Wallace-Shawbury curometer

Measurements were taken on two natural rubber compounds rubber A with a very short scorch time, and rubber B with a very long one. For both rubbers, experiments were conducted at 120 C, 140°C, 160°C, 180°C, and 200 C. A Monsanto rheometer and a Wallace-Shawbury curometer were used, as well as isothermal apparatuses (see Table 1.1). 

Various techniques have been developed in turn the Mooney viscometer, the Wallace-Shawbury curometer, the oscillating disc rheometer (ODR), and the moving disc rheometer (MDR), in addition to the calorimetry techniques. The isothermal calorimetry and its counterpart in scanning mode, the isothermal moving disc rheometer (MDR), and the improvement of this last technique with the rubber process analyzer run in scanning mode, are considered. 

Laboratory measur ent of curing characteristics have been somewhat revolutionized by the introduction of the cure meters. There were two types of cure meter the reciprocating paddle type as in the Wallace-Shawbury curometer, and the oscillating disc type such as the Monsanto rheometer. In the oscillating disc type (ODR) a biconical disc is embedded in the rubber in a closed cavity. The disc is oscillating through constant angular displacement, and the torque required monitored. 

Two types of curemeters are in common use the reciprocating paddle type, such as the Wallace-Shawbury curometer, and the osaUating disc type, such as the Monsanto rheometer. 

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