Patent ID: 7612002

Claim:
A glass reinforcement strand, comprising glass having the following composition in percentages by weight: SiO 2 50 to 60%; Al 2 O 3 10 to 19%; B 2 O 3 16 to 25%; ZrO 2 0.5 to 1.5%; Na 2 O ≦1.5%; K 2 O ≦1.5%; R 2 O ≦2% CaO ≦10%; MgO ≦10%; F 0 to 2%; TiO 2 0 to 3%; RO 4 to 15%; and Various ≦3%, where R 2 O = Na 2 O + K 2 O + Li 2 O and RO = CaO + MgO.