Vacuum Injection is a most common uses rapid prototyping technology, when you need a short run of your 3d cad model. The parts are  made out of a Polyurethanes with properties close to real injected plastics such as ABS,PA, POM ,PA or TPE’s  or TPR rubbers. Usually series of 10-100 pieces will be run using this casting technology. Each Silicone mold can make maximum 20 to 25 pieces.


The main advantages of this process are a much lower tooling costs and a quicker turn-around than traditional steel mould making. The lead-time to create casted models is around 7-10 days. The products have an exceptional detail and accuracy which comes close to the final injected plastic parts. Flexible silicone moulds allow significant undercuts, simplifying mould-making and containing costs.


The first step of vacuum injection process involves encapsulating/enclosing a master model in a liquid Silicone rubber. This model is usually made by 3d printing, SLA stereo lithography or CNC machining. Then 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.