Epoxy resin is a thermoset plastic containing epoxy groups. Epoxy resin hardens when it is mixed with solidifier and plasticizer. Plasticizers make a polymer more flexible.
Epoxy resins have outstandingadhesion, toughness, and resistance to attack from chemicals. They form strongbonds and have excellent electricalinsulationproperties. Large, complex,void-free castings can be made from them. They are also used as adhesives, and in composites for boat building and sports equipment.
2. PVC (polyvinyl chloride)
PVC (polyvinyl chloride) is a thermoplastic polymer made from vinyl chloride is a colourlesssolid with outstanding resistance to water, alcohols, and concentratedacids andalkalis. It is obtainable as granules, solutions, lattices, andpastes. When compounded with plasticizers, ityields a flexible material moredurable thanrubber. It is widely used for cable and wireinsulation, in chemical plants, and in the manufacture of protectivegarments. Blow moulding of unplasticized PVC produces clear, tough bottles which do not affect the flavour of their contents. PVC is also used for production of tubes or pipes.