For liquid silicone rubber, its common hardness is 0 degrees to 70 degrees, solid silicone rubber is 30-80 degrees, and liquid silicone rubber below 0 degrees is also available, but it needs to be customized, which needs to be measured by Shao C hardness tester! Liquid silicone rubber can also produce 80 to 90 degree materials, but it will be brittle and not often used! When it is higher than 90, silicone rubber shall be measured with Shao D hardness tester! This kind of silicone rubber is very hard, but it has little elasticity!

Generally speaking: when the hardness of silicone rubber is lower than 10 ℃, the tear strength of silicone rubber is low, the elongation is large, and the silicone rubber products are easy to deform; When the hardness is higher than 40 degrees, the tear strength becomes worse, and the silicone rubber products will become brittle and easy to break or break. Generally, when the hardness of silicone rubber is 20-40 °, the tear strength and elongation are the best. In addition, the lower the viscosity (the better the fluidity) is, the better the vacuum exhaust bubble is, but at the same time, the tear strength will become worse and the number of re molding will be reduced.

Liquid silicone rubber is a food grade industrial product. It is generally used for the production of silicone rubber products such as milk bottles, pacifiers and dental gum. What is the minimum hardness? In the hardness of silicone rubber, silicone rubber less than 15 degrees is called soft glue with low hardness. This kind of silicone rubber is generally soft and easy to demould. Generally, the minimum hardness of formed silicone rubber can be 0 degrees, The minimum hardness of condensed silicone rubber is about 3 degrees.

In short, the liquid process is more often done at about 10 degrees to 20 degrees. For some silicone rubber miscellaneous products, the silicone rubber products made by the liquid process are not easy to disassemble by themselves. Due to the materials, this leads to a problem that the rough edges of the products are not smooth and the appearance has burrs. Therefore, the liquid process is suitable for low degree silicone rubber products without self disassembly, which is very strict.