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3.2 Polymers GapFill
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Polymers are long chains of molecules made from petrochemicals, coal or . Recent developments have seen new polymers manufactured from , which are biodegradable.
Polymers have different working properties and are therefore suited to a range of applications. A tough, durable and flexible polymer, , is commonly used for rainwater pipes and guttering, whereas a polymer such as has excellent heat resistance properties, making it ideal for use in products such as toasters and sandwich makers. However, electrical cables made from copper must be insulated with to prevent the risk of electrocution and fire.
Polymers have excellent resistance to making them an ideal choice of material to help protect against electrocution. Some properties however can cause problems because some thermosetting polymers are very which means if they get broken they can leave sharp edges, like electrical plug sockets for example.
Polymers can be coloured using during the manufacturing stages. Sheet material such as HIPS is pre-coloured for use when , whereas coloured granules are introduced into the hopper when to create coloured polymers.
Polymers are often described as being self-finishing, which is due to the processes involved and the use of moulds. It is possible to apply some surface finishes such as to products such as cycle helmets, for example.