| 摘要 |
PURPOSE: To obtain a glass fiber low in dielectric constant and dielectric loss tangent and excellent in water resistance, workability and productivity by including SiO2 , Al2 O3 , B2 O3 , CaO+MgO and Li2 O+Na2 O+K2 O. CONSTITUTION: This glass fiber is obtained by compounding 50-65wt.% SiO2 with 11-20wt.% Al2 O3 , 20-30wt.% B2 O3 , 0-3.9wt.% CaO+MgO and 0-0.5wt.% Li2 O+Na2 O+K2 O and melting the mixture at 1500-1550 deg.C for 8hr under stirring and casting onto a carbon plate to afford glass cullet, feeding the glass cullet into a glass fiber producing furnace and melt-spinning the cullet at 1300-1420 deg.C. The glass fiber has e.g. <=4.2 dielectric constant at 1MHz frequency at an ambient temperature and <=8×10<-4> dielectric loss tangent.
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