With the increase of room temperature vulcanizate and the emergence of high temperature vulcanization, the vulcanization temperature tends to two extremes. From the viewpoint of improving the curing efficiency, it should be considered that the higher the curing temperature, the better, but in reality, the curing temperature cannot be increased infinitely. Rubber is a high-molecular polymer. High temperature will cause a cracking reaction of the rubber molecular chain, which will cause the cross-linking bond to break, that is, the phenomenon of "vulcanization back to original" will occur, thereby reducing the physical and mechanical properties of the vulcanizate. For example, when vulcanizing natural rubber at high temperatures, the oxygen dissolved in the rubber increases in activity with increasing temperature, causing strong oxidation, damaging the rubber structure, and reducing the physical and mechanical properties of the vulcanizate.
     
Considering the heat resistance and "vulcanization back" phenomenon of each rubber, the recommended vulcanization temperature of each rubber is as follows:

NR is best at 140-150 ℃, the highest is not more than 160 ℃;
Butadiene rubber, isoprene rubber and neoprene rubber are best at 150-160 ℃, and the highest is not more than 170 ℃
Styrene butadiene rubber and nitrile rubber can be used above 150 ℃, but the highest does not exceed 190 ℃;
Butyl rubber and EPDM rubber are generally selected from 160-180 ℃, and the maximum is not more than 200 ℃;
Silicone rubber and fluorine rubber generally adopt two-stage vulcanization, the temperature of one stage can be selected from 170-180 ℃, and the temperature of two-stage vulcanization can be selected from 200-230 ℃.

According to process requirements, it can be selected in the range of 4-24h.