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Classification of Glass based on Composition & Applications

By: Haseeb Jamal / On: Jan 22, 2017 / Glass, Types of, Shallow
Building Glass - Glass Types

Classification of Glass

Glass is usually classified into three main classes:

Soda lime glass

  • It is obtained from the fusion of a mixture of silica, lime, soda and alumina.
  • Powdered glass too may be added
  • This glass is also termed as Soda-ash glass, Soda glass or Soft glass
  • It is used for glazing doors, windows and making ordinary glass wares

Lead glass:

  • It is obtained from the fusion of a mixture of silica, lead and potash
  • Powdered glass too may be added
  • This glass is also termed as Flint glass
  • Lead glass has highly shining appearance
  • It is not affected by temperature
  • Cut glass work, electric bulbs and optical glass are made from it

Boro-silicate glass:

  • It is obtained from the fusion of a mixture of silica, borax, lime, and feldspar.
  • Powdered glass too may be added
  • This glass withstands high temperature
  • Laboratory equipment and kitchen utensils are made out of it

Commercial Forms of Glass

Glass is marketed in various commercial forms to suit varying field requirements.

Sheet Glass:

  • Most extensively used in engineering works
  • Size ► Thickness of 2, 2.5, 3, 4, 5 5.5 and 6.5 mm ► sheets up to 175 cm x 110 cm sizes are also available

Ordinary glazing quality: Used for general glazing

Selected glazing quality: Used for better quality works

Special selected quality: Used for superior quality works such as show cases etc

Plate glass:

  • It is made in thickness varying from 3mm to 32 mm and sizes up to 275cm x 90cmm.
  • It is stronger and more transparent than the sheet glass

Tempered plate glass:

  • Glass plate is heated and then suddenly cooled to tamper it
  • Tempered glass is much stronger than ordinary sheet glass.
  • Used for glazing entrance doors, table tops, shelves, counters etc

Laminated glass:

  • Two or more glass plates with intervening layers of transparent plastics are bound under effect of heat and pressure.
  • This type of glass is not broken into pieces when it breaks
  • Ensures safety at places where glass is liable to shatter
  • Glazing windows and doors

Wired glass:

  • It is a rough cast translucent (semi transparent) glass with special steel wire mesh of 0.46 to 0.56 mm dia.
  • Wire mesh completely embedded between the layers of glass during manufacture process
  • Fire resistant and safe during breakage

Insulating glass:

  • Two layers of glass separated by 6mm to 12mm of air space are sealed to provide heat insulation

Colored glass:

  • By adding oxides of metals to metal glass the finish product get colored
  • Used for decoration works in building construction

Flint glass:

  • It is lead glass which shines
  • Used for glass work as optical glass, for making electric bulbs.

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