초록

Provided is a low iron containing glass particularly useful for automotive and architectural purposes which achieves low levels of UV, IR, and total solar (TS) transmittances without the use of nickel oxide, and in certain embodiments, through selective amounts of B.sub.2 O.sub.3.

대표청구항 ▼

[ We claim:] [1.] A substantially nickel-free soda-lime-silica glass having a base glass composition comprising on a weight percent basis:______________________________________ SiO.sub.2 68-75 Na.sub.2 O 10-18 CaO 5-15 MgO 0-5 Al.sub.2 O.sub.3 0-5 K.sub.2 O 0-5 ______________________________________

[ We claim:] [1.] A substantially nickel-free soda-lime-silica glass having a base glass composition comprising on a weight percent basis:______________________________________ SiO.sub.2 68-75 Na.sub.2 O 10-18 CaO 5-15 MgO 0-5 Al.sub.2 O.sub.3 0-5 K.sub.2 O 0-5 ______________________________________ colorants consisting essentially of by weight percent:______________________________________ Fe.sub.2 O.sub.3 (total iron) about 1.10-1.28 FeO about 0.22-0.33 Co.sub.3 O.sub.4 about 0.018-0.025 Se about 0.0022-0.0040 Cr.sub.2 O.sub.3 about 0.01-0.04 ______________________________________ rein the percent reduction of total iron to FeO is about 19% to 30% and wherein the glass, as measured at a nominal thickness of 4 mm has a luminous transmittance less than about 24%, a total solar energy transmittance of less than about 23% and has a color as defined by the following CIELAB coordinates: EQU L*=50.+-.10 EQU a*=-5.+-.5 EQU b*=0.+-.10.