Answered By: Library Intern Last Updated: Jul 19, 2016 Views: 53
The common glasses we see in items such as bottles and window panes are made mainly from three crystalline materials: crushed white sand; crushed limestone; and sodium carbonate. Small amounts of other additives are used to improve the glass quality, but these three are the principle elements.
In a factory where items such as bottles are made, these three ingredients are blended and heated for extended periods of time in order to form the transparent material we call glass. The temperature involved is in the neighborhood of 2500° F. and the residence time of glass in a furnace may be as much as 24 hours. These conditions are necessary because glass is a viscous material even at high temperatures. Thus it takes a long time to rid the glass of small bubbles.
You may wish to review http://www.cmog.org/article/what-is-glass for more information.