Thermosets are formed by a moulding process where they create lots of links across the different polymer chains. This stop the chains from moving and make them harder and more rigid than thermoplastics. This gives them a good resistance to electricity and heat. Once they have been moulded they cannot be re-shaped or recycled.
Thermosetting polymers include melamine formaldehyde, phenol formaldehyde, urea formaldehyde and epoxy resin. They are used for things like electrical fitting, electrical equipment, electrical insulators and domestic appliances.#
Thermosets are available in powder or granular form, they can be mixed with fillers and colouring agents. A filler is a cheap material that is used to add bulk therefore reducing the amount of polymer needed. This makes it cheaper and can change the properties of the polymer.
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