초록 ▼

A neutral, dark gray, nickel-free, soda-lime-silica glass having luminous transmittance less than 20 percent is produced with colorants consisting essentially of 0.55 to 1.0 percent by weight total iron (at least 15 percent in the ferrous state), 0.005 to 0.02 percent CoO, and 0.003 to 0.02 percent

A neutral, dark gray, nickel-free, soda-lime-silica glass having luminous transmittance less than 20 percent is produced with colorants consisting essentially of 0.55 to 1.0 percent by weight total iron (at least 15 percent in the ferrous state), 0.005 to 0.02 percent CoO, and 0.003 to 0.02 percent Se. The flat glass product having such a composition is particularly suitable for use in sun roofs.

대표청구항 ▼

A neutral gray colored glass composition having a base glass composition comprising: ________________________________ -SiO2 68-75 percent by weight Na2O 10-18 CaO 5-15 MgO 0-5 Al2O3 0-5 K2O 0-5 ________________________________ and traces of melting and refining aids, if any, and colorants consisting

A neutral gray colored glass composition having a base glass composition comprising: ________________________________ -SiO2 68-75 percent by weight Na2O 10-18 CaO 5-15 MgO 0-5 Al2O3 0-5 K2O 0-5 ________________________________ and traces of melting and refining aids, if any, and colorants consisting essentially of: ________________________________ -Fe2O3 (total iron) 0.6-1.0 percent by weight Se 0.005-0.02 CoO 0.01-0.02 ________________________________ at least 15 percent of the iron being in the ferrous state, the glass having a luminous transmittance of no more than 20 percent and total solar energy transmittance less than 40 percent at a thickness of 0.219 inch (5.56 millimeters).