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Viscometer is a shearing disk viscometer,
designed for accurate measurement of viscocity,
scorch time and cure rates of the elastomers.
instrument consists of flat, cylindrical disk,
driven by a motor to rotate slowly and
continuously in one direction. This disk is
embedded into elastomer specimen which is
confiend in a heated die cavity maintained at
specified temprature and kept closed by a
specified force. As the disk rotates its
experiences a shear strain. This resistance to
rotates offered by the elastomer is shearing
viscosity which is proportional to mean
absolute viscosity of the specimen.
preheat period is given to the elastomer
following which the disk starts to rotate. A
initial high viscosity is recorded and then as
the viscosity also decreases, to a minimum
value Viscosity obtained with large rotor are
approximately twice those of small rotor.
is reported as under:
1. Method of
2. Mooney viscosity number
3. Rotor size
4. Preheat time
5. Time interval to viscosity reading
6. Tamperature of test
results are started as under
Viscocity in mooney units.
L = Large rotor (for small replace it with ‘S’).
I = Preheat time in minutes.
4 = Time in minute after starting the motor at
which the reading is taken
100 C = Test temprature