LIGHTWEIGHT BOARD WITH FACER SHEETS BONDED TO CORE INCLUDING PARTIALLY CRUSHED EXPANDED SILICEOUS PARTICLES & METHODS OF MAKING

摘要

A lightweight wallboard having a density in the range of 10 pcf to 30 pcf and comprised of a faced layer of expanded siliceous inorganic particles, such as expanded perlite, bonded together by inorganic binder, such as sodium silicate. The board is made by depositing a mixture of particles, binder and water onto a moving web of facing material, contacting the mixture with an upper moving web of facing material, compacting the mixture to the desired shape and density and drying the resulting board. Fire resistant and water repellent versions of the formula are also disclosed.