THE VISCOSITY PARAMETER OF CHINESE EMPLASTRUM AND ITS TECHNICAL CONTROL

The ring and ball method of softening asphalts was suggested as the viscosity parameter for Chinese emplastrum. It was found that emplastrum had the optimal softening point of 46—55℃. Proper products could be obtained with the use of litharge and sesame oil in the proportion of 1:2, and heating of the mixture at 285—345℃ for 5 to 10 minutes.