotive and medical device prototypes to consumer electronics, industrial equipment, packaging, and robotics. SENSES MOLD produces production-like polyurethane vacuum cast parts for product development, functional validation, pilot builds, and selected low-volume applications.
Automotive
Automotive vacuum casting supports prototype parts, fit-and-finish evaluation, assembly trials, and functional testing before production tooling is committed.
Medical Devices
Medical device vacuum casting is used for equipment housings, handheld device prototypes, ergonomic evaluation, and appearance and assembly validation.
Consumer Electronics
Consumer electronics prototype casting provides realistic enclosures, covers, buttons, and housings for fit checks, appearance review, and functional product testing.
Industrial Equipment
Industrial vacuum cast parts are suitable for equipment housings, covers, control panels, and functional prototypes requiring production-like geometry and appearance.
Consumer Products & Packaging
Cosmetic packaging vacuum casting helps brands evaluate product shape, appearance, color, texture, and assembly before larger production tooling is released.
Robotics & Automation
Vacuum casting for robotics and automation provides lightweight housings, covers, and functional prototype parts for assembly testing and product development.
Need Vacuum Cast Parts for Your Application?
Send us your 3D CAD file, target quantity, material requirements, and application. Our engineers can review your project and recommend a suitable vacuum casting solution.
How We Control Vacuum Casting Quality
SENSES MOLD controls vacuum casting quality through defined engineering, mold, casting, inspection, and final release checkpoints. Inspection requirements are matched to your drawings, critical features, material requirements, and intended application.
Drawing & CAD Review
We review the latest CAD model, drawing revision, critical dimensions, mating features, appearance requirements, material specifications, and inspection expectations before production planning.
Master Pattern Verification
The master pattern is checked for dimensional accuracy, surface condition, important features, and visible defects before silicone mold making.
Silicone Mold Inspection
Mold construction, parting lines, gates, vents, inserts, mold condition, and demolding risks are reviewed to help reduce air entrapment, incomplete filling, flash, and demolding damage.
Casting Process Control
Resin identity, material batch, mixing, degassing, casting, curing, and demolding requirements are controlled according to the selected polyurethane casting material and project specifications.
Dimensional & Visual Inspection
Critical dimensions, mounting holes, mating surfaces, appearance, bubbles, sink marks, flash, parting lines, color, and surface condition are checked according to agreed inspection requirements.
Final Quality Release
Before shipment, we confirm the accepted part revision, quantity, inspection status, finishing requirements, packaging condition, and agreed quality documents required for the project.
Need Vacuum Cast Parts with Defined Quality Requirements?
Send us your 3D CAD file, drawings, critical dimensions, material requirements, and inspection expectations. Our engineers can review the project and define a suitable quality control approach.
Why Choose SENSES MOLD for Vacuum Casting?
SENSES MOLD provides factory-direct vacuum casting for overseas OEM projects, combining engineering support, polyurethane casting, finishing, and inspection under one manufacturing team.
Factory-Direct Vacuum Casting
Work directly with our China manufacturing team instead of coordinating through a sourcing platform or multiple suppliers. Your vacuum casting project is managed directly with the factory responsible for production.
In-House Engineering Support
Our engineers review your 3D CAD data, part geometry, material requirements, mold approach, and production quantity before casting begins, helping identify potential manufacturing issues early.
Casting, Finishing & Inspection
Vacuum casting is supported by coordinated finishing and inspection, including trimming, surface finishing, painting, secondary machining, and dimensional checks according to your project requirements.
OEM Project Support
We support overseas OEM customers from quotation and engineering review through prototype builds, low-volume production, finishing, inspection, and shipment with direct project communication.
Ready to Start Your Vacuum Casting Project?
Send us your 3D CAD file, quantity, material requirements, and application. Our engineering team can review your project and prepare a suitable vacuum casting solution.
Comprehensive Vacuum Casting Guide
Explore practical vacuum casting guides covering the process, materials, design, silicone molds, tolerances, inspection, cost, production volume, process comparison, and OEM supplier selection.
