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.
Specification
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.
The CPD 2000 is a cone & plate Viscometer designed
for the quick results process control and quality
required when monitoring production.
Its design has been based upon REL's experience of
building the Analogue Cone & Plate Viscometer which
was used as the original instrument for the BS3900
Standard.
It continues to have a rugged design needed in
manufacturing but with new features to meet ever
demanding controls on modern production standards.
Its use is found in the paint, varnish, inks,
resins, food, bitumen, oil, adhesives and
pharmaceutical industries.
Specification
Manufactured to BS 3900:
A7, ASTM D 4287, ISO 2884
This instrument, based upon REL's ICI Cone and Plate
technology is designed for use in process and
quality control applications.
Readings may be taken at variable shear rates using
multiple speeds at temperatures between 10 degrees
and 230 degrees Centrigrade.
Possible applications include: oils, paints,
varnishes, resins, bitumen, foods, inks, plastics
and pharmaceutical products.
Incorporating the latest REL digital display for
speed and accuracy this unit can be seen on the
specification page..(to go there click the link bar
opposite).
The Viscometer's software requires a 486 PC or
better with an operating system using Win 3.1, Win
95, Win 98, or Win NT.
Research Equipment can supply you with Standard Oils
for precise viscometer calibration. The following
standards are available:
3 Poise
7 Poise
10 Poise
25 Poise
40 poise
Other Ranges to order.
The oils come in convenient 60ml containers and the
technical data and life span are recorded on each
individual container. The oils are also available in
tubs of 5 x 60ml.
This instrument has been designed and developed to
measure with the minimum of error, the density of
those paints that tend to pick up significant
quantities of air during manufacture. The device
operates on the principle of compressing the paint
to such an extent that included air bubbles are
reduced to a negligible volume. It can be used with
materials containing up to 10% by volume of included
air and is capable of results reproducible to better
than ±0.5%.
The instrument consists of a hollow cylinder with a
plunger in one end and a pressure release cap at the
other. Pressure can be applied to the sample of
paint by advancing the plunger with the screw
provided. Excess paint is forced out of the pressure
release cap which is set at a value of 150 p.s.i.
The instrument is so made that when the plunger is
screwed home the volume of paint enclosed is that of
100 gms. of water at 16.7°C.
In order to use the cup, the pressure release cap is
removed and the plunger withdrawn to the full extent
in order to give the cup its maximum capacity for
filling. The cup is held vertically with the open
end at the top and the paint to be tested is poured
in until it is nearly full. The cup is then closed
by replacing the pressure release cap.
The paint is now compressed by advancing the
plunger. When the pressure in the cup reaches 150
p.s.i. paint is forced out between the cup and the
pressure release cap. When the plunger has been
advanced to its full extent the paint in the cup is
at a pressure of 150 p.s.i. and the volume is the
same as that of 100 gms. of water at 16.7°C. If the
temperature is other than 16.7°C there will be a
small error due to the thermal expansion of the cup,
which may be regarded as negligible if the
temperature is between 12°C and 20°C. The excess
paint is washed away from the top of the cup and the
whole instrument dried.
The weight of the paint remaining in the cup is
obtained by weighing the cup and its contents and
subtracting the tare weight of the cup.
