MICROPOROUS THERMAL INSULATION MATERIAL

摘要

A microporous thermally insulating material comprising 40 to 90 per cent by weight aluminium oxide; a zirconium silicate opacifier; and filaments select ed from calcium magnesium silicate filaments, polycrystalline alumina filaments , glass filaments and mixtures thereof. The glass filaments have a boron oxide content of less than 1 per cent by weight and a combined sodium oxide and potassium oxide content of less than 1 per cent by weight.