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Vacuum casting is the technology that allows us to reproduce pieces in polyurethane resin using a silicone mould. For the manufacture of this mould we use, generally, a first model of stereolithography (SLA). However, this technique allows us to use as a master almost any type of piece made with other technologies, such as laser sintering (SLS), molten deposition modelling (FDM) or machining (CNC). We can produce short series of pieces with polyurethane resins whose characteristics (flexibility, transparency, resistance to high temperature, fiber loading, fire retardant -V0-) are similar to those of the final product: ABS, Polypropylene, Polycarbonate, etc. There are also polyurethanes with FDA approval suitable for food use.
