Vacuum Casting
   -- Great Choice To Make 5-30 Copies
At Unique Prototype, we have a dedicated team of mold makers who are experts at creating vacuum casting molds which offer fine surface details while being robust enough to make up to 30 copies per mold with short lead times.
What Is Vacuum Casting?
Vacuum casting is a low-cost but reliable method for making a small number of high-quality prototypes based on a master model, created by CNC machining or one of our rapid prototyping services.

This method is ideal for rapid prototyping used in engineering testing, proof-of-concept and display demos. 
Advantages Of Vacuum Casting
Vacuum casting is an ideal choice for rapid prototyping because:
•    There is a low initial cost since it doesn’t require investment in tooling
•    The high fidelity of the mold gives excellent surface details 
•    Many different molding polymers are available that can be pigmented to       meet your color requirements
•    Molds can be ready soon once the master model has been created
•    Molds are durable up to approximately 30 copies so it’s great if you               need more than one copy
•    It is an excellent option for testing multiple variations of a prototype design for rapid product development
Process of Vacuum Casting
The process steps can be summarized as:
1.    Make a solid master model that should be able to withstand a temperature of 40° C.
2.  Suspend this master model inside of a casting box, which we half-fill with liquid silicone rubber. 
3.  Place the box inside of a curing oven until the silicone is fully cured.
4.  Fill the casting box with additional silicone liquid which is also heated and cured. 
5.   Open up the silicone rubber mold along the parting line and remove the master, a hollow cavity left.
6.   Place a series of fine holes surrounding the master pattern.

7.   Fill the cavity with any number of molding polymers to suit your design requirements.  
8.   Place them into a vacuum chamber which draws air out of the cavity and pulls the liquid plastic into all of the recesses of the mold.
9.  Put the mold into a curing oven one more time, creating a solid and stable replica of your original master pattern.
Tolerances of Vacuum Casting Parts
The finished dimensions of vacuum cast parts is dependent on the accuracy of the master model, part geometry and casting material. In general, a shrinkage rate of 0.15% is to be expected.
Materials of Vacuum Casting
Hundreds of casting polymers are commercially available to reproduce any conceivable hardness and surface texture.  It is also possible to make parts that are fully opaque, translucent or completely transparent depending on your application. 



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