Abstract:
A plasterboard comprises a gypsum matrix having a polymeric additive distributed therein in an amount of at least 1 wt% relative to the gypsum, the gypsum matrix further having a first group of fibres and a second group of fibres embedded therein, wherein the fibres of the first group of fibres have an average length that is at least three times the average length of the fibres of the second group of fibres.
Abstract:
A gypsum product has a first polymeric additive and a second polymeric additive distributed therein, wherein the first polymeric additive is a synthetic polymer and the second polymeric additive is starch. It has been found that the combination of starch and a synthetic polymer may result in one or more of the following advantages in the manufacture and performance of gypsum products: -increased strength; -greater ease of manufacturing due to the increased fluidity of stucco slurries containing both additives; and -increased resistance to hygroscopic expansion.
Abstract:
A plasterboard comprises a gypsum matrix having particles of agglomerated fibres embedded therein in an amount of at least 1 wt% relative to the gypsum, the gypsum matrix further comprising a polymeric additive, the polymeric additive being present in an amount of at least 1 wt% relative to the gypsum.
Abstract:
A method of producing a gypsum product comprises the steps of: preparing a stucco slurry; adding starch-containing flour to the slurry in an amount of at least 2 % relative to the dry weight of the stucco; and allowing the stucco slurry to set.
Abstract:
The invention provides a calcium sulphate-based product comprising a phosphate additive for increased fire resistance. Particularly preferred phosphate additives may be those containing aluminium or ammonium ions.