IMPROVEMENTS IN THE MANUFACTURE OF FIREPROOF BLOCKS OR SLABS FOR PREVENTING THE TRANSMISSION OR RADIATION OF HEAT
Year: 1884

page_text: I CHARLES TOOPE of Stepney in the County of Middlesex, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN THE MANUFACTURE OF
FIREPROOF BLOCKS OR SLABS FOR PREVENTING THE TRANSMISSION OR RADIATION
OF HEAT," and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :—
My Invention relates to the manufacture of hard coherent fireproof blocks or
slabs from silicate cotton, asbestos fibre, a solution of silicate of soda and pipe-clay..
The fire-proof blocks or slabs when made of the proper shape suited to that
particular purpose, are especially adapted for protecting the joists of buildings,
according to the method for which I have made application for Letters Patent of
even dute herewith (N° 7342) but they may be made of various shapes, and be used
for covering steam boilers, fire proofing wooden structures and preventing the
radiation and transmission of heat generally.
The blocks or slabs may be composed of either the silicate cotton or asbestos
fibre alone, in conjunction with the silicate of soda and pipe clay, or they may be
composed of a mixture of silicate cotton and asbestos fibre in any suitable
proportion, in conjunction with the silicate of soda and pipe clay.
The proportion of the silicate of soda and pipe clay employed would in either
case depend upon the quality of these latter ingredients, so that general indications
only can be here given.
In manufacturing the blocks or slabs I mix about 8 lbs. of pipe-clay with about
eight gallons of water, and add to this mixture about one gallon of silicate of soda
and then add sufficient silicate cotton or asbestos fibre (or a mixture of the two) to.
form a plastic mass. The whole is thoroughly incorporated in a pug mill or
otherwise.
The material is then rammed into moulds of the desired shape, and the blocks or
slabs turned out are baked in ovens at a temperature of about 175° F. until they
are thoroughly dry.
The blocks or slabs may be coated with asbestos sheeting or asbestos paper to
give them a smooth surface and this may either be done after the blocks or slabs
are produced or in the operation of moulding. In the latter case sheets or strips
of the asbestos sheeting of the proper shape would be laid in the moulds before the.

page_text: introduction of the plastic mass of composition, which is then filled into the mould
and adheres to the said sheeting or paper.
In the former case the said sheeting or paper would be cemented to the blocks &c.
after they have been baked by a cement composed of pipe-clay and silicate of soda
in suitable proportions.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what
I claim is
1st The manufacture of fire-proof blocks or slabs from silicate cotton or asbestos
fibre, (or a mixture of the two) a solution of silicate of soda and pipe-clay,
substantially as herein specified.
2nd The manufacture of fire proof blocks or slabs from silicate cotton or asbestos
fibre (or a mixture of the two) and a solution of silicate of soda and pipe clay
substantially as specified in combination with an external coating of asbestos
sheeting or asbestos paper applied either after the blocks are produced or in the
operation of moulding as described.