Flat glass composition with improved melting and tempering...

Details Flat glass composition with improved melting and tempering... Flat glass composition with improved melting and tempering...

C - Chemistry, Metallurgy

03

C

261/16

C03C 3/087 (2006.01) C03C 3/083 (2006.01)

Patent

CA 2023115

A glass composition particularly suitable for flat glass manufacture having lower melting temperature, wide working range, improved surface durability, and enhanced tempering performance has the following composition : SiO2 66.0 - 69.1 weight percent Al2O3 2.0 - 4.0 (SiO2 + Al2O3) Less than 71.6 Na2O 15 - 19 K2O 0 - 2 (Na2O + K2O) 15 - 20 CaO 7.5 - 9 MgO 2 - 4 (CaO + MgO) 10.2 - 12.0 (CaO / MgO) 1.9 - 3.5

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