1. Accelerators are divided into three categories according to acid and alkali. One is the acid accelerator (represented by the letter A) : including thiazoles, thiuram, dithiocarbamates, xanthates; The second is alkaline accelerators (represented by the letter B) : including guanides and aldehydes; The third is neutral accelerators (represented by the letter N) : including secondary sulfonamides and thioureas. The accelerators are classified as AB, AA, BB, NA, NB, NN, etc., according to the combination of acid and alkali, but the common use is the combination of acid and base (AB), acid and acid (AA), and medium acid (NA).
2. Accelerators are divided into five categories according to the vulcanization rate. In the world, it is customary to compare the vulcanization rate of accelerator M to the use effect of accelerator M on natural rubber. Slow grade: aldehydes, thioureas; Medium speed grade: guanidine; Quasi superspeed class: thiazole, subflavamides; Overspeed class: Thiuram; Super speed class: dithiocarbamates, xanthates.