flint glass of high luster. It is hand- or machine-made in decorative shapes and may be cut, etched, or engraved.

an optical glass with a low index of refraction. It is typically used for the converging element in a lens system.

flint glass that is used decoratively, chiefly for art objects or tableware. It is colorless and highly transparent.

art glass with a design made by cutting or grinding the surface.

glass made in the form of fibers used chiefly in making textiles, insulation, and reinforced plastics. Glass fibers used in fiber optics are usually called optical fibers.

glass having a wavy or patterned surface.

a general term for sheet glass, plate glass, float glass, and various forms of rolled glass. It is typically used in windows, doors and partitions.

an optical glass containing a high proportion of lead oxide. It has a relatively high index of refraction and is usually used as the diverging element in a lens system.

a type of flat glass that has an especially smooth surface and is distortion-free.

solid or hollow blocks of glass used in construction to provide thermal and acoustic insulation.

See, in this list, FIBERGLASS; OPTICAL FIBER.

a solid material, partly crystalline and partly glass, formed by the controlled crystallization of a glass.

glass containing chemical ingredients that absorb infrared waves, thus reducing heat flow between the interior and exterior of a building.

glass able to withstand rapid temperature changes without cracking. An important use for heat-resisting glass is in making cooking utensils; one type, known by the trade name Pyrex, contains boron oxide in place of soda ash.

bottles, jars, vials, and other containers for holding a liquid or gas.

a glass product containing a layer of air sealed between two panes of glass. The use of such glass, sometimes called double glazing, provides thermal insulation. Thermopane is a well-known trade name for this type of glass.

a glass product consisting of two panes of glass separated by and bonded to a layer of clear plastic. When laminated glass is fractured, the plastic helps hold pieces of broken glass in place, reducing the danger of injury.

glass containing a substantial proportion of lead oxide. It has a high refractive index and is readily decorated by grinding. It is used for such articles as vases, ashtrays, and drinking glasses.

See SODA-LIME GLASS, in this list.

glass fiber through which light can be transmitted and from which the escape of light is prevented or minimized.

glass of high quality made to have specific optical properties. Flint glass and crown glass are two important types of optical glass.

glass containing silver halide compounds that darken when exposed to ultraviolet or visible light and regain their clarity when the exposure ends. It is used mainly in eyeglasses.

a type of thick rolled glass usually ground and polished on both sides and used in mirrors, display cases, and windows.

glass formed by pressure between a mold and a plunger.

flat glass made in a way that makes it relatively resistant to breakage and hinders the formation of sharp, dangerous fragments if the glass is broken. Safety glass includes laminated glass, tempered glass, and wire glass.

also called Window Glass, flat glass made in thin panes, usually 1/4 inch (0.6 cm) thick or less.

glass composed of silica, soda ash, and lime; the oldest and most widely used kind of glass.

colored glass used in art objects.

a pane of specially treated plate, sheet, or float glass. When broken at any point, the entire pane immediately breaks into small, granular pieces without jagged edges. It is used in doors and in automobile windows.

See INSULATING GLASS, in this list.

glass made of silica and soda ash. It is soluble in water.

See SHEET GLASS, in this list.

a pane of glass with a layer of meshed wire completely embedded in it.