How To Choose the Right Silicone Hardness to Make a Mold

The diversification of the hardness of the mold silicone raw materials has made many users at a loss. They don't know which silicone hardness to choose. To help you choose the hardness of the silicone, we will answer your questions through the analysis of the hardness of the silicone.

silicone hardness test

At present, the hardness unit of silicone rubber on the market is generally shore A, and the common hardness ranges from 0 to 70 shore A. Basically 5 shore A hardness a model, hardness error range in ± 2 shore A. In principle, the choice of hardness is that the size of the model is directly proportional to the hardness of the silica gel, that is, the large-size model uses high hardness, and the small-size model uses low hardness.

For the production of food silicone molds, such as chocolate, candy, etc., it is recommended to use platinum-cured silicone 5-15shore A, because low-hardness silicone can release better. For the production of precision casting silicone molds, it is recommended to choose 30-40 shore A platinum-cured silicone, because platinum cured silicone has advantages over tin-cured silicone in terms of temperature resistance and shrinkage.

0 shore A: This kind of silicone is very soft and has good elasticity, this kind of silicone has poor tear resistance and is mostly used for the production of simulated human body.

5-10 shore A: It is suitable for model making with fine surface texture or small size models, such as soap, candles, etc.

15-30 shore A: 20-30 hardness silicone performance is the best, higher or lower than this hardness range of silicone in the tear resistance performance is gradually weakened, this hardness range is mostly used for industrial products silicone mold production. Such as resin crafts, car tire molds, plaster products, sculptures, cultural stones, concrete and other mold making.

35-40 shore A: Suitable for jewelry, high-precision models, epoxy resin, etc.

45-70 shore A: This kind of high hardness silicone is very poor in toughness, not suitable for making silicone molds, suitable for filling.


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