Nowadays, for the silicone rubber raw materials with specific hardness, the low hardness silicone rubber and high hardness silicone rubber are usually used for neutralization and mixing to produce the ideal hardness. For example, 50% of the silicone rubber raw material at 40 °However, in the process of modulating the hardness of silicone rubber raw materials, if the hardness difference between the two is too large, there will still be silicone rubber particles with high hardness in the rubber, resulting in uneven mixing. For example, such a phenomenon can occur when 30 degree silicone rubber is mixed with 70 degree silicone rubber. The reason is that low hardness silicone rubber and high hardness silicone rubber can not be fully cross-linked. One degree is too hard and the other degree is too high, just like water and stone can not be fully mixed together.