Glass: Types and Uses of glass

The glass has been used an an engineering material since ancient time. It is a amorphous solid. Because of the rapid progress made in the glass industry in recent times, the glass has come out as the most versatile engineering material of the modern times.The first glass objects made by man were of natural glass such as obsidian and rock crystal. The glass of any type and quantity can be produced to fulfillment the requirement of different industries. Glass are used in different place such as:-

Glass window

  • A modern boeing 707 jet plane contains more than 5000 components of glass.
  • The fibre glass reinforced with plastics can be used in the construction of furniture, lampshades, bathroom fittings, navy boats, aeroplanes, cars, trucks, etc.
  • The glass linings are applied on equipment's likely to be affected by the chemical corrosion such as valves, pumps, pipes,etc.
  • The glass is the only material strong enough to go upto bottom of ocean and to maintain its buoyancy. It is therefore used in the construction of noses of deep-diving vehicle.
  • In the construction of modern homes, the walls and ceiling of hollow glass blocks can be made.Such construction cuts of the glare.But it admits sunlight and controls sound and heat in a better way.
  • In the field of fire-arms,the glass is used to forma rifle barrel which is lighter and stronger than the conventional type.
  • It will be interesting to note that now-a-day,it is possible to prepare the colour-changing glass.A window with such glass will be transparent during daytime and it will be a source of light at night.
  • The body of a guided missile contains thousand of glass items.
  • The development and advancement of sciences of astronomy and bacteriology are mainly due to the use of optical glass.

  • Classification Of Glass:-
          The glass is a mixture of a number of a number of metallic silicates,one of which is usually                  that of an alkali metal.It is amorphous,transparent.It may also be considered as a solidified                  super-cooled solution of various metallic silicates having infinite viscosity.
Different colour glasses

  • Soda-lime glass or commercial glass
  • Potash-lime glass
  • Potash-lead glass
  • Common glass
  • Borosilicate glass

  • Properties Of Glass:-
The properties of glass are mainly governed by factors such as composition of the constituents,state of surface,thermal treatment conditions,dimensions of specimen,etc.
  • It absorb,refracts or transmits light.
  • It can a take up a high polish and may be used as substitute foe very costly gems.
  • It has no definite crystalline structure.
  • It has no sharp melting point.
  • It is affected by alkalies.
  • It is an excellent electrical insulator at elevated temperatures due to the fact that glass can be considered as an ionic liquid. The ions are not easily moved at room temperature because of the high viscosity. But when the temperature rises, the ions are permitted to flow and thus they will sustain an electric current.
  • It is available in different colours or shape, It behaves more as a solid than most solids in the sense that it is elastic. But when the elastic limit is exceeded, it fractures instead of deforming.
  • It is not usually affected by air or water, and not easily attacked by ordinary chemical reagents.  
  • It is possible to intentionally alter some of its properties such as fusibility, hardness, refractive power, etc. to suit different purposes. it is transparent and translucent. The transparency is the most used characteristic of glass and it is due to the absence of free electrons. For the same reason, it also work as a good insulator.

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