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Showing posts from February, 2021

Prosthetics - Snap Moulds, part 2! Polyurethane positive/core

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Now that a silicone mould has been made and prepped, the next step is to create the polyurethane positive/core for the snap mould. "Polyurethane is a plastic material, which exists in various forms. It can be tailored to either be rigid or flexible". (polyurethanes, no date). According to Dalchem, polyurethane is made of two components, those being urethane and polymers. These polymers are bonded together by urethane groups which then creates a versatile solution that can take many different forms. (Dalchem, no date).   Polyurethane has many different uses, such as insulation of fridges and freezers, car parts, mattresses, tyres and even shoe soles. (Polyurethanes, no date).  The polyurethane used was Axson F40 polyurethane resin. This resin has a quick setting time, a low shrinkage rate (meaning it won't shrink as it sets) and high abrasion resistance. (Neillsmaterials, no date). A catalyst is required for this, so isocyanate F40 was used, as per manufacturer's instr