A process for the preparation of a fire-retardant or non-flammable, in particular used for lining purposes the chipboard

摘要

By a method of producing a fire- retardant or non-inflammable chipboard, particularly for coating purposes, the wooden chips are impregnated with ammonium sulphate prior to glueing, and after glueing the chips are mixed with unglued vermiculite and then the mixture is compressed to form a board. The proportion of impregnated wooden chips is preferably selected so as to mount to more than 50% of the mixture.