What is pyrex Glass ?How it is made ?

Question

I like to know special features about pyrex glass, How it is made ? What is the allowable maximum temperature it can withstand? What is the melting point ?How it is differ from ordinary Glass?.What are the special application,where where it is used?(Industrial & Domestic & optical).Is the fibre Glass also the same family or other ? I need little brief Answer.

Answer 1

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Pyrex is a brand name of borosilicate glass introduced by Corning Glass Works in 1924. Though borosilicates had been produced before, the name Pyrex is widely used as a synonym for the material. Corning spun off its kitchenware division in 1998, and the Pyrex brand is now owned by World Kitchen, Inc.

Pyrex is created by adding boron to the traditional glassmaker's "frit" of silicate sand, soda, and ground lime. Since Pyrex melts at a higher temperature than ordinary silicate glass, some new techniques were required to bring Pyrex into industrial production. Borrowing from the welding trade, new burners combining oxygen with natural gas were required.

Borosilicate glass has a thermal expansion coefficient about one-third that of ordinary glass. This reduces material stresses caused by temperature gradients, thus making it more resistant to breaking.
Pyrex begins to soften around 821 °C (1510 °F); at this temperature, the viscosity of type 7740 Pyrex is 107.6 poise.
Pyrex is less dense than ordinary glass.
When broken, Pyrex tends to crack into large pieces rather than shattering (it will snap rather than splinter).

Answer 2

Pyrex glass is a borosilicate glass first produced by The Corning Glass Works company. It is made by heating raw materials like silica sand and boric oxide to extremely high temperatures for extended periods of time. The molten material is then processed into different types of glassware. First formulated during the early twentieth century, Pyrex has become an important material for a variety of applications that require heat and chemical resistance.

Answer 3

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Pyrex is a trade name of Corning, maker of Corelle tableware. It is a high thermal borosilicate glass. By percent composition, Pyrex is made of ~80.6% SiO2, and ~12.6% B2O3. It was developed primarily for its ability to withstand high temperature shifts and have durable mechanical properties, things that would shatter common glass easily. It is basically the same as Schott glass.

Answer 4

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What is pyrex Glass ?How it is made ?
I like to know special features about pyrex glass, How it is made ? What is the allowable maximum temperature it can withstand? What is the melting point ?How it is differ from ordinary Glass?.What are the special application,where where it is used?(Industrial & Domestic & optical).Is the fibre...

Answer 5

What Is Pyrex

Answer 6

Borosilicate glass is a particular type of glass, better known under the brand names Pyrex,Kimax, and Endural. It was first developed by German glassmaker Otto Schott in the late 19th century and sold under the brand name "Duran" in 1893. After Corning Glass Works developed Pyrex in 1924, it became a synonym for borosilicate glass in the English-speaking world.Holophane manufactures original equipment lenses for street lights under the Endural brand name.

In addition to the quartz, sodium carbonate, and calcium carbonate traditionally used in glassmaking, boron is used in the manufacture of borosilicate glass. Typically, the resulting glass composition is about 70% silica, 10% boric oxide, 8% sodium oxide, 8% potassium oxide, and 1% calcium oxide. Though somewhat more difficult to make than traditional glass (Corning conducted a major revamp of their operations to make it), it is economical to produce because its superior durability, chemical and heat resistance finds excellent use in chemical laboratory equipment, cookware,lighting, and in certain cases, windows.

Borosilicate glass has a very low thermal expansion coefficient, making it a popular material for objects like telescope mirrors, where it is essential to have very little deviation in shape. It is also used in the processing of high-level nuclear waste, where the waste is immobilised in the glass through a process known as vitrification (contrast with Synroc).

Optically, borosilicate glasses are crown glasses with low dispersion (Abbe numbers around 65) and relatively low refractive indices (1.51 - 1.54 across the visible range).

Unexpectedly, use for Pyrex grew outside of scientific and industrial circles. New lampworking techniques led to artistic uses. Often the art can be refined and then rapidly-produced turning it into novelties that quickly degenerated into kitsch. There is a large market for cheaply reproduced trinkets, smoking pipes, bongs and other novelties. Borosilicate glass is sometimes used for high-quality beverage glassware; Bodum, Inc. markets a line of French coffee presses and double-walled beverage glasses made of borosilicate, lending them increased durability and microwave/dishwasher compatability.

Answer 7

Pyrex is fused silica, or quartz. It is more resistant to thermal stresses than conventional glass, which is a mixture of silica and soda.(and sometimes other metal oxides also). It is used in kitchen and laboratory glassware.

Answer 8

http://en.wikipedia.org/wiki/Pyrex