Patent ID: 6297182
Filing Date: 2001-10-02
Classification: C03C

Abstract:
A glass for a substrate consisting essentially of:SiO.sub.2 45 to 65 wt %,Al.sub.2 O.sub.3 6 to 20 wt %,B.sub.2 O.sub.3 1.0 to 6 wt %,MgO 2 to 5 wt %,CaO 1 to 10 wt %,SrO 0 to 6.5 wt %,BaO 0 to 2 wt %, MgO+CaO+SrO+BaO 10 to 17 wt %, ZrO.sub.2 0 to 7 wt %, and Na.sub.2 O+K.sub.2 O 7 to 13.2 wt %,having a glass transition point of at least 600.degree. C., and having a specific gravity of less than 2.65.