Vacuum Casting is a prototyping process that enables you to produce photorealistic parts, closely resembling a plastic injection molding in a matter of days.
We can also color and texture the parts in mold and provide other post processing services, such as painting and plating. We use high quality polyurethane formulations meant to simulate the material properties of real plastic resins such as Nylon, ABS, PC, POM and more. View materials >>
Advantages of Vacuum Casting
- Perfect for making functional prototypes and market testing.
- Economical for producing small batch runs of parts to validate your design before scaling up to injection molding.
- Fantastic resolution and detail, simulating injection molding.
- Silicone rubber parts with a range of shure hardness’s available.
- Over molding possible.
We produce a model using Stereolithography (SLA) according your 3D CAD data.
2. Model Finishing
We carefully remove supports from the model, sand the part, and apply the desired surface texture.
3. Make a Silicone Rubber Tool
According to the customer’s recommendation about the gate location, build a custom sized box based on the customer’s part size and suspend the master model in the box.Then pour thoroughly mixed RTV silicone into the box with the part suspended inside after that cure it for overnight.
4. Removing the Mold
After curing is complete, disassemble the box, and carefully remove the tool based according the agreed parting line. Create ridges in the tool as removing the tool to facilitate alignment during the casting process. The master model is then removed from the tool, leaving with a completed silicone mold.
5. Mold Curing
To ensure the silicone mold core and cavity fully cured, bake the mold for another few hours. This will increase the mold life and ensure that there will be no visual defects on the casted parts. After curing, tiny pin sized holes are placed in the tool to facilitate the removal of air bubbles.
6. Casting PU
After fully cured of mold, mix the vacuum casting material thoroughly and pour into the mold using a funnel. After pouring the material, machine pulls vacuum, which compress air bubbles. Upon release of the vacuum the bubbles quickly expand and vent out of the mold through vent holes. The part then cured in the oven.
Carefully demold the part after curing. During de-molding, excess flash,sprue, and vent risers will be carefully removed from the part.
After deflashing, the parts are either ready to use or prepared for post finishing processes such as painting, vacuum metalizing (Plating), or any other required process.
9. Quality Control and Delivery
Our quality technicians then perform a final inspection before sending parts to our shipping department where we carefully pack the parts for final delivery.