Vacuum casting or polyurethane casting is a popular and cost effective rapid prototyping technology in China, usually to create more than one duplicates of your design idea. It is a cheaper technology than steel or hardened moulds and thus an excellent technology to create marketing and models to verify function and or ease of assembly
From an original prototype made by CNC machining or milling, SLS , SLA or FDM a mould will be build using this original a box ( sometimes of Transparent PMMA perspex plates or even Lego bricks and silicone).
This silicone will be poured around the original in this box.
Later the silicone mould will be cut in half , the original will be taken out and a mould with one empty cavity has been made. Important is to create a the right parting line, that is where the two molds will be come together.
This silicone mould can now be used to create new prototypes by pouring a PU resin in the mould. 20 to 25 duplicates can by made with one mould.
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