Insulating compositions and structures formed therefrom for use in hot topping comprising fibrous wollastonite

Claim 2

The composition defined in claim 1 wherein said second fibrous material comprises a mixture of glass fibers and cellulosic pulp.

Claim 3

The composition defined in claim 1 wherein said inorganic particulate material comprises powdered Wollastonite.

Claim 4

The composition defined in claim 1 wherein said binder comprises a phenol-formaldehyde resin.

Claim 5

An insulating composition for use in hot topping comprising, on a dry basis, about 8 wt. % fibrous Wollastonite, about 4 wt. % second inorganic fibrous material, about 3 wt. % cellulosic pulp, about 80 wt. % powdered Wollastonite and about 5 wt. % phenol-formaldehyde resin binder.

Claim 6

An insulating composition for use in hot topping comprising, on a dry basis, about 94 wt. % fibrous Wollastonite, about 1 wt. % second inorganic fibrous material, about 2.5 wt. % cellulosic fiber, and about 2.5 wt. % resinous binder.

Claim 7

An insulating structure for use in hot topping defined by a body having a thickness within the range of about one-half inch to about 1 3/4 inch, at least in part formed of a composition comprising, on a dry basis, from about 5 to about 95 wt. % fibrous Wollastonite; at least about 3 wt. % of a second fibrous material selected from the group consisting of inorganic fibrous materials, organic fibrous materials and mixtures thereof, said inorganic fibrous material being present in an amount within the range of 0 to about 20 wt. % and said organic fibrous material being present in an amount within the range of 0 to about 8 wt. %; an inorganic particulate filler present in an amount within the range of 0 to about 90 wt. %; and from about 2 to about 8 wt. % of a binder selected from the group consisting of inorganic and organic binders.

Claim 8

The insulating structure defined in claim 8 wherein said body is formed entirely from said composition, said structure having a thickness within the range of about one-half to about 1 1/4 inches.

Claim 9

The insulating structure defined in claim 9 in the shape of a board.

Claim 10

The insulating structure of claim 9 in the shape of a curved board.

Claim 11

The insulating structure of claim 8 in the shape of a ring.

Claim 12

The insulating structure of claim 8 defining a gasket.

Claim 13

The insulating structure defined in claim 9 wherein said composition comprises, on a dry basis, about 8 wt. % fibrous Wollastonite, about 4 wt. % second inorganic fibrous material, about 3 wt. % cellulosic fiber, about 80 wt. % powdered Wollastonite and about 5 wt. % phenol-formaldehyde resin binder.