Two vulcanization role: silicone rubber with the peroxide curing, peroxide decomposition caused polymer after reaction, low molecular compound formation (such as benzene and benzoic acid) in rubber, rubber mechanical properties influence. Moreover, silicone rubber in the first stage of heating after forming, the crosslinking density is not enough, to make it further curing reaction can increase the density of silicone rubber. The tensile strength, elasticity, hardness, degree of swelling, density, thermal stability is much better than a cure. If not, maybe two vulcanization, silica gel properties production is affected to a certain extent, not better performance products. A vulcanization parameters and two vulcanization parameters may be different, which is related to the actual operation! There are a variety of vulcanized silicone, high temperature and room temperature. According to the high temperature silicone rubber for example, we often say no before vulcanization is, the mix is the many additives such as curing agent, release agent and rubber together refining. A look from the appearance can be seen. Hand pulled off, no flexibility. If at a certain temperature to mixing good glue under certain temperature vulcanization molding can be products, as we usually saw the silica gel mobile phone sets, the poison is poison as long as manufacturers can provide food certification, is non-toxic in general