Liquid silicone hardness of soft hard, silicoen rubber hardness determine its USES, because for the first time with silicone user not sure really need what kind of hardness, so will lead to buy silicone rubber hardness is not suitable for, share the following two kinds of feasible solution to the silicone is too hard.
The first method: we can use silicone oil to reduce the hardness of silica gel. Generally, 1% of silicone oil is added, and the hardness of silicone rubber will be reduced by 0.9 ~ 1.1 degrees. Add 10% of the silicone oil and the silicone hardness will decrease by about 5 degrees. But in practice if add the silicone oil column will destroy the molecular weight of silicone rubber, tear resistance, tensile strength of the poor, which affects the service life of the silicone mold, silicone oil to add other ratio is too big can also cause silicon rubber mould is easy to deformation. So, we suggest that: not more than 5%, the proportion of the general silicone and silicone oil and add some heavy silicone oil as far as possible, if add more than 5% of the silicone oil, please first small trial to determine the make mould can be used.
The second method: adopting the high hardness of silicone rubber and low hardness mixed silicone, use this method if you bought two hardness of silicone rubber , such as 20 ℃ and 10 ℃ of silicon silicone blend to the hardness of the silicone around 15 ℃. This hybrid method should be noted that the condensation type cannot be mixed with the molding compound, otherwise it will cause the phenomenon of uncured.
