Patent ID: 7470641

Claim:
Thermal insulation for use in applications requiring continuous resistance to temperatures of 1260° C. without reaction with alumino-silicate firebricks, the insulation comprising fibres having a composition in wt % 72%<SiO 2 <86% 0<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*P 2 O 5 95%<SiO 2 +CaO+MgO+Al 2 O 3 +ZrO 2 +B 2 O 3 +P 2 O 5 .