Improvements in Non-conducting Compositions for Coating Boilers, and for like uses.
Year: 1894

page_text: Date of Application, 12th Dec., 1894
Complete Specification Left, 2nd Feb., 1895-Accepted, 9th Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in Non-conducting Compositions for Coating Boilers,
and for like uses.
I, JOSEPH ALFRED FISHER, General Manager of the United Asbestos
Company, Limited, of Dock House, Billiter Street, in the City of London, do
hereby declare the nature of this invention to be as follows:-
In order to prevent loss of heat from the exterior of boilers, from flues and from
other heated surfaces, it is customary to coat them with adherent and cohesive
nonconducting plaster consisting for the most part of mineral matter.
I have found that very suitable and efficient compositions for such use may be
made, in which the chief ingredient is a certain waste material, viz. the lime
residue from the process known as Dr. Clarke's whereby hard water is softened
and made more suitable for domestic use.
This form of carbonate of lime is much lighter and more porous than the
ordinary forms of the mineral, hence it makes a better and more suitable
nonconducting coating and being a by-product it can be obtained at a comparatively
low price. The lime waste requires to be mixed with an adhesive binding material
and with a mineral fibre to give to the composition the requisite coherence and
toughness.
Compositions which I employ are the following :-

page_text: Improvements in Non-conducting Compositions for Coating Boilers,
and for like uses.
I, JOSEPH ALFRED FISHER, General Manager of the United Asbestos
Company, Limited, of Dock House, Billiter Street, in the City of London, 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 :-
In order to prevent loss of heat from the exterior of boilers, from flues and from
other heated surfaces, it is customary to coat them with adherent and cohesive
nonconducting plaster consisting for the most part of mineral matter.
I have found that very suitable and efficient compositions for such use may be
made, in which the chief ingredient is a certain waste material, viz. the lime
residue from the process known as Dr. Clarke's whereby hard water is softened
and made more suitable for domestic use.
This form of carbonate of lime is much lighter and more porous than the
ordinary forms of the mineral, hence it makes a better and more suitable non-
conducting coating and being a by-product it can be obtained at a comparatively
low price. The lime waste requires to be mixed with an adhesive binding material
and with a mineral fibre to give to the composition the requisite coherence and
toughness.
Compositions which I employ are the following
:-
Precipitated lime waste produced in Dr. Clarke's water
softening process (say)
65 parts
The asbestos fibre should be well opened out and the other materials should be
finely ground. The mixture of the ingredients should be very intimate and
complete.
When required for use the non-conducting composition should be mixed with
water to the consistence of mortar and plastered upon the surface to be coated.
Several successive coatings should be applied until the desired thickness is attained,
each succeeding coating being laid when the under coating is partially dry.
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 :-
Non-conducting compositions containing as the chief ingredient the precipitated

page_text: lime waste produced in Dr. Clarke's water softening process and also containing
an adhesive binding material such as flour and a mineral fibre such as asbestos to
impart coherence and toughness.
Dated this 30th day of January 1895.
JOSEPH ALFRED FISHER.