This is because different rubber products need different vulcanization speed and degree, and different proportions of accelerators are needed to achieve the best vulcanization effect.

For some rubber products that need rapid vulcanization, such as tires and hoses, more DM is usually used to speed up vulcanization. However, for some rubber products that need slow vulcanization, such as rubber shoes and rubber mats, accelerators are usually used less or even not, so as to avoid the degradation of rubber properties caused by excessive vulcanization.