Patent ID: 7767606

Claim:
A composition for preparing E-glass fibers comprising: B 2 O 3 in an amount from 8-10% by weight of the total composition, CaO in an amount from 16-23% by weight of the total composition, Al 2 O 3 in an amount from 12-14% by weight of the total composition, SiO 2 in an amount from 52-54% by weight of the total composition, Fe 2 O 3 in an amount from 0-0.8% by weight of the total composition, TiO 2 in an amount from 0-1.5% by weight of the total composition, MgO in an amount from 0-3% by weight of the total composition, F 2 in an amount from 0-1% by weight of the total composition, Na 2 O in an amount from 0-2% by weight of the total composition, K 2 O in an amount from 0-2% by weight of the total composition, Li 2 O in an amount from 0-3% by weight of the total composition, and ZnO in an amount from 0-4% by weight of the total composition wherein said composition has a log 3 temperature less than or equal to 2100° F.