IMPROVEMENTS IN PREPARED SLAG WOOL FOR BUILD- INGS, FIRE AND SOUND PROOFING, AND OTHER TECHNICAL PURPOSES
Year: 1877

page_text: LETTERS PATENT to Charles Baatsch, of Newcastle Street, Farringdon Street,
for the Invention of "IMPROVEMENTS IN PREPARED SLAG WOOL FOR BUILD-
INGS, FIRE AND SOUND PROOFING, AND OTHER TECHNICAL PURPOSES."
PROVISIONAL SPECIFICATION left by the said Charles Baatsch at the Office
of the Commissioners of Patents on the 30th October 1877.
CHARLES BAATSCH, of Newcastle Street, Farringdon Street. "IMPROVEMENTS IN
PREPARED SLAG WOOL FOR BUILDINGS, FIRE AND SOUND PROOFING, AND OTHER
TECHNICAL PURPOSES."
Although slag wool is a non-conductor of heat, sound, and electricity, and also
incombustible, it has not yet been used for many technical purposes on account of
its giving rise to the emission of free sulphur, ether, and hydrogen, and filling the
air with fine penetrating dust.
My Invention does away with these two faults, and slag wool prepared according
to my Invention will neither dust nor emit sulphuretted hydrogen, even when
brought in contact with acids.
In order to prepare slag wool, I form it into pads or bricks shaped according to
the use the slag wool is destined for. For this purpose I use perforated moulds
made of any serviceable material (wirework, perforated, metal, wood, etc.). After
filling the moulds evenly, I dip them for a moment in diluted alkaline silicate of
105 to 115. The moulds are then emptied and fitted again and the bricks or
pads exposed to the air for about a week, by which they become hard on the
surfaces.
For certain purposes the moulds can be dispensed with, and the slag wool, where
its surfaces are exposed to the air, may be painted over with the above-mentioned
alkaline silicate.

page_text: My Invention is useful for many purposes; the slag wool so prepared can be
used, not only for lagging of boilers, steam pipes, hot and cold water pipes, but
also in dwelling houses for stuffing floors and partitions to make them fire and
sound proof. For these purposes it is the more adapted, as no vermin can live in it.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Charles Baatsch in the Great Seal Patent Office on the 29th April
1878.
CHARLES BAATSCH, of Newcastle Street, Farringdon Street. "IMPROVEMENTS IN
PREPARED SLAG WOOL FOR BUILDINGS, FIRE AND SOUND PROOFING, AND OTHER
TECHNICAL PURPOSES."
Although slag wool is a non-conductor of heat, sound, and electricity, and is also
incombustible, it has not hitherto been used for many technical purposes on account
of its giving rise to the emission of free sulphuretted hydrogen and filling the air
with fine penetrating dust.
to
My Invention does away with these objections, and slag wool prepared according
my Invention will neither dust nor emit sulphuretted hydrogen, even when
brought into contact with acids.
In preparing slag wool according to my Invention, I first form it into pads or
bricks, according to the use the slag wool is destined for. For this purpose I use
perforated moulds made of any suitable material, such as wirework, perforated
metal, or wood. After evenly filling the moulds, I dip them in diluted alkaline
silicate of about 1.05 to 1:15. The moulds are then emptied and again filled, and
the bricks or pads so formed are exposed to the air for about a week, by which
time they will become hard on the surfaces, or this hardening may be effected more
expeditiously by drying the pads or bricks in hot air, which may or may not be
mixed with carbonic acid.
For certain purposes the moulds can be dispensed with, and the slag wool, where
its surfaces are exposed to the air, may be painted over with the herein-before
described alkaline silicate.
My Invention is useful for many purposes; the slag wool so prepared can be used
not only for lagging boilers, covering steam pipes and hot and cold water pipes,
but also in dwelling houses for stuffing floors and partitions to make them fire
and sound proof. For these purposes it is the more specially adapted, as no vermin
can live in it.
When covering floors or roofs with slag wool, instead of employing bricks, I first
line or cover the floor or roof with cloth or paper well saturated with the herein-
before described liquid, and I then apply the slag wool in its natural condition over
this cloth or paper, and cover it with a similar coating of cloth or paper prepared
as herein-before described.
For covering steam boilers, steam pipes, hot and cold water pipes, and similar
articles, I apply the raw slag wool direct on the surface to be covered and then
cover the surface of the coating of slag wool with cloth or paper saturated as herein-

page_text: before described, over which may then be applied plaister of Paris in a powdered
state..
Having thus described my Invention and the best means I am acquainted with
for carrying the same into effect, I wish it to be understood that what I claim
is, the employment of alkaline silicate for preparing slag wool, as herein-before
described.
In witness whereof, I, the said Charles Baatsch, have hereto set my hand
and seal, this Twenty-ninth day of April, in the year of our Lord One
thousand eight hundred and seventy-eight.
CHARLES BAATSCH. (L.S.)