The 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.
Normally a 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.
The viscosity is reported as under
- Method of sample preparation
- Mooney viscosity number
- Rotor size
- Preheat time
- Time interval to viscosity reading
- Tamperature of test
= 50ML(I+4) 100C
Where
- 50M = 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
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Specification | |
Rishikesh-Viscosoftware |
