Liquid silica gel in the fixed line after soft, but also hard, adding the proportion of curing agent is different, the hardness of silica gel is not the same.The hardness of silica gel determines its use. Because users who use silica gel for the first time are not sure what kind of hardness they need, the hardness of silica gel bought will not be suitable. The following two solutions to solve the problem of silica gel is too hard.

Method one: we can use silicone oil to reduce the hardness of silica gel, generally adding 1% silicone oil, the hardness of silica gel will reduce about 0.9 ~ 1.1 degrees;Add 10% silicone oil, silicone hardness will reduce about 5 degrees.However, in actual operation, if the ratio of silicone oil added is too high, the molecular weight of silica gel will be destroyed, the tear resistance and tensile strength will be correspondingly worse, thus affecting the service life of silica gel mold. In addition, the proportion of silicone oil added is too large, which will also lead to the deformation of silicone rubber mold.

Therefore, we suggest that the proportion of silica gel and silicone oil is not more than 5%, and try to add silicone oil with greater viscosity. If more than 5% silicone oil is added, please try a small amount to determine whether the mold made can be used.

Method two: the use of high hardness silica gel and low hardness silica gel mixture, the premise of using this method is that you buy two kinds of hardness of silica gel, such as 20 hardness of silica gel and 10 hardness of silica gel mixture after the hardness of 15 Shore A.The use of this mixing method should be noted that the condensation silica gel can not be mixed with the molding silica gel, otherwise it will cause the phenomenon of non-curing.

Liquid silica gel curing must have a certain hardness, if the product hardness is high, there is no way, can only be scrapped, but not used up liquid silica gel can be added to reduce the hardness of silicone oil, adding 1% silicone oil can reduce the hardness of one degree.

Do you think the above two methods to adjust the hardness of liquid silica gel are feasible?If you have a better way to communicate with us, ZINCA silicone will try to provide you with more liquid silicone problem solutions.