HOW IS GLASS MADE? - Leading Construction and Building Group

Dial A Contractor
Dial A Contractor
Go to content
                                                                                                                            














                                                                                                                            
HOW IS GLASS MADE?

Glass is made by mixing raw materials such as sand, limestone, soda, dolomite, felspar and saltcake then heating them together at a temperature of over 1500oC. When the materials are melted, they form a viscous liquid called the quiescent melt. As this melt cools, the viscosity increases until the glass becomes hard. If the liquid cools too quickly, the glass does not have time to release stresses. This process is done by heat treatment and is called annealing.

Silica sand is the main raw material in glass, but very high temperatures are needed to melt it. By adding soda ash, a fluxing agent, the glass can be melted at a lower temperature, but the result is water glass which is soluble in water. Limestone, a stabiliser, is thus added to the silica and soda ash. Cullet (scrap glass) is also added to assist the melting process.


  

CONTACT DETAILS
ADDRESS: PO BOX 16123, PANORAMA, 7506    
CAPE: 021 300 1098   BLOEMFONTEIN: 051 004 0119   DURBAN: 031 100 1164   JOHANNESBURG: 011 568 0712   PORT ELIZABETH: 041 004 0007   PRETORIA: 012 004 0239    POLOKWANE: 015 004 0199
FACSIMILE: 086 650 5033    EMERGENCY CONTACT: 082 509 3022  

Back to content