Compositions with low dielectric losses

Details Compositions with low dielectric losses Compositions with low dielectric losses

C - Chemistry, Metallurgy

03

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C03C 3/091 (2006.01) C03C 3/087 (2006.01) C03C 3/108 (2006.01) C03C 3/118 (2006.01)

Patent

CA 1254733

ABSTRACT Alkali-free glasses with low dielectric losses having thermal expansion coefficients of 3.15 to 4.97 x 10-6/oC in the temperature range from 20 to 300°C, as well as with adequate acid resistance, dielectric loss factors tan .delta. of 3.94 to 24.9 x 10-4 and processing temperatures (VA) of 1132 to 1280°C , have the following composition ( in wt.o%): 52.50 - 60.20 SiO2 , 2-80 - 3.80 B2O3 , 8 - 14 A12O3 , 6.0 - 20.20 PbO, 2.0 - 13.5 CaO, 0 - 3.5 MgO, O - 8 ZnO, O - 4.7 BaO, E PbO,CaO,MgO,ZnO,BaO 21.10 - 34.0, O - 1.0 F, 0.20 - 0.50 Sb2O3 .

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