Vacuum Casting Fundamentals
Materials & Part Performance
- Vacuum Casting Materials: How to Choose the Right Material →
- Polyurethane Casting Resin: Types, Properties & Applications →
- Rigid vs. Flexible vs. Clear Vacuum Casting Materials →
- Cast Urethane Material Properties: Hardness, Flexibility & Durability →
- Can Vacuum Casting Parts Match Production Plastic Performance? →
Design, DFM & Silicone Mold
Tolerances, Shrinkage & Inspection
Cost, Mold Life & Production Volume
Process Comparison, Suppliers & OEM Production
- Vacuum Casting vs. 3D Printing: Which Is Better for Prototypes? →
- Vacuum Casting vs. CNC Machining: Which Is Right for Your Part? →
- Vacuum Casting vs. Injection Molding: Which Process Should You Choose? →
- How to Choose a Vacuum Casting Supplier for OEM Parts →
- How to Find a Vacuum Casting Manufacturer in China →
Still Not Sure Which Vacuum Casting Solution Fits Your Part?
Our engineers can review your part geometry, material requirements, tolerance, quantity, finishing requirements, and application to help determine a practical vacuum casting approach.
Frequently Asked Questions About Vacuum Casting
Find practical answers to common OEM questions about vacuum cast parts, CAD files, inserts, finishes, sampling, functional applications, and quoting.
Yes. Vacuum cast parts can be produced in different colors, surface finishes, textures, and appearance requirements. Color can be matched according to a reference sample, color specification, or approved standard when required.
Additional finishing options such as painting, surface treatment, trimming, polishing, and other secondary operations can also be considered depending on the part geometry and application. This makes vacuum casting suitable for both functional prototypes and appearance-critical product samples.
Yes. Vacuum casting can incorporate metal inserts, threaded features, mounting hardware, and other secondary features when they are suitable for the part design and application.
Insert requirements should be identified in the 3D CAD model or engineering drawing so our engineers can review insert placement, positioning, bonding, mold access, and assembly requirements before production.
In some cases, a silicone mold can be modified or adjusted after initial castings, depending on the required design change, mold construction, and location of the feature.
Small adjustments may be possible without creating a completely new mold, while major geometry changes may require a new master pattern or silicone mold. We review the requested modification against the existing mold structure before recommending the most practical solution.
Yes. Vacuum casting can be used to produce replacement parts, spare parts, discontinued components, and limited-quantity custom parts when conventional production tooling is not practical or economical.
It can be particularly useful when only a small quantity is required and the original production mold is unavailable. A suitable master pattern can be created from available CAD data, an existing part, or other engineering references before silicone mold making and casting.
Yes. Sample or initial casting quantities can be produced before proceeding with a larger vacuum casting order. This allows the part design, appearance, assembly, material, and finishing requirements to be reviewed before the remaining quantity is produced.
For OEM projects, sample approval can also help confirm critical features and customer-specific requirements before moving into repeat or low-volume production.
Common 3D CAD formats such as STEP, STP, IGES, and other standard solid or surface formats can be used for vacuum casting projects. A 3D CAD model provides the primary geometry reference for engineering review and master pattern preparation.
Engineering drawings are also useful when the project includes critical dimensions, tolerances, material requirements, surface specifications, inserts, or other features that cannot be fully defined by the 3D model alone.
Yes. Vacuum cast parts can be used for functional testing, assembly validation, ergonomic evaluation, field testing, pilot builds, and selected low-volume end-use applications.
The suitability of a vacuum cast part for functional or end-use applications depends on the selected polyurethane material, required mechanical properties, operating conditions, part geometry, expected quantity, and service environment. Material and application requirements should therefore be reviewed before production.
To prepare a vacuum casting quote, provide your 3D CAD file, required quantity, material or performance requirements, finishing requirements, and application information when available.
Engineering drawings are recommended when the part has critical dimensions, specific tolerances, inserts, threaded features, color requirements, or inspection criteria. Additional information about the target quantity and application helps our engineers recommend a suitable silicone mold and casting approach.
Have a Vacuum Casting Requirement Not Covered Here?
Send us your 3D CAD file, drawings, required quantity, material requirements, and application. Our engineers can review your project and help determine a suitable vacuum casting solution.