MENTS IN PROTECTING WOOD AND OTHER SURFACES AGAINST FIRE TRANSMISSION OF HEAT, AND IN PAINTS OR COMPOSITIONS THEREFOR
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Daniel Henry Dade at the Office of
the Commissioners of Patents on the 5th September 1883.
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IMPROVE-
AND
DANIEL HENRY DADE of Denmark Hill in the County of Surrey
MENTS IN PROTECTING WOOD AND OTHER SURFACES AGAINST FIRE
TRANSMISSION OF HEAT, AND IN PAINTS OR COMPOSITIONS THEREFOR
The object of this invention is mainly to protect wood and other surfaces either
of an inflammable nature or not against the influence of fire so as to resist it at least
for some time sufficient to prevent it from spreading and thus to gain time for
extinguishing it.
According to this invention I coat wooden and other surfaces with a silicate
cotton paint or composition and then with a mica or asbestos paint.
The silicate cotton paint or composition is made by mixing ground powdered
silicate cotton with a solution of silicate of soda. As an example I may use one
part of silicate of soda of about 38° Beaumé with two parts of water and mix this
with the silicate of cotton to the consistency of a thick dough. I then dilute it
with silicate of soda solution so that it assumes the consistency of more or less thick
paint or composition so that it can be applied by a brush, or otherwise.
I coat the surface with one to three coats of the paint or composition all
according to the consistency and according to requirements.
The aforesaid mica or asbestos paint is made as follows: I mix ground powdered
mica and asbestos with a small quantity of barytes and sulphate of lime and add a
silicate of soda solution to a consistency of a paint to be applied by a brush.
Pigments or colouring matter may be added as required.
A paint consisting of asbestos and silicate of soda has heretofore been applied
with the view of rendering wood and other surfaces fire-resisting, but although
asbestos itself will not be consumed by fire yet it becomes incandescent by a high
heat, and this heat is conveyed to the wood. But by my invention I interpose &
heat non-conducting medium such as a comparatively thick layer of the aforesaid
silicious paint between the outer mica and asbestos paint and the wood and thus
protect the latter.

page_text: The aforesaid silicate cotton paint or composition may be used alone for the
purpose of affording a certain amount of protection against fire or heat and also
against the rays of the sun, for instance for roofs and other parts exposed to a
fierce sun heat especially in tropical climates, also for the purpose of keeping tanks,
pipes and other liquid containers cool in summer and free from the action of frost
in winter, also to ice and most safes and refrigerating apparatus, and provision
trucks.
For some of the above purposes I may use a compound made of the two paints
or compositions.
For such purposes where the non-radiation of beat only is an object and where
the paint would not be exposed to a higher degree of heat than that of boiling
water or even high pressure steam I may incorporate with the above silicate
cotton paint ground powdered wood pulp or other paper pulp and powdered
charcoal.
As an outer coating for any of the above paints or compositions I may employ
aizo or varnish or a paint consisting of silicate cotton, mica or asbestos barytes
colouring matter, and oil, varnish and dryers as for ordinary oil paint.