What is Final Mooney Viscosity？
The final mooney viscosity is measured with a Mooney viscometer, which is a standard rotor rotating at a constant rotational speed (typically 2 rpm) in a sample in a closed chamber. The shear resistance received by the rotor rotation is related to the viscosity change of the sample during the vulcanization process, which can be displayed on the dial in Mooney through the force measuring device, and the Mooney vulcanization can be obtained by reading the value at the same time interval Curve, when the Mooney number first falls and then rises, the time when the Mooney number rises 5 units from the lowest point is called the Mooney scorch time, and the time when the Mooney scorch point rises by 30 units is called the Mooney vulcanization time.
The final mooney viscosity reflects the processing properties of the rubber, the molecular weight and the wide distribution range. The final mooney viscosity is high, the rubber compound is not easy to be mixed evenly and extruded, and its molecular weight is high and the distribution range is wide. The final mooney viscosity is low, the rubber material is easy to stick to the roller, and its molecular weight is low and the distribution range is narrow. If the final mooney viscosity is too low, the tensile strength of the vulcanized product will be low. The final mooney viscosity-time curve can also show the vulcanization process performance of the compound.
Final mooney viscosity is a value measured with a Mooney viscometer, which basically reflects the degree of polymerization and molecular weight of synthetic rubber.