
BS:
3900 A7
The
low temperature Viscometer has been designed to facilitate
routine measurement of the viscosity of paints. Good correlation with
application methods (e.g. brushing) is ensured by the use of a high rate
of shear (10,000 sec-1).
The cone & plate principle is selected because this is one of the
most convenient ways of obtaining high rates of shear.
The
ranges of measurement of 0-2, 0-5 poises and 0-10 poises are chosen as
suitable for most normal paints. Alternative rates of shear or ranges
of measurement can be obtained by using cones of alternative size or angle.
Temperature
control is essential in measuring the viscosity of paint. This Viscometer
has built-in provision for holding the sample at the temperature regardless
of normal variations in the bulk sample or in room temperature. Heating
or cooling of the sample is by a Peltier effect semi-conductor device.
The sample reaches the control temperature in no more than 15 seconds.
"A sample a minute" is well within
the capacity of this Viscometer.
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The
high temperature Viscometer has been designed for the control
of the viscosity of resins, bitumens, hot melts and similar products,
during manufacture.
These
Viscometers enable a very small sample from the cooking vessel to be checked
for viscosity in less than a minute. The instrument is thermostatically
controlled over a wide range of temperatures, one of which is selected
so that the melt viscosity of the resin comes within the viscosity of
the instrument.
In
this way, thinning tests are eliminated and a quick and accurate determination
of resin viscosity is obtained.
Ease
of cleaning is ensured by virtue of the small sample required and the
ease of access which is possible with the simple geometry of the cone
and plate principle. A wipe with paper tissue and suitable solvent is
all that is normally required.

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