Introduction to glass

Introduction to glass

Introduction to glass

Glass is the name given to all amorphous bodies that are obtained by lowering the temperature of a melt independently of its chemical composition and the temperature range of solidification, which as a result of the gradual increase of viscosity adopts the mechanical properties of a solid body.

Glass is melted at a temperature between 1000 and 2000° C.

The microscopic structure of glass is comparable to that of a liquid in which the individual constituents form an irregular network without a long range order. Glass is also the name given to a cooled melt.

Raw Materials:


The substances are introduced in the form of quartz sand, soda and lime. 5% oxides such as magnesium and aluminium oxide are added to this mixture. These additives improve the physical and chemical properties of the glass. 


Main glass groups

  • Soda lime glass
  • Lead glass
  • Boro silicate glass

Main glass products:

  • Flat glass (for architectural or automotive applications)
  • Glass containers/glass tubes
  • Special glasses
  • Glass fibre


Float Glass process

The float process refers to the manufacturing process for flat glass. This process came into general use in the 1960s. Saint-Gobain installed its first factory equipped with float technology in Pisa, in 1965. The theory: as the molten glass ribbon comes out of the oven, it is floated on a bath of liquid tin. Result: the glass does not need polishing or smooth grinding. It is cut directly on the production line.

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