Glass

History of different types of glass and how they are made

After 1500 BC, craftsmen in Egypt began developing methods of producing glass pots by dipping a core of compacted sand into molten glass and turning the mould. The still soft glass-covered mould was then rolled on a slab of stone to smooth or decorate it. Over the next 500 years, glass production was centered in Alessandria, and spread from there to Italy. Instructions on how to make glass have been found on tablets from the library of the Assyrian king Ashurbanipal dating back to around 650 BC.

Glassblowing emerged between 27 BC and 14 AD in the Sidon-Babylon area developed by Syrian craftsmen (Glass Online, 2001). The Romans spread glass making th

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ht bulbs, cookware, mirrors and windowpanes contain ceramics and cannot be recycled because they would introduce impurities into the new glass (Green Networld, 2001); Newton's Apple, 2001). Lead-based glass such as crystal and television tubes are also non-recyclable (MSUCares, 2001). Contaminants can seriously damage the furnace used for melting the glass, or result in poor quality products (Green Networld, 2001; MSUCares, 2001). Glass furnaces operate at a temperature of 2800oF. Lead and aluminum melt at this temperature, iron and lead settle on the bottom of the tank and corrode its brick lining. Aluminum melts into small balls called "stones" or bubbles called "seeds" which can be deposited in the walls of the glass containers being made, where they cause aesthetic problems and weaken the walls of the bottles. Steel lids do not melt at this temperature and may block feed lines from the furnace and cause production to shut down. Iron contaminants in the steel lids can cause brown streaks in the glass, which are especially noticeable in clear glass. Ceramics and stone do not melt at glass furnace temperatures, and can block feed lines or cause imperfections in the finished product. Glass, unlike many other materi
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Approximate Word count = 2589
Approximate Pages = 10 (250 words per page)

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