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Common raw materials used for making glass consist of the following:
- Sand: finely divided rock and mineral particles, typically high in silica (silicon dioxide: SiO2).
- Soda ash: sodium carbonate: Na2CO3.
- Dolomite: calcium magnesium carbonate: CaMg(CO3)2.
- Limestone: a sedimentary rock composed largely of the mineral calcite (calcium carbonate: CaCO3).
- Salt cake: sodium sulfate, the sodium salt of sulfuric acid: Na2SO4.
- Other materials may be used as colorants, refining agents or to adjust the physical and chemical properties of the glass.
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.
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i don't like you
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window glass
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Window Glass
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Was Princess Diana's coffin made of glass?
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