Certified inorganic biding agent for inorganic thermally insulating fibers and inorganic thermally insulating fibers comprising such binding agent

摘要

Described healthier inorganic binder comprising an aqueous solution of lithium silicate having a concentration of 1 to 30 wt%. lithium silicate, preferably 10 to 25 wt%. In this solution, the molar ratio SiO.sub.2.n.:Li.sub.2.nO is 1 to 50: 1, preferably 3 to 25: 1st This solution was further diluted with water at a ratio of 1:50 to 1: 100, preferably in a ratio of 1: 70 to 1: 100. Heat insulating inorganic fibers, preferably mineral or glass fibers have a surface layer containing 2 to 20 wt%. lithium silicate. This surface layer has a water absorption for 1 to 50 days from 0.5 to 4 wt%. water, preferably 0.7 to 1.3 wt%. and recoverable deformation in the range of 95 to 100%.