Introduction to Plastics
A plastic in a very broad sense is defined like any non-metallic material which can be moulded to shape. The very most common definition for plastics is that they are natural or synthetic resins, or their compounds that can be moulded, extruded, cast or employed as films or coatings.
Several of the plastics are of organic nature that composed of hydrogen, oxygen, carbon and nitrogen. The synthetic plastic development dates from the year 1909 while Dr Bakeland announced the production of phenol-formaldehyde. Because then various new plastics have been developed.
The plastics possess unlimited range of properties. Properties general to several of the plastics are expressed below:
1. Light weight.
2. Low thermal conductivity
3. A wide range of colours
4. Resistance to deterioration by moisture
5. Low electrical conductivity
Plastics generally are categorized as
(1) Thermoplastic
(2) Thermosetting
Thermoplastic materials are those that soften on the application of heat, without or with pressure but they need cooling to set them to shape.
Thermosetting materials are those plastics that need heat and pressure to mould them into shape.
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