Method of reducing redox ratio of molten glass and the glass made thereby

A soda-lime-silica glass, comprising:

• SiO2
• 65-75
• weight percent
• Na2O
• 10-20
• weight percent
• CaO
• 5-15
• weight percent
• MgO
• 0-5
• weight percent
• Al2O3
• 0-5
• weight percent
• K2O
• 0-5
• weight percent
• SO3
• 0-0.30
• weight percent
• and a colorant portion consisting essentially of:
• Total iron as Fe2O3
• 0.005-0.025 weight percent,
• Redox ratio
• less than 0.350,
• CeO2
• less than 0.0025 weight percent,
• ZrO2
• less than 0.01 weight percent and
• TiO2
• less than 0.01 weight percent, and
• wherein spectral properties of the glass measured at a thickness 5.5 millimeters comprises:
• a visible transmission of greater than 90% measured using C.I.E. standard illuminant “A” with a 2° observer over a wavelength range of 380 to 770 nanometers;
• a total solar infrared transmittance of greater than 90% measured over a wavelength range of 775 to 2125 nanometers, and
• a total solar energy transmittance of greater than 90% measured over a wavelength range Of 300 to 2500 nanometers, wherein the total solar infrared transmittance and the total solar energy transmittance are calculated using Parry Moon air mass 2.0 direct solar irradiance data and ASTM air mass 1.5 global solar irradiance data respectively, and integrated using the Rectangular Rule and Trapezoidal Rule, respectively.

A soda-lime-silica glass, comprising:

• SiO2
• 65-75
• weight percent
• Na2O
• 10-20
• weight percent
• CaO
• 5-15
• weight percent
• MgO
• 0-5
• weight percent
• Al2O3
• 0-5
• weight percent
• K2O
• 0-5
• weight percent
• SO3
• 0-0.30
• weight percent
• and a colorant portion consisting essentially of:
• Total iron as Fe2O3
• 0.005-0.025 weight percent
• Redox ratio
• less than 0.200
• CeO2
• less than 0.0025 weight percent
• ZrO2
• less than 0.01 weight percent and
• TiO2
• less than 0.01 weight percent, and
• wherein spectral properties of the glass measured at a thickness 5.5 millimeters comprises:
• a visible transmission of greater than 85% measured using C.I.E. standard illuminant “A” with a 2° observer over a wavelength range of 380 to 770 nanometers;
• a total solar infrared transmittance of greater than 87% measured over a wavelength range of 775 to 2125 nanometers, and
• a total solar energy transmittance of greater than 90% measured over a wavelength range of 300 to 2500 nanometers, wherein the total solar infrared transmittance and the total solar energy transmittance are calculated using Parry Moon air mass 2.0 direct solar irradiance data and ASTM air mass 1.5 global solar irradiance data respectively, and integrated using the Rectangular Rule and Trapezoidal Rule, respectively.

A soda-lime-silica glass, comprising:

• SiO2
• 65-75
• weight percent
• Na2O
• 10-20
• weight percent
• CaO
• 5-15
• weight percent
• MgO
• 0-5
• weight percent
• Al2O3
• 0-5
• weight percent
• K2O
• 0-5
• weight percent
• SO3
• 0-0.30
• weight percent
• and a colorant portion consisting essentially of:
• Total iron as Fe2O3
• equal to or less than
• 0.01 weight percent,
• Redox ratio
• less than 0.200
• CeO2
• less than 0.0025 weight percent
• ZrO2
• less than 0.01 weight percent and
• TiO2
• less than 0.01 weight percent, and
• wherein spectral properties of the glass measured at a thickness 5.5 millimeters comprises:
• a visible transmission of greater than 85% measured using standard illuminant “A” with a 2° observer over a wavelength range of 380 to 770 nanometers;
• a total solar infrared transmittance of greater than 87% measured over a Wavelength range of 775 to 2125 nanometers, and
• a total solar energy transmittance of greater than 90% measured over a wavelength range of 300 to 2500 nanometers, wherein the total solar infrared transmittance and the total solar energy transmittance are calculated using Parry Moon air mass 2.0 direct solar irradiance data and ASTM air mass 1.5 global solar irradiance data respectively, and integrated using the Rectangular Rule and Trapezoidal Rule, respectively.

A soda-lime-silica glass, comprising:

• SiO2
• 65-75
• weight percent
• Na2O
• 10-20
• weight percent
• CaO
• 5-15
• weight percent
• MgO
• 0-5
• weight percent
• Al2O3
• 0-5
• weight percent
• K2O
• 0-5
• weight percent
• SO3
• 0-0.30
• weight percent
• and a colorant portion consisting essentially of:
• Total iron as Fe2O3
• greater than 0.01 to 0.12
• weight percent,
• Redox ratio is
• less than 0.150,
• CeO2
• less than 0.0025 weight percent,
• ZrO2
• less than 0.01 weight percent and
• TiO2
• less than 0.01 weight percent, and
• wherein spectral properties of the glass measured at a thickness 5.5 millimeters comprises:
• a visible transmission of greater than 85% measured using C.I.E. standard illuminant “A” with 2° observer over a wavelength range of 380 to 770 nanometers;
• a total solar infrared transmittance of greater than 87% measured over a wavelength range of 775 to 2125 nanometers, and
• a total solar energy transmittance of greater than 90% measured over a wavelength range of 300 to 2500 nanometers, wherein the total solar infrared transmittance and the total solar energy transmittance are calculated using Parry Moon air mass 2.0 direct solar irradiance data and ASTM air mass 1.5 global solar irradiance data respectively and integrated using the Rectangular Rule and Trapezoidal Rule, respectively.