An Improved Process for Rendering Wood Incombustible.
Year: 1885

page_text: An Improved Process for Rendering Wood Incombustible.
I GEORGE FREDERICK REDFERN, of the General Patent Office, N° 4, South
Street, Finsbury, in the County of Middlesex, Patent Agent, do hereby declare the
nature of the said invention for "AN IMPROVED PROCESS FOR RENDERING WOOD
INCOMBUSTIBLE a communication from abroad by Rudolf Tanczos, of Vienna, in
the Empire of Austria, Safe Manufacturer, to be as follows:-
"
According to this invention, the wood to be rendered incombustible is first well
dried and afterwards impregnated with a solution of about four parts by weight
of borax (biborate of soda) and about three parts by weight of Epsom or bitter
salt (sulphate of magnesia) in about twenty parts by weight of hot water. The
impregnated wood is coated with a mixture of washed clay and a sufficient quantity
of liquid water-glass (by preference soda-water-glass) to enable the mass to be
applied by means of a paint brush. The wood having again become dry it is
covered with paper or with woven fabric (by preference a coarse linen fabric) the
said paper or other fabric having likewise been impregnated with the hereinbefore
described solution of borax and Epsom or bitter salt. Lastly, the whole is painted
over with a mixture of from thirty to forty parts by weight of sulphate of
ammonia and from thirty five to forty five parts by weight of gypsum (hydrated
sulphate of lime), diluted with a sufficient quantity of water.

page_text: I GEORGE FREDERICK REDFERN of the General Patent Office, N° 4 South
Street, Finsbury, in the County of Middlesex, Patent Agent do hereby declare the
nature of this invention (a communication from abroad by Rudolf Tanczos, of
Vienna, in the Empire of Austria, Safe Manufacturer) and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement :-
According to this invention, the wood to be rendered incombustible is first well
dried and afterwards impregnated with a solution of about four parts by weight
of borax (biborate of soda) and about three parts by weight of Epsom or bitter
salt (sulphate of magnesia) in about twenty parts by weight of hot water. The
impregnated wood is coated with a mixture of washed clay and a sufficient quantity
of liquid water-glass (by preference soda-water-glass) to enable the mass to be
applied by means of a paint brush. The wood having again become dry it is
covered with paper or with woven fabric (by preference a coarse linen fabric) the
said paper or other fabric having likewise been impregnated with the hereinbefore
described solution of borax and Epsom or bitter salt. Lastly the whole is painted
over with a mixture of from thirty to forty parts by weight of sulphate of
ammonia and from thirty five to forty five parts by weight of gypsum (hydrated
. sulphate of lime) diluted with a sufficient quantity of water to allow of the mass
being conveniently spread.
When treated in the manner described the wood is particularly fitted for use as
a filling or packing for the sides of safes, cash-boxes and the like for which purpose
ashes have been hitherto employed. It is obvious that by the described process
either the whole boards out of which the filling or packing is to be made or the
ready made filling or packing can be rendered fire proof.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:
The herein described process of rendering wood incombustible, the said process
consisting in impregnating well dried wood with a warm aqueous solution of borax
and Epsom or bitter salt then drying the same and coating it with a mixture of
washed clay and water-glass after which the wood is covered with paper or a woven
fabric previously impregnated with the aforesaid solution of borax and Epsom or
bitter salt and painted over with a mixture of sulphate of ammonia, gypsum and
water substantially as hereinbefore described.