A New or Improved Compound or Material applicable for Electrical or Heat Non-conducting or Insulating Purposes.
Year: 1897

page_text: Date of Application, 2nd Oct., 1897
Complete Specification Left, 1st July, 1898-Accepted, 13th Aug., 1898
A New or Improved Compound or Material applicable for Electrical
or Heat Non-conducting or Insulating Purposes.
We, HAWTHORN JOHN BROWN, of Riverside House, South Darenth, in the
County of Kent, Paper Maker, OTTO ROBERT HEINRICH SCHMIDT, of Welton House,
S, Park Road, Forest Hill, in the same County, Merchant, and ALEXANDER
MACKENZIE, of Beechholme, Juniper Green, in the County of Mid-Lothian,
Merchant, do hereby declare the nature of this invention to be as follows:-
The invention relates to a new or improved compound or material applicable
for electrical or heat non-conducting or insulating purposes.
Various materials have been employed for electrical insulating purposes such for
example as the covering of electrical leads or conductors but they are all more
or less expensive and in many instances imperfect.
One of the best insulating materials at present known is mica, but this in perfect
sheets is difficult and expensive to obtain.
In the production of sheet mica there is a large percentage of waste and this
waste has accumulated until vast quantities thereof exist and are regarded simply
as refuse and there are also large deposits of mica unsuitable for making into
sheets.
Another good insulating material is silk, and this fabric as waste either in the
form of rags or otherwise can be readily obtained in large quantities and inasmuch
as this material is almost useless for paper making or other purposes it possesses
little or no market value.
Now the primary object of the present invention is to utilise these waste
materials and sometimes to combine the same with a binding material and thereby
form a compound specially adapted for electrical or heat non-conducting or insulat-
ing purposes.
In carrying the invention into effect the mica and silk are first reduced to a
fine state of division by any suitable grinding or disintegrating machinery or they
may be otherwise suitably treated and these materials are then combined in suit-
able proportions, for example the proportions might be sixty parts of mica to
forty parts of silk, and to these materials is then added in the necessary proportion
any suitable binding or cementing material or materials and the entire mass is
then thoroughly mixed by the aid of any suitable mixing machine.
After the mixing has been completed the compound may be run into moulds
and cast to the form or thickness that it is required to take or the leads or con-
ductors or other articles to be coated may be passed through or dipped into a bath
thereof.
Or, if the material is desired to be completed in sheet form it may be made to
the required consistency and then cast or rolled to the required guage.
In some cases the silk may be substituted by other fibrous material.
The binding material may sometimes be dispensed with and the other ingredients
may be combined by a felting or paper making process.

page_text: Or two or more sheets of the mica and fibrous material may be cemented together
to form a sheet of insulating material.
The compound may be usefully employed as a heat non-conducting coating for
steam boilers or the like or for other similar purposes.
It will be understood that the proportions of the ingredients may be varied
according to circumstances and the nature of the article to be produced or insulated.
By the means herein before described an electrical or other insulating or non-
conducting material is obtained of most efficient character at a moderate cost.
Dated this 2nd day of October 1897.
WHITE & WOODINGTON,
27, Southampton Buildings, London, Agents.
A New or Improved Compound or Material applicable for Electrical
or Heat Non-conducting or Insulating Purposes.
We, HAWTHORN JOHN BROWN, of Riverside House, South Darenth, in the
County of Kent, Paper Maker, OTTO ROBERT HEINRICH SCHMIDT, of Welton House,
8, Park Road, Forest Hill, in the same County, Merchant, and ALEXANDER
MACKENZIE, of Beechholme, Juniper Green, in the County of Mid-Lothian,
Merchant, 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:-
The invention relates to a new or improved compound or material applicable
for electrical or heat non-conducting or insulating purposes.
Various materials have been employed for electrical insulating purposes such for
example as the covering of electrical leads or conductors but they are all more
or less expensive and in many instances imperfect.
One of the best insulating materials at present known is mica, but this in perfect
sheets is difficult and expensive to obtain.
In the production of sheet mica there is a large percentage of waste and this
waste has accumulated until vast quantities thereof exist and are regarded simply
as refuse, and there are also large deposits of mica unsuitable for making into
sheets.
Another good insulating material is silk, and this fabric as waste either in the
form of rags or otherwise can be readily obtained in large quantities and inasmuch
as this material is almost useless for paper making or other purposes it possesses
little market value.
Now the primary object of the present invention is to utilise these waste materials
and generally to combine the same with a binding material and thereby form a
compound specially adapted for electrical or heat non-conducting or insulating
purposes.
In carrying the invention into effect the mica and silk are first reduced to a
fine state of division by any suitable grinding or disintegrating machinery or they
may be otherwise suitably treated and these materials are then combined in suitable
proportions for example for some purposes the proportions might be sixty parts of mica
to forty parts of silk whilst for other purposes these proportions might be reversed
or otherwise modified and to these materials is then added in the neccessary pro-
portion any suitable binding or cementing material or materials and the entire
mass is then thoroughly mixed by the aid of any suitable mixing machine.
The cementing material may consist of any suitable gum insoluble in water and
such for example as rosin pitch or shellac.

page_text: After the mixing has been completed the compound may be run into moulds
and cast to the form or thickness that it is required to take or the leads or con-
ductors or other articles to be coated may be passed through or dipped into a bath
thereof.
Or if the material is desired to be completed in sheet form it may be made to
the required consistency and then cast or rolled to the required gauge.
In some cases the silk may be substituted or supplemented by other fibrous
material.
Sometimes the ingredients are combined by a felting or paper making process
as will be readily understood by a paper maker and in that case a suitable binding
material would be employed.
The compound may be usefully employed as a heat non-conducting coating for
steam boilers or the like or for other similar purposes.
It will be understood that the proportions of the ingredients may be varied
according to circumstances and the nature of the article to be produced or insulated.
By the means herein before described an electrical or other insulating or non-
conducting material is obtained of a most efficient character at a moderate cost.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is:-
An electrical or heat insulating or non-conducting material consisting of
powdered mica and powdered silk or other suitable fibrous material or combinations
thereof and a suitable cementing or binding material combined in suitable pro-
portions and made into sheets or other desired forms substantially as herein described
and for the purposes stated.