Patent ID: 7153796

Claim:
A silicate fibre comprising: 65%<SiO 2 <86% MgO<10% 14%<CaO<28% Al 2 O 3 <2% ZrO 2 <3% B 2 O 3 <5% P 2 O 5 <5% 72%<SiO 2 +ZrO 2 +B 2 O 3 +5*P2O 5 95%<SiO 2 +CaO+MgO+Al 2 O 3 +ZrO 2 +B 2 O 3 +P 2 O 5 0.1%<R 2 O 3 <4% where R is selected from the group Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y or mixtures thereof.