An Improved Process for the Manufacture of Water and Acid Proof Non-conducting Artioles of Clay.
Year: 1898

page_text: Date of Application, 8th June, 1898-Accepted, 22nd Oct., 1898
DI PULTIVATION,
An Improved Process for the Manufacture of Water and Acid Proof
Non-conducting Artioles of Clay.
We, WILHELM VAN DEN BERG, of No. 25, Hospitalstrasse, Dulken, Rhineland,
in the German Empire, Painter, and THEODOR HAASS, of No. 6, Wettsteinplatz,
Muttenz, near Bale, Switzerland, Manufacturer, do hereby declare the nature of
this invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
This invention relates to a process for the manufacture of articles of clay of
any kind, such as tiles for roofs on walls, window sills, insulating plates, pipes,
flooring slabs, and the like, so as to render them impervious to water, and unsus-
ceptible to the influence of weather and temperature, or acids.
The process consists in the treatment of such articles, immediately after they
have been dried or burnt and before they can take up moisture, with molten
asphalt or pitch, either separate or mixed, and with or without the addition of
gum, oil, fat or resin of any suitable kind, in such a manner they the articles are
thoroughly permeated by such substance or substances
We may use varying proportions of both mineral and tar asphalt in combina-
tion with resins and fats We preferably use maneral asphalt which has the
advantage over tar asphalt of being less inflammable Still, we may replace the
mineral asphalt entirely or in part by tar asphalt The addition of drying oils such
as linseed oil is preferably in the proportion of fiom 10 to 15% which addition
serves to overcome the brittleness of the material and also renders it fit for serving
as a base for painting.
Resins, rosin, various kinds of fats and waxes, mineral wax such as ozokerite,
are preferably added in the proportion of about 30%, and are especially made use
of in the manufacture of pipes, tiles, and the like. While the proportions of resin
may exceed 30% it is better not to use more than 10% of the fats and waxes if
those are used alone without any further addition
They
After such treatment, the articles are removed, allowed to cool, and dried
may then be dipped in any of the before mentioned substances or painted therewith
in order to give them a glazed appearance.
The treatment may be rendered more effective by subjecting the articles during
treatment to pressure in closed receptacles
It is advisable to burn the articles only moderately, because excessive kiln-
drying or burning reduces the receptiveness of the articles to the mass with which
they are subsequently to be treated in the described manner. The usual finishing
process after kiln-drying or burning becomes unnecessary
Articles thus manufactured are scarcely if at all, dearer than articles of clay
made in the usual manner, on account of the great saving of fuel They are as
durable as slate or the best metal lining or covering, and have the further
advantage of reduced conductivity for heat, electricity or sound and are unaffected
by atmospheric influences heat or acids.
Such articles are therefore suitable, as before mentioned, for all building pur-

page_text: poses where usually ordinary burnt clay goods or equivalent articles are used,
for roofing, pipes, earth and water-works, and for electric conduits. When used
for canalisation and water pipes, flooring, or similar purposes, a further advantage
is that the presence of germs of disease is excluded by the treatment with asphalt
or substances containing tar.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1st. A process for the manufacture of water and acid proof articles from clay by
the treatment of the article directly after drying or burning, with asphalt or pitch
or both substantially as and for the purpose described
2nd. In such a process as claimed in Claim 1, the addition of resin gum, fat or
oil in varying proportion to the impregnating mass of asphalt or pitch or both,
substantially as and for the
purpose
described
Dated this 8th day of June 1898.
FELL & JAMES,
Agents for the Applicant.