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Materials are Used to Make Silicone Vacuum Casting by Binashree

The process of silicone vacuum casting starts with preparation of a model based on a drawing with the use of stereolithography or CNC machining. Once this model is ready then several coats of silicone RTV resin of the right grade are applied to create the mould. It is then cut into two, the model extracted and the silicone shell used for silicone vacuum casting processes. Vacuum casting ensures that there are no air bubbles that can show up as pinholes and defects.<br><br>Read more : http://binashree.in/

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Materials are Used to Make Silicone Vacuum Casting by Binashree

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  1. Materials are Used to Make Silicone Vacuum Casting by Binashree

  2. The process of silicone vacuum casting starts with preparation of a model based on a drawing with the use of stereolithography or CNC machining. Once this model is ready then several coats of silicone RTV resin of the right grade are applied to create the mould. It is then cut into two, the model extracted and the silicone shell used for silicone vacuum casting processes. Vacuum casting ensures that there are no air bubbles that can show up as pinholes and defects.

  3. Polyurethane is one of the best choices for engineering grade components that can be made with silicone vacuum process. Polyurethane is available in various grades and types with specific properties. Most polyurethanes are cured at high temperature. Then there are variants of polyurethane. Polyurethane resin mixes used in this process commonly have properties similar to ABS. These have various properties such as exceptional mechanical strength, heat deflection and flexural resistance as well as impact resistance.

  4. Rubber elastomers can also be used with silicone moulds in the vacuum casting process. Most such compounds include silicone itself with various properties, urethane rubber and other elastomers to create seals and gaskets at a low cost. Polycarbonates may also be used with silicone moulds for vacuum casting where high shock resistance and strength are desirable or where high transparency is required.

  5. There are dozens of PU modified ABS/PC/PP/PMMA resins available to suit various parameters of the finished components as well as cost. Binashree technical experts are quite familiar with these resins. Choice of resin from which part is going to be moulded plays a role in influencing mould design and choice of the silicone compound from which the mould is to be made as regards hardness, flexibility and durability. All these factors are taken into consideration when a client expresses a desire to get a part developed through vacuum casting.

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