Vacuum Casting Service China | Urethane Casting

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What is Vacuum Casting?

Vacuum Casting is a precision casting process that combines vacuum degassing with silicone molds, specifically designed for low-volume production of high-precision, high-surface-quality replicated parts.

Core advantage

1:1 detail replication: Precisely recreates 0.1mm textures and complex structures

Diverse materials: 200+ types of engineering resins (hardness Shore A30-D90)

No minimum order quantity: Can be made individually, delivered within 3-5 days

No air bubbles in vacuum: Surface finish Ra1.6μm (optional mirror finish/ matte finish)

Advantages Of Vacuum Casting

Fast turnaround

QSY can provide up to 20 parts in 15 days or less, depending on part specification and volume.

Affordability

Silicone molds are less expensive than the tooling used for injection molding, resulting in low prices.

Capable of producing large parts

Depending on the type of equipment used, vacuum casting can create very large parts.

Color options

Coloring pigments can be added to the resin for a variety of color options.

Material Selection for Vacuum Casting

In CNC precision processing, the selection of materials directly affects the performance, processing difficulty and final quality of the parts. The following are the characteristics of common CNC processing materials:

Polyurethane Resin (PU Resin)

Characteristics:

Wide hardness range (Shore A 30-D 80)

Can simulate the properties of engineering plastics such as ABS, PP, and PC

Supports color matching and transparency adjustment

Special Function Resins

Characteristics:

for a short period), used for components in the engine compartment

Transparent optical resin: Transmittance > 92%, refractive index 1.51, substitutes for PMMA

Flexible resin: Shore A 30-60, simulating the touch sensation of rubber

Silicone Rubber (Mold Material)

Characteristics:

RTV-2 Two-component Silicone:

Shrinkage rate: 0.1% - 0.3%
Mold service life: 15 - 30 times
Available in regular grade / food grade / medical grade

Post-processing of Vacuum Casting

1.Demolding and Cleaning
After curing, the mold should be gently removed to avoid tearing the silicone mold. The remaining demolding agent or prototype debris should be wiped with anhydrous alcohol or a dedicated cleaning agent to ensure the surface of the mold cavity is smooth and free of impurities. If vacuum injection molding is used, it is also necessary to check if the air channels are unobstructed.

2. Repair and Reinforcement
For minor defects (such as bubbles or cracks), liquid silicone can be used for local filling, and UV-curable glue can be used for auxiliary repair. In high-stress areas, glass fiber cloth can be adhered or reinforcement coatings can be applied to enhance the mold's tear resistance.

3. Surface Treatment
The surface stickiness is reduced through sandblasting or polishing, thereby decreasing the demolding resistance. In case of necessity, a PTFE (Teflon) coating is applied to extend the mold life, especially for materials that are prone to adhesion such as polyurethane.

4. Drying and Storage
The mold should be thoroughly dried in a cool environment (24-48 hours) to prevent mold growth due to moisture. For long-term storage, it is recommended to use a sealed bag and add desiccant, and keep it away from ultraviolet rays to avoid aging.

5. Performance Testing
Before the first use, a mold test is required to check the dimensional accuracy and demolding effect. Record the shrinkage rate and detail reproduction rate to provide data for subsequent process adjustments.

Applications of Vacuum Casting

Rapid Prototyping

Low-cost tooling allows molded parts to be produced very rapidly and cost-effectively.

Production Parts

Molding is best known for its unmatched production capabilities from thousands to millions of identical parts.

Range of Industries and Certifications

We offer ISO9001; ISO14001 & IATF16949.

How to Work With Us

Upload a CAD File

To start, simply select a manufacturing process and upload a 3D CAD file.

Get Quote with DFM

Within a few hours we'll send you design for manufacturability (DFM) analysis and real-time pricing.

Manufacturing Begins

Once you review your quote and place your order, we'll start the manufacturing process. We also offer finishing options.

Parts are Shipped!

Our digital manufacturing process allows us to produce parts in as fast as 1 day.

TESTIMONIALS

The prototypes arrived this morning and they look great. Thank you very much for your work on this project and your prompt and thorough communication. We will certainly be in contact again in the future.

—— Gareth Lauchlan, BDes ID

I would Like to congratulate you and your company with your service and prototyping quality. The communication with our company was very clear and constructive.

—— Marc E.J. Van

I do appreciate the time and effort you have put forth and I would love to do business with you in the future. I’ll keep you posted very soon.

—— Roy Navi & Technical Manager

Blog

June 4, 2020

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