Patent ID: 6897173

Claim:
A thermally stable mineral wool capable of dissolving in a physiological medium, said mineral wool comprising fibers comprising: SiO 2 in an amount of from 35 to 60%, Al 2 O 3 in an amount of from 12 to 27%, CaO in an amount of from 0 to 35%, MgO in an amount of from 0 to 30%, Na 2 O in an amount of from 0 to 17%, K 2 O in an amount of from 0 to 17%, R 2 O (Na 2 O+K 2 ) in an amount of from 10 to 17%, P 2 O 5 in an amount of from 0 to 5%, Fe 2 O 3 in an amount of from 0 to 20%, B 2 O 3 in an amount of from 0 to 8%, and TiO 2 in an amount of from 0 to 3%, wherein % is percent by weight, wherein a phosphorus compound is present, said phosphorous compound having a phosphorus content, expressed in P 2 O 5 form, from 0.2% to 5% of the total mass of fibers, wherein said phosphorous compound is capable of reacting above 100° C. with the fibers, to form a coating on the surface of the fibers.