A method includes supplying a conjoined molten glass stream to an overflow distributor. A cross section of the conjoined molten glass stream includes a first cross sectional portion and a second cross sectional portion. The first cross sectional portion includes a first glass composition. The second cross sectional portion includes a second glass composition different than the first glass composition. The first glass composition is flowed over a first transverse segment of a weir of the overflow distributor. The second glass composition is flowed over a second transverse segment of the weir of the overflow distributor.

Methods of fabricating a glass laminate is provided. According to one embodiment, a glass laminate comprised of a microwave absorbing layer and a microwave transparent layer is formed. The microwave absorbing layer is characterized by a microwave loss tangent .sub.H that is at least a half order of magnitude larger than a loss tangent .sub.L of the microwave transparent layer. An area of the glass laminate is exposed to microwave radiation. The exposed area comprises a cross-laminate hot zone having a cross-laminate hot zone temperature profile. Substantially all microwave absorbing layer portions of the hot zone temperature profile and substantially all microwave transparent layer portions of the hot zone temperature profile reside above the glass transition temperature T.sub.G of the various layers of the glass laminate prior to impingement by the microwave radiation. In accordance with another embodiment, a method of fabricating a glass laminate is provided where the exposed area of the glass laminate is characterized by a viscosity below approximately 110.sup.4 poise.

Methods of fabricating a glass laminate is provided. According to one embodiment, a glass laminate comprised of a microwave absorbing layer and a microwave transparent layer is formed. The microwave absorbing layer is characterized by a microwave loss tangent .sub.H that is at least a half order of magnitude larger than a loss tangent .sub.L of the microwave transparent layer. An area of the glass laminate is exposed to microwave radiation. The exposed area comprises a cross-laminate hot zone having a cross-laminate hot zone temperature profile. Substantially all microwave absorbing layer portions of the hot zone temperature profile and substantially all microwave transparent layer portions of the hot zone temperature profile reside above the glass transition temperature T.sub.G of the various layers of the glass laminate prior to impingement by the microwave radiation. In accordance with another embodiment, a method of fabricating a glass laminate is provided where the exposed area of the glass laminate is characterized by a viscosity below approximately 110.sup.4 poise.

According to one embodiment, a method for forming a laminated glass sheet includes forming a multi-layer glass melt from a molten core glass and at least one molten cladding glass. The multi-layer glass melt has a width W.sub.m, a melt thickness T.sub.m and a core to cladding thickness ratio T.sub.c:T.sub.cl. The multi-layer glass melt is directed onto the surface of a molten metal bath contained in a float tank. The width W.sub.m of the multi-layer glass melt is less than the width W.sub.f of the float tank prior to the multi-layer glass melt entering the float tank. The multi-layer glass melt flows over the surface of the molten metal bath such that the width W.sub.m of the multi-layer glass melt increases, the melt thickness T.sub.m decreases, and the core to cladding thickness ratio T.sub.c:T.sub.cl remains constant as the multi-layer glass melt solidifies into a laminated glass sheet.

According to one embodiment, a method for forming a laminated glass sheet includes forming a multi-layer glass melt from a molten core glass and at least one molten cladding glass. The multi-layer glass melt has a width W.sub.m, a melt thickness T.sub.m and a core to cladding thickness ratio T.sub.c:T.sub.cl. The multi-layer glass melt is directed onto the surface of a molten metal bath contained in a float tank. The width W.sub.m of the multi-layer glass melt is less than the width W.sub.f of the float tank prior to the multi-layer glass melt entering the float tank. The multi-layer glass melt flows over the surface of the molten metal bath such that the width W.sub.m of the multi-layer glass melt increases, the melt thickness T.sub.m decreases, and the core to cladding thickness ratio T.sub.c:T.sub.cl remains constant as the multi-layer glass melt solidifies into a laminated glass sheet.

A low light transmission gray glass formed from a composition includes colorants. The colorants include 1.8 wt. % to 2.3 wt. % Fe.sub.2O.sub.3, 0.28 wt. % to 1.2 wt. % FeO, 0.030 wt. % to 0.040 wt. % Co.sub.3O.sub.4, 0.0020 wt. % to 0.010 wt. % Se, 0.00050 wt. % to 0.050 wt. % CuO, and 0.01 wt. % to 1 wt. % TiO.sub.2. The glass has a visible light transmission (T.sub.LA) of less than 15%, a direct solar transmittance (T.sub.DS) of less than 14%, an infrared radiation transmittance (T.sub.IR) of less than 14%, a UV light transmittance (T.sub.UV) of less than 8%, and a total solar transmittance (T.sub.TS) of less than 38%.

A low light transmission gray glass formed from a composition includes colorants. The colorants include 1.8 wt. % to 2.3 wt. % Fe.sub.2O.sub.3, 0.28 wt. % to 1.2 wt. % FeO, 0.030 wt. % to 0.040 wt. % Co.sub.3O.sub.4, 0.0020 wt. % to 0.010 wt. % Se, 0.00050 wt. % to 0.050 wt. % CuO, and 0.01 wt. % to 1 wt. % TiO.sub.2. The glass has a visible light transmission (T.sub.LA) of less than 15%, a direct solar transmittance (T.sub.DS) of less than 14%, an infrared radiation transmittance (T.sub.IR) of less than 14%, a UV light transmittance (T.sub.UV) of less than 8%, and a total solar transmittance (T.sub.TS) of less than 38%.

An inference method includes inferring a value that includes a stress value in a region located 50 m or shallower from a surface of a chemically strengthened glass, by receiving as input at least a temperature and a time used upon chemical strengthening, and stress values at three or more different depth positions 20 m or deeper from the surface of the chemically strengthened glass that has been obtained by chemically strengthening a glass having a thickness of 0.2 mm or greater with the temperature and the time.

An inference method includes inferring a value that includes a stress value in a region located 50 m or shallower from a surface of a chemically strengthened glass, by receiving as input at least a temperature and a time used upon chemical strengthening, and stress values at three or more different depth positions 20 m or deeper from the surface of the chemically strengthened glass that has been obtained by chemically strengthening a glass having a thickness of 0.2 mm or greater with the temperature and the time.

A method includes supplying a conjoined molten glass stream to an overflow distributor. A cross section of the conjoined molten glass stream includes a first cross sectional portion and a second cross sectional portion. The first cross sectional portion includes a first glass composition. The second cross sectional portion includes a second glass composition different than the first glass composition. The first glass composition is flowed over a first transverse segment of a weir of the overflow distributor. The second glass composition is flowed over a second transverse segment of the weir of the overflow distributor.