GLASSHIELD

Glasshield is a heat-treated glass, the surface strength of which is reinforced through carefully controlled heating and cooling conditions . In the production of flat glass the molten silica-based mix is cooled slowly under carefully controlled conditions. This annealing procedure removes undesirable stresses from the glass. Cooling occurs in an annealing 'lehr'. Hence the glass is termed ‘annealed glass.’ Annealed glass which has been heated to a temperature near its softening point and forced to cool rapidly under carefully controlled conditions is described as 'heat-treated glass' The heat-treating process produces conditions of induced stress that result in additional strength, resistance to thermal stress, and impact resistance.