Patent ID: 7842631
Filing Date: 2010-11-30
Classification: C03C,Y10T

Abstract:
1. A glass composition having comprising: about 55.0-62.2 weight % SiO about 12.9-15.5 weight % Na about 8.0-11.2 weight % B about 4.0-8.0 weight % CaO; about 0.9-5.6 weight % Al about 3.0-5.0 weight % MgO; about 0.2-1.4 weight % K about 0.0-1.0 weight % F a softening point in the range of about 1230-1276° F.; a log-3 viscosity temperature in the range of about 1802-1879° F.; and a liquidus temperature in the range of about 1635-1780° F.