Shipa Glass India Pvt Ltd - Glass Products - Toughened Glass

Toughened glass or tempered glass is a type of glass that has increased strength and will usually shatter into small fragments when broken.

Shipa Tempered Glass is being used increasingly in architecture because of its strength and safety properties. It is usually installed in areas where safety glass is required to lessen the pssibility of mechanical or thermal breakage and/ or to assure greater uniform load strength. Glass is tempered by taking annealed glass and heating it to softening point of approximately 660 C. Its structure is then rapidly cooled while the inner core is allowed to cool gradually. This results is layer of high compression on the surface counter balancing by high tension at the center resulting in a glass that is four to five times stronger than annealed glass. Should accidental breakage occur, the resulting fragments are smaller and granular, causing minimum injury.

Toughened glass is strong, has enhanced thermal resistance, and breaks into small cuboid fragments rather than irregular shards of glass.

Toughened glass is used when strength, thermal resistance and safety are important considerations, such as in microwavable see-through cookware. Other forms of tempered glass are Borosilicate glass for baking by Pyrex and Arcuisine, ceramic-glass dinnerware by Corelle and Arcopal and bakeware and stovetop pots by Arcoflam. Within the home, tempered glass can be found in display case windows, shower doors, glass patio doors, glass dinnerware and drinking glasses. In commercial structures, tempered glass is used for unframed assemblies such as frameless doors, structurally loaded applications and any that would be dangerous in the case of a human impact.

Toughened glass is made from annealed glass via a thermal tempering process. The glass is placed onto a roller table, taking it through a furnace that heats it to above its annealing point of 600 °C. The glass is then rapidly cooled with forced draughts of air while the inner portion of the glass remains free to flow for a short time.

• Impact Resistance - A surface compression of over 10,000 PSI(69MPa) imparts about five times the impact and mechanical strength of annealed glass of the same thickness.
• Thermal Cracking Resistance - Tempered Safety Glass will resist temperatures of up to approximately 295 C an temperature difference of up to approximately 250 C. In a range frm -20 C to 300 C.
• Safety - When broken, tempered glass become small granules, which will not exert substantial hurt to human body.
• Optical Clarity - Tempered safety glass may contain some minor visual imperfection introduced through the heating