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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” 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.ZGI Heat treated is a process creating a state of high compression in the outer face of the glass, although in appearance the glass looks to be virtually unchanged, also by different production techniques ZGI Heat Treated Glass will provide you with three type of glass as follows:

• Tempered " Toughened" "Temp-Lite TM"
• Heat Strengthened Glass
• Heat Soak Testing

Tempered “Toughened” - “Temp-Lite™”
ZGI tempered glass, known as “TEMP-LITE”, is manufactured on the world’s most sophisticated horizontal production line. It is approximately five times stronger than ordinary annealed glass of the same thickness and meets architectural safety standards on impact resistance worldwide.

Manufacturing using this horizontal process means that “TEMP-LITE” is free from the unsightly tong marks normally associated with vertically tempered glass.In the production of flat glass of 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 of 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”.

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