Boards
AssigneeRedland Technology Limited
InventorsGeoffrey W. Aston, Susan Smith, Paul Chapman, Howard A. Barker
Life of this patent
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Abstract
A board of sandwich construction which comprises two outer preformed support membranes consisting of or comprising fibrous material, the said membranes having interposed therebetween an aerated intermediate layer comprising at least 70% by weight based on the dry board of an unfired clay which contains less than 20% by weight of expandable minerals and the intermediate layer also including fibres therein. The boards of the present invention are intended mainly for use as plasterboard substitute.
Claims17
In a board of sandwich construction which comprises two outer preformed support membranes consisting of or comprising fibrous material, the said membranes having interposed therebetween an intermediate layer, the improvement which comprises the said intermediate layer being aerated, the said intermediate layer consisting of at least 70% by weight based on the dry board of an unfired clay which contains less than 20% by weight of expandable minerals and the said intermediate layer including fibres therein.
Dependencies are inferred from the claim text.