Ppg Industries Ohio, Inc.

Schott Ag

James M Baldauff

Larry J Shelestak

George B Goodwin

Amarendra Mishra

Dennis G Smith

An aircraft transparency in a glass piece, wherein the glass piece includes a chemically tempered first major surface and a chemically tempered opposite second major surface, a first case depth begins at the first major surface, a second case depth begins at the second major surface, and a tensile stress zone is within the glass piece between the end points of the first and the second case depths. The glass between the end points of the first and second case depth has a glass composition including: the glass has at least one of the following properties (a) a log 10 viscosity temperature of at least 1413&#xb0; F. and (b) a liquidus temperature of at least 2436&#xb0; F.

Aircraft transparency having chemically tempered lithia-alumina-silica containing glass and method of making the chemically tempered glass

A glass composition for chemical tempering includes oxides in wt % ranges of: SiO60 to 75; AlO18 to 28; LiO 3 to 9; NaO 0 to 3; KO 0 to 0.5; CaO 0 to 3; MgO 0 to 3; ZrO0 to 3; where MgO+CaO is 0 to 6 wt %; AlO+ZrOis 18 to 28 wt %, and NaO+KO is 0.05 to 3.00 wt %. The glass has a log 10 viscosity temperature in the temperature range of 1328&#xb0; F. (720&#xb0; C.) to 1499&#xb0; F. (815&#xb0; C.); a liquidus temperature in the temperature range of 2437&#xb0; F. (1336&#xb0; C.) to 2575&#xb0; F. (1413&#xb0; C.), and a log 7.6 softening point temperature in the temperature range of 1544&#xb0; F. (840&#xb0; C.) to 1724&#xb0; F. (940&#xb0; C.). The chemically tempered glass has, among other properties, an abraded modulus of rupture of 72 to 78 KPSI, and a modulus of rupture of 76 to 112 KPSI.

Lithia-alumina-silica containing glass compositions and glasses suitable for chemical tempering and articles made using the chemically tempered glass

A glass composition that includes a base glass composition including: SiOfrom 65 to 75 weight percent, NaO from 10 to 20 weight percent, CaO from 5 to 15 weight percent, MgO from 0 to 5 weight percent, AlOfrom 0 to 5 weight percent, KO from 0 to 5 weight percent and BaO 0 to 1 weight percent, and a colorant and property modifying portion including total iron from 0.25 to 0.9 weight percent, CrOfrom 6 PPM to 400 PPM, ErOfrom 0.3 to 3.0 weight percent, and TiOfrom 0.1 to 0.8 weight percent, wherein the glass composition has a redox ratio ranging from 0.15 to 0.62.

Gray glass composition

The present invention provides a blue glass that can be essentially free of selenium and cobalt but still has a blue color and desired luminous transmittance. Additionally, the amount of iron present is comparable to conventional soda-lime-silica glass. The glass of the present invention can have a soda-lime-silica glass base portion, with major colorants that provide the blue color.

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Pittsburgh, PA, United States of America

James M Baldauff