ENSACO® Conductive Carbon Black for polymer ... - Timcal Graphite

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Rubber
Carbon black is one of the main ingredients
of any rubber compound. Conductive carbon
blacks are before all carbon blacks, to be mixed
and handled as any other reinforcing or semireinforcing
carbon black. They are high structure
materials bulky by nature. Although the
common carbon blacks are conductive by
nature and impart also conductivity to the
compounds when used in sufficiently high
loading, conductive carbon blacks have the
advantage to reach conductivities at lower loading
and are often used to give the final boost to
a compound already filled with other carbon
blacks. As carbon black structure is the parameter
determining the conductivity, structure
being an additive property, the combinations of
conductive and normal black can be predicted.
Specifications of rubber compounds being
usually quite complex and conductivity being
only one of the numerous physical requirements,
the use of carbon black blends is very
often the only solution.
In some specific cases, especially in special
polymers, it occurs that the conductive carbon
black is used by its own in order to maintain
mechanical properties and processing at a good
level.
ENSACO ® carbon blacks are, as mentioned
above, quite close to furnace blacks as far as the
reinforcing activity is concerned. Especially the
low surface area carbon blacks, grades 150, 250
and 260, are, due to their very easy dispersion,
quite performing in most rubber compounds.
ENSACO ® 350 is also used in some compounds
where small additions are required.
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Typical applications for ENSACO ® Conductive Carbon Black
A few conductive
applications:
belt cover compounds;
flooring;
conveyer belts;
hoses for fuel, for conveying
of powders, etc.;
cylinder coating;
shoe soles;
seals.
ENSACO ® 150 and 250 are also used in non
conducting applications where the compounder
can take profit of the low surface area and high
structure of those blacks:
low hysteresis with relatively high hardness;
good thermal aging;
very good tear strength;
very good dispersion, very good mechanical
performance at thin layer.
A few non-conductive
applications:
antivibration systems;
textile coating;
membranes;
articles exposed to chipping and chunking.
In the following pages there are some of the
results of experimental work carried out on
ENSACO ® Conductive Carbon Blacks in different
rubber compounds.
The data shown here are given as orientation
and are valid for the particular formulations
and sample preparation technique
mentioned. Results in other polymers, full
studies and publications are available upon
request.