different kinds of glass
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5 times harder than ordinary annealed glass. Once break occurs, the glass disintegrates into small cubical fragments which are relatively harmless to human body. It withstands abrupt change of temperature, for example, a piece of 5mm tolerate the temperature variations within the rang of 2000C.
Insulating glass is made by fusing together 2 panes of glass spaced by dry air, argon or other inert gases.
1: Its excellent efficiency in solar heat insulation, greatly lessens cooling loads
2: The dry air inside the enclosure renders the surface free from misting
3: More excellent efficiency will be if fill in argon or other inert gases