(1) Mooney viscosity

The Mooney viscometer is used to measure the viscosity of the rubber body. The principle is to fill the mold between the cavity and the rotor of the viscometer, close the mold, and preheat it at a certain temperature (100 ° C) (1 min). The torque value (Nm) measured by rotating the rotor for a certain period of time (4 min). The larger the value, the greater the viscosity of the compound, which is usually expressed by ML (1+4) 100 °C.

(2) Mooney scorch

This is an indicator indicating that the rubber is burnt in the crucible. It is usually measured at 120 ° C (with a vulcanization system compounding agent). From the lowest point, it rises by 5 Mooney values ​​(the root can also take other rising values) time. The longer this time, the less likely the rubber is to be scorched and the safer the processing.

(2) Mooney scorch

This is an indicator indicating that the rubber is burnt in the crucible. It is usually measured at 120 ° C (with a vulcanization system compounding agent). From the lowest point, it rises by 5 Mooney values ​​(the root can also take other rising values) time. The longer this time, the less likely the rubber is to be scorched and the safer the processing.

(3) Plasticity

There are several methods of measurement, commonly used are Vickers plastometers and fast plastometers. The Vickers plasticity is obtained by compressing an unvulcanized cylindrical rubber sample between two flat plates at a predetermined pressure. After a certain period of time at a certain temperature, the external force is released, and after a certain period of time is restored, the height is measured. Taking the unrecoverable twist as the numerator, the sum of the height of the original twist and the load compression is the ratio of the denominator. The larger the value, the larger the plasticity.

(3) Plasticity

There are several methods of measurement, commonly used are Vickers plastometers and fast plastometers. The Vickers plasticity is obtained by compressing an unvulcanized cylindrical rubber sample between two flat plates at a predetermined pressure. After a certain period of time at a certain temperature, the external force is released, and after a certain period of time is restored, the height is measured. Taking the unrecoverable twist as the numerator, the sum of the height of the original twist and the load compression is the ratio of the denominator. The larger the value, the larger the plasticity.

(4) Tensile strength

Take the specified dumbbell-shaped sample, usually stretched to break at a speed of 500 mm/min, and calculate the force per unit area in the original section when unstretched, expressed in MPa.

(5) elongation at break

Tensile strength The ratio of the length of the sample stretched (excluding the original length) to the original working length when stretched in %