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Insulated Glass

Are your windows cracked, foggy or filled with condensation?

Insulating glass (IG), more commonly known as double glazing (or double-pane, and increasingly triple and quadruple glazing/pane), consists of two or more glass window panes separated by a vacuum or gas-filled space to reduce heat transfer across a part of the building envelope.

Advantages of Insulated Glass

  • The main advantage of insulated glass is that it helps in insulation by reducing the heat gain and heat loss. Adding multiple layers of glass with gas infill further protects the windows and building from heat loss.
  • Another advantage of insulated glass is that it increases the energy efficiency in buildings. The reduced heat transfer lowers the electrical power consumption required for heating or cooling of the space. This drastically cuts down the electrical bills, especially in areas subjected to extreme heat or cold. The use of low-e glass and reflective coatings can further improve the efficiency of the windows by further limiting the heat transfer.
Insulated Glass
Triple Pane WindowTriple Pane WindowDouble Pane Window

Heat Strengthen Glass

Heat strengthened glass is similar to tempered glass except that the cooling is done at a much slower pace. Annealed glass is heated to approximately 650-700 º C, but the cooling process is slower than that for tempered glass. Heat strengthened glass is about twice as strong as annealed glass of the same size and thickness.

Heat strengthened glass is semi tempered glass that retains the normal properties of ordinary float glass. Heat Strengthened glass has been strengthened thermally by inducing a surface compression of 6000 to 9000 psi as compared to a range of 11000 to 20000 psi in the case of fully tempered glass.

Heat strengthening adds strength to the glass while limiting the change in its breakage characteristics. The cooling process places the glass surfaces in a state of high compression and the central core in a state of compensating tension.

Advantages of Heat Strengthen Glass

  • Has a break pattern of large pieces, very similar to that of annealed glass. The shape and size is dependent upon the applied load, the origin of the break, the temperature of the glass, etc.
  • Is rarely prone to spontaneous breakage due to machining or other edge treatments.
Heat Strengthen Glass

Tempered Glass

What is Tempered Glass?

Tempering is a process in which pre processed glass is uniformly heated in a Roller Hearth Oscillating Tempering Furnace. The uniform heating is obtained by conduction, convection and radiation.

Typically, the glass is heated to about 620˚C, with a specified duration of time ( usually at about 40secs/mm thick of the glass), then rapidly cooled or quenched by simultaneously blowing an evenly distributed cool air using high-pressure air nozzles on both surfaces.

When the hot glass is cooled rapidly, the surface of the glass cools faster and hence builds compressive stresses and while the center of the glass is still under expansion and hence builds tensile stress.

Tempered Glass