Lithia-alumina-silica containing glass compositions and...

Details Lithia-alumina-silica containing glass compositions and... Lithia-alumina-silica containing glass compositions and...

2011-01-18

2011-01-18

Blackwell, Gwendolyn (Department: 1784)

Stock material or miscellaneous articles

Surface property or characteristic of web, sheet or block

Surface modified glass

C428S409000, C428S426000, C428S428000, C428S432000, C501S055000, C501S063000, C501S065000, C501S066000, C501S067000, C501S068000, C501S069000, C501S070000, C501S072000

Reexamination Certificate

active

07871703

ABSTRACT:
A glass composition for chemical tempering includes oxides in wt % ranges of: SiO260 to 75; Al2O318 to 28; Li2O 3 to 9; Na2O 0 to 3; K2O 0 to 0.5; CaO 0 to 3; MgO 0 to 3; ZrO20 to 3; where MgO+CaO is 0 to 6 wt %; Al2O3+ZrO2is 18 to 28 wt %, and Na2O+K2O is 0.05 to 3.00 wt %. The glass has a log 10 viscosity temperature in the temperature range of 1328° F. (720° C.) to 1499° F. (815° C.); a liquidus temperature in the temperature range of 2437° F. (1336° C.) to 2575° F. (1413° C.), and a log 7.6 softening point temperature in the temperature range of 1544° F. (840° C.) to 1724° F. (940° C.). The chemically tempered glass has, among other properties, an abraded modulus of rupture of 72 to 78 KPSI, and a modulus of rupture of 76 to 112 KPSI.

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Kloss, T. et al., “Advances in the Process of floating borosilicate Glass and Some Recent Applications for Borosilicate Glass,” Journal of Glass Technology, vol. 4, No. 6., pp. 177-181 (Dec. 2000).

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