How To Adjust The Hardness Of Silica Gel?

The first method: using relatively high hardness silica gel and lower hardness silica gel, the two are mixed according to a certain ratio; generally in the case of harder silica gel, such as 50 degrees (Shore hardness) hardness silica gel and 30 degrees After the hardness silica gel is mixed, the hardness of the silica gel is about 40 degrees.

The second method: we can generally use silicone oil to reduce the hardness of silica gel. However, in practical applications, if the silicone oil ratio is added to destroy the molecular weight, tear resistance and tensile strength of the silica gel, corresponding deterioration will occur, thereby affecting the service life of the silicone mold. In addition, an excessive proportion of silicone oil can also cause the silicone rubber mold to be easily deformed. Therefore, the ratio of silica gel to silicone oil is generally not more than 5%, and a silicone oil with a larger viscosity is added as much as possible. If the silicone oil content exceeds 5%, use a small amount to determine whether it can be used.

Finally, it is said that some relatively soft silicones are generally used to make soft silicone products, such as silicone kneading, silicone mask, silicone chest stickers / chest pads and so on.

Some people will ask, how much can the minimum range and the highest range of silicone hardness be achieved? The minimum hardness of silica gel can be about 5 degrees (usually liquid silicone), while the highest hardness of silicone products can be about 80 degrees (notable Such a high hardness silicone product will be very brittle!). Generally, when the hardness of the silica gel is 30 degrees, the fluidity, tear strength and elongation of the silica gel are the best degrees; when the hardness of the silica gel exceeds 40 degrees, the tear strength and elongation of the silica gel product are Straight down trend!