Building board

Claim 2

A shaped article having low shrinkage characteristics when subjected to high temperatures in the order of at least 900° C, which comprises: a binder which has been caused to set by the action thereon of H 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° C to a value which is significantly less than the linear shrinkage of the article in the absence of said component.

Claim 3

A shaped article as defined in claim 1 wherein said component is present in an amount of at least 10% by weight.

Claim 4

A shaped article as defined in claim 1 wherein said water-settable binder is calcium silicate hydrate.

Claim 5

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 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° C to a value which is significantly less than the linear shrinkage of the article in the absence of said component.

Claim 6

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 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° C to a value which is significantly less than the linear shrinkage of the article in the absence of said component.

Claim 7

A building board as defined in claim 4 wherein said component is present in amount sufficient to restrict the linear shrinkage of the article to not more than about 3.5%.

Claim 8

A building board as defined in claim 4 wherein said component is present in amount of at least 10% by weight of binder plus said reinforcing fibers and said component.

Claim 9

A building board as defined in claim 6 including filler in amount of not more than 50% by weight of the building board.

Claim 10

A composition as claimed in claim 1 wherein said organic fibres are cellulose fibres.

Claim 11

A composition as claimed in claim 1 wherein the mica is muscovite, biotite or phlogopite.

Claim 12

A composition as claimed in claim 8 wherein the cellulose fibres are present in an amount of 2 to 15% by weight of the solids content of the composition.

Claim 13

A composition as claimed in claim 1 wherein said component has a particle size less than 2mm.

Claim 14

A composition as claimed in claim 1 which additionally contains inorganic fibrous reinforcing materials.

Claim 15

A composition as claimed in claim 12 wherein said additional fibrous materials includes fibres of glass, slag wook, rock wool, zirconium oxide, alumina, silica-alumina, aluminium silicate or of metal.

Claim 16

A composition as claimed in claim 12 wherein the inorganic fibrous reinforcing material constitutes from 0.5 to 95% by weight of the fibrous material in the composition.

Claim 17

A composition as claimed in claim 1 containing additionally a solid filler.

Claim 18

A composition as claimed in claim 15 wherein the filler is perlite.

Claim 19

A building board according to claim 4 consisting essentially of, by weight, 12 parts cellulose fibres, 31.8 parts lime, 29.2 parts quartz, 12 parts mica and 15 parts Portland cement.

Claim 20

A building board according to claim 4 consisting essentially of, by weight, 6 parts cellulose fibres, 6 parts glass fibres, 37.7 parts lime, 15.8 parts quartz, 21.5 parts diatomite and 13.0 parts vermiculite.

Claim 21

A building board according to claim 4 consisting essentially of, by weight, 10 parts cellulose fibres, 50 parts vermiculite, 21 parts lime and 19 parts quartz.

Claim 22

A building board according to claim 4 consisting essentially of, by weight, 12.0 parts cellulose, 31.8 parts lime, 29.2 parts quartz, 12.0 parts vermiculite and 15.0 parts Portland cement.

Claim 23

A building board according to claim 4 consisting essentially of, by weight, 10 parts cellulose, 42 parts lime, 21 parts quartz, 12 parts vermiculite and 15 parts Portland cement.

Claim 24

A building board according to claim 4 consisting essentially of, by weight, 12.5 parts cellulose, 35 parts lime, 32.5 parts silica and 20 parts vermiculite.

Claim 25

A building board according to claim 4 consisting essentially of, by weight, 12.5 parts cellulose, 25 parts lime, 22.5 parts silica and 40 parts vermiculite.

Claim 26

A building board according to claim 4 consisting essentially of, by weight, 10 parts cellulose, 2.5 parts glass fibre, 35 parts lime, 32.5 parts silica and 20 parts mica.

Claim 27

A building board according to claim 4 consisting essentially of, by weight, 10 parts cellulose, 2.5 parts glass fibre, 25 parts lime, 22.5 parts silica and 40 parts mica.

Claim 28

A building board according to claim 4 consisting essentially of, by weight, 7.5 parts cellulose, 37.5 parts lime, 35 parts silica and 20 parts mica.

Claim 29

A building board according to claim 4 consisting essentially of, by weight, 3 parts cellulose, 3 parts glass fibre, 32 parts lime, 32 parts silica, 15 parts mica and 15 parts vermiculite.

Claim 30

A building board according to claim 4 consisting essentially of, by weight, 3 parts cellulose, 10 parts rock wool fibre, 28.5 parts lime, 28.5 parts silica, 15 parts mica and 15 parts vermiculite.

Claim 31

A building board according to claim 4 consisting essentially of, by weight, 12.5 parts cellulose, 67.5 parts Portland cement and 20 parts vermiculite.

Claim 32

A building board according to claim 4 consisting essentially of, by weight, 12.5 parts cellulose, 47.5 parts Portland cement and 40 parts vermiculite.

Claim 33

A building board according to claim 4 consisting essentially of, by weight, 25.0 parts vermiculite, 7 parts glass fibre, 2.5 parts cellulose fibre, 20 parts diatomite, 10 parts silica and 35.5 parts lime.

Claim 34

A building board according to claim 4 consisting essentially of, by weight, 15 parts vermiculite, 10 parts mica, 3.0 parts cellulose fibre, 36 parts silica and 36 parts lime.

Claim 35

A building board according to claim 4 consisting essentially of, by weight, 25.0 parts vermiculite, 7 parts mica, 2.5 parts cellulose fibre, 20 parts diatomite, 10 parts silica and 35.5 parts lime.

Claim 36

A building board according to claim 1 consisting essentially of, by weight, 10 parts vermiculite, 3 parts cellulose, 84 parts Portland cement and 3 parts glass fibre.

Claim 37

A building board according to claim 4 consisting essentially of, by weight, 15 parts mica, 3 parts cellulose, 79 parts Portland cement, and 3 parts glass fibre.

Claim 38

A building board according to claim 4 consisting essentially of, by weight, 15 parts mica, 3 parts cellulose, 78.5 parts Portland cement and 3.5 parts parts steel fibre.

Claim 39

A building board according to claim 4 consisting essentially of, by weight, 15 parts mica, 3 parts cellulose, 72 parts Portland cement, and 10 parts mineral fibre.

Claim 40

A building board according to claim 4 consisting essentially of, by weight, 10 parts vermiculite, 15 parts mica, 3 parts cellulose, and 72 parts Portland cement.