Monday, 10 February 2014


Glass Fibre:

           Glass fibre is one of the man-made fibre and can be manufactured either in filament form or in staple form.

Raw Material:

          The principle ingredient of glass fibre is silicon dioxide. However, depending upon the end use, other material like lime, magnesia, alumina, soda, potash or boric oxide is used.

Based on this, there are three types of glass fibres. Those are
  1. Alkali type glass or Glass ‘A’ (A-Alkali)
  2. Electrical type glass or Glass ‘E’ (E- Electrical)
  3. Chemical type glass or Glass ‘C’ (C-Chemical)

The approximate compositions of different type of glass fibres are shown in table.

The principle ingredient i.e. silicon dioxide is generally obtained from sands or sand stones. The second important ingredient is lime, which is used for a stabilizing influence. Magnesium oxide has similar effect. Alumina is usually added to improve the strength; durability and resistance to weathering the other ingredients are generally added to improve acid durability. Additions of titanium oxide reduce the viscosity of the melt. Borium oxide improves weathering charecteristics and also it increases the melting rate.

Fibre formation:

  1. Preparation of the marbles.
  2. Melting and extrusion of the glass.
  3. Fila or staple fibre formation.

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