sand
2007-03-16 04:41:24
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answer #1
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answered by skcs11 7
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The main component of a glass is silica. One can made a glass from a pure silica.But it would be difficult to fuse silica to form a glass. So there are other chemicals that are added to glass components for specific purposes. There are these chemicals that lower the temperature that the mixture could be fused (like soda and lime). Other chemicals would be added so that the glass could attain some properties like they could withstand high temperatures without breaking such as Pyrex, which has boro-silicates or alumino-silicates. There are also some metallic oxides that are added to improve not only thermal properties but also optical properties like refractive index, color, etc.
Most commercial glasses have roughly similar chemical compositions of:
70% - 74% SiO2 (silica)
12% - 16% Na2O (sodium oxide)
5% - 11% CaO (calcium oxide)
1% - 3% MgO (magnesium oxide)
1% - 3% Al2O3 (aluminium oxide)
To sum it all up, there are different types of glasses and so, there are also different components of glasses but the main component of glasses is Silica.
For some types of glasses, go to:
http://www.britglass.org.uk/AboutGlass/TypesofGlass.html
2007-03-16 04:22:53
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answer #2
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answered by TheGreatThinker 2
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Glass, an amorphous substance made primarily of silica fused at high temperatures with borates or phosphates. Glass is also found in nature, as the volcanic material obsidian and as the enigmatic objects known as tektites (see Tektite). It is neither a solid nor a liquid but exists in a vitreous, or glassy, state in which molecular units have disordered arrangement but sufficient cohesion to produce mechanical rigidity. Glass is cooled to a rigid state without the occurrence of crystallization; heat can reconvert glass to a liquid form. Usually transparent, glass can also be translucent or opaque. Color varies with the ingredients of the batch.
Molten glass is plastic and can be shaped by means of several techniques. When cold, glass can be carved. At low temperatures glass is brittle and breaks with a shell-like fracture on the broken face. Such natural materials as obsidian and tektites (from meteors) have compositions and properties similar to those of synthetic glass.
Glass was first made before 2000 bc and has since served humans in many ways. It has been used to make useful vessels as well as decorative and ornamental objects, including jewelry. Glass also has architectural and industrial applications.
Impurities in the raw materials affect the color of glass. For a clear, colorless substance, glassmakers add manganese to counteract the effects of iron traces that produce greens and browns. Glass can be colored by dissolving in it metallic oxides, sulfides, or selenides. Other colorants may be dispersed as microscopic particles.
2007-03-16 05:39:01
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answer #3
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answered by Panic!!! 2
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Container glass is made of simple, natural ingredients: silica sand, soda ash and limestone. These materials are mined all over North America and there is a plentiful supply available. The following chart illustrates the basic list of ingredients for container glass.
TFTP
2007-03-16 04:16:58
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answer #4
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answered by Anonymous
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Glass is made from melted sand. Sometimes lead is added to make the glass more "brilliant". Sometimes other minerals are added to change the color - iron makes it green, cobalt makes it blue, etc.
See the link for a history and more details.
2007-03-16 04:21:13
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answer #5
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answered by Anonymous
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Silicon. Melted Sand.
2007-03-16 04:16:41
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answer #6
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answered by Dave B. 4
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glass is a man made liquid. it is liquid because the cool so quickly that it never reaches the stucture of a solida state. look at some old window pains, and you'll see that they flow, just at a very slow rate.
glass is made up of the elements silica and oxygen. the formula is SiO2.
2007-03-16 05:38:04
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answer #7
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answered by Falcon Man 3
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Quartz sand
http://en.wikipedia.org/wiki/Glass
2007-03-16 14:59:31
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answer #8
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answered by Alletery 6
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It all used to be natural(lightning and sand), but most of it is synthetic now(made in factories)
2007-03-16 04:16:14
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answer #9
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answered by Jason 1
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Silicon!
2007-03-16 04:22:32
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answer #10
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answered by Billy Butthead 7
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