Patent ID: 7807594

Claim:
A glass fiber composition comprising: about 33-47 weight % SiO 2 ; about 18-28 weight % Al 2 O 3 ; about 5-15 weight % Fe 2 O 3 ; greater than or equal to about 2 weight % and less than 10 weight % R 2 O; about 8-30 weight % CaO; and less than 2 weight % MgO; wherein R 2 O represents alkali mental oxides, and wherein the glass fiber composition has a liquidus temperature of less than 2250° F.; and a viscosity at a liquidus temperature of the glass fiber composition of greater than 1,000 poise; and glass fiber formed from the glass fiber composition has a biodissolution rate of greater than 100 ng/cm 2 /hr.