Glass
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Bookmarked webpages about glass The Corning Museum of Glass Channel from YouTube Raw Materials of Glass Uploaded by corningmuseumofglass on Aug 23, 2007 See and understand the magical process of making glass from simple materials, by using great heat. Until the most recent times, glassmaking was a closely guarded secret passed on within workshops or even families from one generation to the next, often over hundreds of years.
Changing Materials - Glass
Glass
Glass has been used for thousands of years. In the past it was very expensive and only the richest people could afford glass for windows and jewellery. Today glass is much less expensive and is used to make many different things, from windows and light bulbs to milk bottles and glass jars.
Glass bottles (for cucumber slices) on shipping pallets A Soviet mayonnaise jar A modern "French Kilner" jar Glass production involves two main methods – the float glass process, which produces sheet glass, and glassblowing which produces bottles and other containers.
Glass production
Glass
Glass is an amorphous (non- crystalline ) solid material that exhibits a glass transition . Glasses are typically brittle and optically transparent . The most familiar type of glass, used for centuries in windows and drinking vessels , is soda-lime glass , composed of about 75% silica (SiO 2 ) plus sodium oxide (Na 2 O) from soda ash, lime (CaO), and several minor additives. Often, the term glass is used in a restricted sense to refer to this specific use. In science, however, the term glass is usually defined in a much wider sense, including every solid that possesses a non-crystalline (i.e. amorphous ) structure and that exhibits a glass transition when heated towards the liquid state. In this wider sense, glasses can be made of quite different classes of materials: metallic alloys , ionic melts, aqueous solutions , molecular liquids, and polymers .
The History of Glass Making
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Some 2000 years ago, a group of Phoenician merchants used blocks of "natron", an alkali, to support their cooking pots over the fire while preparing dinner. When the fire burned out, they discovered a clear residue. This has been credited with being the first human-made glass. The story has a nice imaginative appeal. However, it would not have been possible for the heat from the fire to fuse natron and sand into a glass-like substance. This would have required a temperature over 1100 degrees centigrade.
The Story of Glass
Raw Materials and Batch House The glass production starts with the arrival of raw materials. These raw materials consist of: 1.) Silica Sand: majority of the raw materials. 2.) Soda Ash: helps melt sand evenly at lower temperature 3.)
