PU or polyurethane casting by China Prototyping Center
We offer low volume production by Polyurethane casting or vacuum casting (RTV)
PU resin casting is a prototyping technology used when you need a small series or short run of your 3d cad model made out of a PolyUrethane with properties close to real injected plastics such as ABS, POM ,PA or TPE's. Usually series of 5-100 pieces will be run.
The process:
The first step of PU Casting process involves encapsulating/enclosing a master model in a liquid Silicone rubber. Than a vacuum is applied to the mould. The mould is then cured in an oven at around 70°C
Once cured the mould can be split up in 2 or more parts, at which point the master model is removed leaving a mould cavity perfectly replicating the master model.
what is possible with vacuum casting?;
We can make double or triple shot products, we can cast rubber or TPE or TPR like materials. (with 20-80 shore A hardness)
We can vacuum cast optical clear plastics ( same like PMMA)
WHAT ARE THE ADVANTAGES OF PolyUrethane casting?
The main advantages of this process are lower tooling costs and a quicker turn-around than traditional mould making (e.g. moldings within days of receipt of masters) The products have an exceptional detail and accuracy.
Minimal shrinkage permits use of duplicates or sub-masters for multiple impressions, useful if originals are delicate. Flexible moulds and inserts allow significant undercuts, simplifying mould-making and containing costs.
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Polyurethane casting can be a practical option when you need multiple prototype parts without jumping straight into expensive tooling. It can provide useful flexibility for testing form, fit, and function. At HLH Prototypes, we see casting as a valuable option when a project requires several detailed parts with consistent results.
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