Improved Cement for Firmly Binding Together Light Substances.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improved Cement for Firmly Binding Together Light Substances.
I, AUGUST HAFTER Manufacturer 75-77 Bishop Street Anderston Glasgow
do hereby declare the nature of this invention to be as follows :-
According to this invention, the binding qualities of clay, which are often made
use of for cementing together light substances like vegetable and textile fibres,
peat, sawdust, cork-shavings and the like are further improved by subjecting the
clay for some time to the action of an acid, and by preference to that of sulphuric
acid. Part of the basic elements of the clay thereby combine with the acid to
soluble sulphates of which, 100 parts of the treated mixture should contain at least
50 parts, so as to give it the proper binding consistency.
The quantity of acid to be added to the clay entirely depends on the percentage
of convertible basic salts contained in the clay; poor clays not yielding 50 parts
of sulphates in solution in 100 parts of mixture are made up to their proper density
by an addition of some soluble sulphate.
To the mixture so prepared I add 10 parts of an amylaceous substance, which
while neutralizing the mixture, passes into a mucilaginous state, and thereby
further increases the binding strength of the cement.
Dated this 17th day of May 1895.
I, AUGUST HAFTER Manufacturer 75-77 Bishop Street, Anderston Glasgow
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:
According to this invention, the binding qualities of clay, which are often made
use of for cementing together light substances such as vegetable and textile fibres,
peat, sawdust, cork-shavings and the like are further improved by subjecting the
clay for some time to the action of an acid, and by preference to that of sulphuric
acid.
The mixture after having been treated, with sulphuric acid for instance, must
contain in every 100 parts at least 50 parts of soluble sulphates, in order to give it
the proper binding consistency.
Since the percentage of the basic elements, convertible by the action of sulphuric
acid, greatly varies in different clays, the amount of the acid in treating any clay is
regulated by the quantity of its convertible basic components. Poor clays con-
taining only a small percentage of such salts, and in consequence do not yield
50 parts of sulphates in solution in 100 parts of the mixture may still be worked
up to their proper consistency by adding some soluble sulphate until the mixture
contains 50 parts thereof.

page_text: To 100 parts of so prepared cement, I add 10 parts of an amylaceous substance,
which while neutralizing the cement, passes into a mulcilaginous state, and thereby
further increases the binding strength of the cement.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what
I claim is:
1. The improvement of clay as a cement by treating it with acid, substantially
in the manner, and for the purposes as described.
2. The further treatment of the so prepared cement with an amylaceous
substance, substantially in the manner, and for the purposes as described.
Dated this 17th day of February 1896.
מחג
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IVH ISADAY