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Plastic
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  • 1. What is PLASTIC? “The plastic is anorganic substance and it consists of natural or synthetic binders or resins with or without moulding compounds.”
  • 2. “Plastics are compounds ofcarbon with other elements such as hydrogen , nitrogen , oxygen.” “Plastics are polymers.”
  • 3.  Theyprove to be economical as compare to other conventional materials. They should not be bent too much to avoid any stresses in them. They are available in various colours, but it is advisable to avoid red and black colours on external expose surfaces. They should provide wood heat resistance .
  • 4. They should not be affected by chemicals , salts, acids easily.Their shape and size should not be distorted easily. Their colours should not be fedded easily. They should durable with good resistance to cracks and breaks. They should possess good strength.
  • 5. 1. THERMO PLASTIC2. THERMOSETTING PLASTIC
  • 6. “THERMOPLASTIC IS A POLYMERTHAT TURNS INTO A LIQUIDWHEN HEATED AND FREEZESINTO A VERY GLASSY STATEWHEN COOLED SUFFICIENTLY.”
  • 7.  They have linear or chain structure. They are produced by addition polymerisation.Ex: Acrylic, PVC, polystyrene, polyethelene, nylons,etc.
  • 8.  This plastic has cross linked or network structure. It is produced by condensation polymerisation. This plastics need a large prssure and momentary heat while moulding which becomes hard on cooling. remoulding is impossible .
  • 9.  Compare to thermoplastics , this have high strength. Telephone receivers, radio & T.V cabinets, camera body’s , switches, circuit breakers etc are made from thermosetting plastic.Ex : Bakelite, epoxy, polyesters, melamines, etc.
  • 10. It is light in weight.Specific gravity of plastic is 1.40.It is easy to cast , mould , blow, saw, drill. It has good machinability.It is easy to fix them in any position.They have high tensile and compressive strength.They have low thermal conductivity.They have low electrical conductivity.They can absorb shocks.They are free form corrosion .They are no attacked by vermin, insects, etc.They can be manufactured in wide range of colours.It is possible to manufactured plastic colourless and transparent as well as non transparent.
  • 11. They are use to make:- Furniture like sofa , table , chair,etc. Optical lenses, spectacles, frames. Handles of tools cases of machines , covers. Electrical and heat insulators , electrical appliances and accessories. Cooking wears, table wears. Water proof doors, bags. Sanitary fittings like taps , pipes, valves etc.
  • 12. THE END