Common raw materials used for making glass consist of the following:
Flat glass for windows and similar applications is formed by the float glass process, where a continuous ribbon of glass is created using a molten tin bath on which the molten glass flows unhindered due to the influence of gravity. The top surface of the glass is subjected to nitrogen under pressure to obtain a polished finish.
Windows are usually glazed or covered in some other transparent or translucent material. Window frames and sashes can be made of wood, vinyl, PVC, aluminum, or fiberglass.
For more information on what glass is made of, see What_is_glass_made_of
The above information provided by Red Five Development, the makers of iPod / iPhone apps such as Brainwave Entrainment (audio for improving cognitive functioning) and FlashCards (for quizzing/studying anything you want to learn). See http://www.red5dev.com
EDIT: Lead salts are added to window glass to make it "sparkle", also. It also improves glasses's workability. The lead salts slow any UV rays passing, too. This is why it's hard to get a suntan through a closed window.
If you know who made it the factory should be able to supply. If it is stationary and double paned then most glass companies should be able to supply a new glass. Should be able to install new glass in old window even if the frame in solid around glass. There is always a way to replace any window glass.
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