Inventors:
Vernon J. Grebe - Baltimore MD
Elie E. Saad - Burtonsville MD
Derek W. Sproson - Baltimore MD
Arthur C. Stidham - Baltimore MD
Assignee:
Miles Inc. - Pittsburgh PA
International Classification:
C03C 3089
Abstract:
The present invention is directed to an alkali borosilicate frit which is capable of being applied to a metal substrate by the dry powder electrostatic process at a transfer efficiency of at least 70%, has a glass transition temperature of >525. degree. C. and contains, based on the total weight of the frit: ______________________________________ Oxide Wt % ______________________________________ K. sub. 2 O 6 to 10 Na. sub. 2 O 5. 5 to 9 LiO. sub. 2 0 to 4 ZrO. sub. 2 0 to 4 TiO. sub. 2 0 to 4 ZnO 0 to 15 B. sub. 2 O. sub. 3 8 to 15 SiO. sub. 2 40 to 60 La. sub. 2 O. sub. 3 3 to 9 CaO 0 to 15 F 0 to 2 Fe. sub. 2 O. sub. 3 0 to 3 CoO 0 to 5 NiO 0 to 5, ______________________________________ wherein the total weight of CoO plus NiO is at least 1.