How to Choose The Hardness of Silicone

- May 15, 2020-

When the hardness of the mold silicone is less than 10 degrees, the tear strength of the silicone is low, and the elongation is large, and the silicone products are easily deformed. When the hardness is higher than 50 degrees, the tear strength becomes poor, and the silicone products will become brittle and easily broken or broken. Generally, when the hardness of silica gel is 20-40, the tear strength and elongation are the status. In addition, the lower the viscosity (the better the fluidity), the more beneficial it is to evacuate the air bubbles, but at the same time, the tear strength will also deteriorate and the number of mold repetitions will decrease.


The 0 degree hardness mold silicone is an ultra-soft silicone. It is an additive colorless transparent liquid. It has excellent electrical properties and chemical stability. It is water-resistant, ozone-resistant, weather-resistant, non-corrosive, physiologically inert, ** * Tasteless, low linear shrinkage, easy to operate and so on. Mostly used for chest pads, shoulder pads, simulated human dolls, etc. The silicone products made are washable, no bubbles, and will not crack.

The 5 to 10 degree hardness silicone rubber is soft silicone, with low hardness, good fluidity, easy infusion and non-corrosiveness. It is very suitable for delicate and soft soap crafts. The soap mold is not oily, deformed, and the surface is smooth and bright.

10-25 degree hardness silicone is recommended for products with a size of 10-20 cm. It is suitable for product models with very fine patterns. It can be used for pouring mold operation. This mold opening method is easier to demold and will not damage the silicone mold. The product. It can be used for making candles, copying various handicraft models, etc., and can also be used for clothing sign embossing (plant glue), etc. Candle silicone can be used in two types: condensation type and addition molding. The crafted silicone candle can be quickly ignited and continue to burn normally until the candle is burned out, and no oil is emitted during the burning process.

It is recommended to use silicone rubber with a hardness of 25-30 degrees for products with a size of 30-50 cm. It is suitable for selecting the mold opening mode. Condensed silica gel can be used for the production of silica gel molds such as gypsum, cement, concrete, rapid prototyping, GRC European-style components, large cement components, marble-like, artificial stone, etc .; Add-on transparent silicone can be used for injection molding, diamond-like, jewelry model making Wait. RXD17 or RXD33 can be used for shoe mold making.

It is recommended to use the brush mode (slicing mode, three-dimensional mode, and plane mode) for 40--50 degree hardness silicone rubber, which is suitable for products with not very delicate patterns;

50 degrees-60 degrees is high-hardness silicone, high tear resistance, high temperature resistance, washable stone grinding, strong adhesion and good firmness, mostly fixed by precision parts or fixtures.

If the customer is a small product with a very fine pattern, use a slightly softer silicone; if you are making a larger product, use a 32-35A ° harder silicone.