Building board
AssigneeCape Boards & Panels Ltd.
InventorVictor Ernest Barrable
Life of this patent
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Abstract
An asbestos-free composition suitable for the manufacture of shaped articles comprising (a) a water-settable inorganic binder which is one or more of a calcium silicate binder (or compounds necessary for the formation thereof), Portland cement, aluminous cement and blast furnace slag cement, (b) organic reinforcing fibres and (c) mica and/or vermiculite. The composition may be shaped on conventional shaping, e.g. boardmaking, machinery and the products have superior fire and shrinkage resistance.
Claims38
A shaped article having low shrinkage characteristics when subjected to high temperatures in the order of at least 900.degree. C, which comprises:
- a binder which has been caused to set by the action thereon of H.sub.2 O and reinforcing fibers, said binder being present in amount of 50-99% by weight of binder and reinforcing fibers, and said reinforcing fibers including organic fibers and excluding asbestos fibers;
- and
- a component, selected from the group consisting of mica and a mixture of mica and vermiculite, in amount of not more than 60% by weight of binder plus reinforcing fibers and component and sufficient to restrict the linear shrinkage of the article when the article is subjected to a temperature at least in the order of 900.degree. C to a value which is significantly less than the linear shrinkage of the article in the absence of said component.
A building board which may be used to provide a fire resistant structure, comprising:
- a binder which has been caused to set by the action thereon of H.sub.2 O and reinforcing fibers, said binder being present in amount of 50-99% by weight of binder and reinforcing fibers, and said reinforcing fibers including organic fibers and excluding asbestos fibers;
- and
- a particulate component selected from the group consisting of mica, vermiculite and mixtures thereof, said component having a particle size such that at least 95% by weight thereof is of particle size less than 0.6 mm, and said component being present in an amount not more than 60% by weight and sufficient to restrict the linear shrinkage to the article when subjected to a temperature of at least 900.degree. C to a value which is significantly less than the linear shrinkage of the article in the absence of said component.
Dependencies are inferred from the claim text.