Methods are devised for calculating the change of inner temperature gradient in rubber goods during vulcanization whether the temperatures of conducting medium at the both two sides are same or not. During the vulcanization of complex rubber goods such as automobile tyres

the change of inner temperature gradient has been ever calculated by foreign rubber technologists. But for vulcanization of tyres on increasing temperature at steps i.e. the outside heating is changeable with time

such method of calculation is

up to present

not succeeded. We find that the results calculated by applying the heat-conducting equation for rubber

sheets with introduction of our concept of synthesized "equivalent" numbers for complex rubber goods and that measured directly are very approximate. 3 Charts are provided in order to simplyfy the calculation. Methods of calculation of vulcanizing effect and devising of vulcanizing conditions are suggested.