An Improved Asbestos Compound especially Applicable for Use as Boards or Sheathing for Roofings, Wearing Surfaces of
Year: 1884

page_text: An Improved Asbestos Compound especially Applicable for Use
as Boards or Sheathing for Roofings, Wearing Surfaces of
I, DAVID HUNTER BRANDON of the firm of Brandon & Sons, 114a Queen Victoria
Street E.C. London & 1 rue Laffitte Paris, France, Engineers & patent agents, do
hereby declare the nature of the invention for ". AN IMPROVED ASBESTOS COM-
POUND ESPECIALLY APPLICABLE FOR USE AS BOARDS OR SHEATHING FOR ROOFINGS,
WEARING SURFACES OF CAR BRAKES AND FOR BUILDING PURPOSES "which invention
has been communicated to me from abroad by Daniel Austin Brown of Boston,
State of Massachusetts and Charles Francis Brigham of Worcester, State of
Massachusetts, United States of America and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
This invention has for its object the production of an improved asbestos compound
which is adapted to be molded or formed into desired shape as now commonly
practised with paper and other pulp, the said compound being made as will be
described fire and water proof, and quite hard to take the place of wood or iron in
the arts.
In the manufacture of my improved compound, I take asbestos preferably in
fibrous form and either with or without other fibre of a vegetable or mineral
nature as an extender for cheapness, and with the same I incorporate oxide of
magnesium, and thereafter apply chloride of magnesium or any well known
equivalent therefor to temper and bring the same into plastic state, the compound
so produced being molded or formed into the desired shape as paper or other pulp
is molded or shaped. I have herein shown the improved compound adapted for
use as boards or sheathing for roofing, for cars and building purposes, or for
purposes to which wood is adapted, and it is obvious that many different articles
which it is desired should be fire and water proof may be produced from it by the .
employment of molds of suitable shape.

page_text: In the manufacture of my improved compound for the best results as a fire proof
material, I prefer to mix about equal parts by weight of asbestos and oxide of
magnesium, and then add a suflicient quantity of chloride of magnesium or other
well known equivalent material to render the same sufficiently plastic to be molded
or shaped by pressure into the desired form.
To cheapen this product and at the same time make it lighter in weight, I may
add to the asbestos, as an extender, about an equal portion in bulk of paper pulp,
and to render this latter better adapted in the compound to resist fire and water
I add to it before incorporating it with the asbestos, any usual materials which are
employed to render paper fire proof, as for instance potash, alum, etc."
The paper pulp treated to render it fire proof will preferably be mixed dry with
the asbestos and oxide of magnesium, and all be thereafter tempered or rendered
plastic.
I do not desire to limit my invention to the exact proportion of asbestos and
magnesium, or of paper pulp, as the same may be changed and produce articles of
undoubted value as to durability and fire and water resisting qualities.
The compound herein described is useful for a variety of purposes when a
medium is desired to resist wear as for instance for brake shoes, for railway cars
brakes the said material being applied to a skeliton frame of metal, shaped
substantially like the brake-shoe.
The metal frame will be placed in a suitable mold and the described compound
in plastic condition will be run into the said mold and be compressed and shaped
about the said metal frame.
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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:
A compound such as herein described composed essentially of asbestos and oxide
of magnesium incorporated and tempered or made plastic to be molded, substantially
as described.