thermosetting plastic cannot be remoulded. The polymers have strong cress-linkin bonds locking them into a giant molecular structure. Individual strands cannot be shifted without breaking part of the structure. this makes thermosetting plastics hard (scratch resistant) brittle (will shatter if dropped) and rigid ( not able to be bent). When heated, individual strands cannot move-- thermosetting plastics will char (burn at the edges ) but will not soften. They thus need to be manufactured and moulded at the same time. Bakelite is an example of a thermosetting plastics. Working with plasticthermoplastics can be moulded into new shapes in a number of different ways.extrusion mouldingpipes, hoses, plastic straws, curtain tracks, rods and fibers are all made by extrusion moulding
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