LIGHTWEIGHT, HEAT INSULATING, HIGH MECHANICAL STRENGTH SHAPED PRODUCT AND METHOD OF PRODUCING THE SAME

摘要

This invention relates to a process of a lightweight, heat insulating, high compressive strength, water insoluble material by heat treatment at temperatures between 650-950~C, possessing a low bulk density (from 300 to 8 00 kg/m3) and improved heat insulating capacity (.lambda.=0.07 to 0.25 W/m.deg. ) when it has been used to form an article having a compressive strength of fr om 0.49 to 5.59 Mpa. The starting chemical composition comprising more than 90% by weight of either perlite, pumice or pumice related group of materials or mixture of them and an additive in quantities less than 10% by weight containing Na2O and B2O3.