Plate glass, flat glass or sheet glass is a type of

glass Glass is a non-Crystallinity, crystalline, often transparency and translucency, transparent, amorphous solid that has widespread practical, technological, and decorative use in, for example, window panes, tableware, and optics. Glass is most ...

, initially produced in plane form, commonly used for

window A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air. Modern windows are usually glazed or covered in some other transparent or translucent mate ...

s, glass doors, transparent walls, and

windscreen The windshield (North American English) or windscreen (Commonwealth English) of an aircraft, car, bus, motorbike, truck, train, boat or streetcar is the front window, which provides visibility while protecting occupants from the elements. ...

s. For modern architectural and automotive applications, the flat glass is sometimes bent after production of the plane sheet. Flat glass stands in contrast to '' container glass'' (used for bottles, jars, cups) and ''

glass fibre Glass fiber ( or glass fibre) is a material consisting of numerous extremely fine fibers of glass. Glassmakers throughout history have experimented with glass fibers, but mass manufacture of glass fiber was only made possible with the inventio ...

'' (used for thermal insulation, in

fibreglass Fiberglass (American English) or fibreglass (Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass clot ...

composites, and for optical communication). Flat glass has a higher

magnesium oxide Magnesium oxide ( Mg O), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It has an empirical formula of MgO and consists of a lattice of Mg2+ ions and O2− ...

and

sodium oxide Sodium oxide is a chemical compound with the formula Na2 O. It is used in ceramics and glasses. It is a white solid but the compound is rarely encountered. Instead "sodium oxide" is used to describe components of various materials such as glass ...

content than container glass, and a lower silica,

calcium oxide Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. The broadly used term "'' lime''" connotes calcium-containing inorganic ...

, and aluminium oxide content."High temperature glass melt property database for process modeling"; Eds.: Thomas P. Seward III and Terese Vascott; The American Ceramic Society, Westerville, Ohio, 2005, From the lower soluble oxide content comes the better chemical durability of container glass against water, which is required especially for storage of beverages and food. Most flat glass is

soda–lime glass Soda–lime glass, also called soda–lime–silica glass, is the most prevalent type of glass, used for windowpanes and glass containers (bottles and jars) for beverages, food, and some commodity items. Some glass bakeware is made of soda-lime ...

, produced by the

float glass process Float glass is a sheet of glass made by floating molten glass on a bed of molten metal, typically tin, although lead and other various low- melting-point alloys were used in the past. This method gives the sheet uniform thickness and very flat sur ...

(1950s). Other processes for making flat glass include: * Broad sheet method (13th century) * Window crown glass technique (14th century) * Blown plate method (17th century) * Plate polishing (17th century) * Cylinder blown sheet method * Machine drawn cylinder sheet method (early 20th century) * Rolling (

rolled plate glass Rolled plate is a type of industrially produced glass. It was invented and patented by James Hartley circa 1847. Rolled plate is used architecturally Architecture is the art and technique of designing and building, as distinguished from the s ...

, figure rolled glass) (19th century) * Fourcault process (1900s) *

Float glass Float glass is a sheet of glass made by floating molten glass on a bed of molten metal, typically tin, although lead and other various low-melting-point alloys were used in the past. This method gives the sheet uniform thickness and very flat sur ...

(1950s) * Overflow downdraw method (1960s) The term plate glass universities is used in the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the European mainland, continental mainland. It comprises England, Scotlan ...

to describe a group – or generation – of universities (in an acknowledgement of the term

red brick universities A red brick university (or redbrick university) was originally one of the nine civic universities founded in the major industrial cities of England in the 19th century. However, with the 1960s proliferation of plate glass universities and ...

, used for an older generation of establishments).

Quality and damage

Scratches can occur on sheet of glass from accidental causes. In glass trade terminology these include "block reek" produced in polishing, "runner-cut" or “over/under grind” caused by edge grinding, or a "sleek" or hairline scratch, as well as "crush" or "rub" on the surface.Ron Hanifan Concise Dictionary of Engineering: A Guide to the Language 2014 3319078399 "Scratches occur on sheet glass in all degrees from various accidental causes. Block reek is a chain-line scratch produced in polishing. A runner-cut is a curved scratch caused by grinding. An over/under grind is an imperfection on the edge. A sleek is a hairline scratch. A crush or rub is a surface ..."

References

{{Authority control Glass types English inventions

Quality and damage

See also

References