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** How is glass made? **

by Marshall Brain | October 14, 2010


*You Asked:*

How is glass made? — Ishaq, Jeddah, Saudi Arabia

*Marshall Brain Answers:*

The simplest glass is made by melting sand. For example, if a bolt of
lightning hits a sand dune, its heat forms a Fulgurite in the sand, which
is the simplest glass.

But at a glass factory, they usually add soda lime, cullet and a few other
ingredients to the sand to make it easier to melt the glass and to create a
more consistent product, as seen here:

For more info see: What makes glass transparent?

Tags: glass, heat, lightning, sand

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how is glass made

How to Make Glass: 10 Steps (with Pictures) - wikiHow

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** How to Make Glass **

Edited by Tamanna, Quack123, Maluniu, Dave Crosby and 14 others

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Making glass goes at least as far back as the third millennium B.C., with
glass pieces found in Mesopotamia. Once a rare art, manufacturing glass has
become a commonplace industry, with glass products in both commercial and
home use as containers, insulators, reinforcing fiber, lenses and
decorative art. While the materials used to make them may vary, the general
process for how to make glass is the same and is described below.

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*Edit Steps*

1. 1
*Get a sufficient amount of silica sand*. Also called quartz sand, silica
sand is the primary ingredient in making glass. Glass without iron
impurities is sought for clear glass pieces, as the iron will cause the
glass to appear greenish when present.

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· If it is not possible to find sand sufficiently free of iron impurities,
their tinting effect can be countered by adding small amounts of manganese

· 2
*Add sodium carbonate and calcium oxide to the sand*. Sodium carbonate, or
soda, lowers the temperature necessary to make glass commercially. However,
it permits water to pass through the glass, so calcium oxide, or lime, is
added to negate this property. Oxides of magnesium and/or aluminum may also
be added to make the glass more durable. Generally, these additives take up
no more


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