Microporous thermal insulation material

摘要

A microporous thermal insulation material is formed from an intimate mixture of a dry particulate microporous material and reinforcing glass filaments. The glass constituting the glass filaments contains not more than 1 per cent by weight Na2O and preferably has the following composition: -SiO250-100 percent by weight-Al2O3up to 25 percent by weight-B2O3up to 8 percent by weight-MgOup to 10 percent by weight-CaOup to 21 percent by weight-Na2Oup to 1 percent by weight-K2Oup to 2 percent by weight-Fe2O3up to 1 percent by weight-F2up to 1 percent by weight.-