Perlite insulation board and method of making the same

摘要

A perlite insulation board is disclosed herein and includes, as conventional ingredients, expanded perlite, organic fiber and binder, the perlite, being the largest single ingredient, by dry weight, in the board. The insulation board also includes gypsum in an amount less than the perlite but preferably in an amount sufficient to form a gypsum matrix throughout the board. A method of making a perlite insulation board of the general type just described is also disclosed herein.