[Some factors influencing the determination of the softening point of plaster].
A study has been carried out on the factors influencing the softening point of plaster, such as the de-coherence, the fusing time, the cooling time, the point of constant temperature and the rate of rise in temperature. It seems feasible to determine the softening point by a mixture of vaseline and beeswax as the de-coherence when the temperature is kept at 3 degrees C/min.