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General Information

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 "Lahr"; hence, the glass is termed "annealed" or "ordinary" 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 highly desirable conditions of induced stress (described below), which result in additional strength, resistance to thermal stress, and impact resistance.