Q & A: Soft Tin Cured Liquid Silicone Rubber for Mold Making (5 comments)

I was using this rtv-2 silicone product and when I mixed part A and part B together I was getting air bubbles when stirring. is this normal? Will it affect the mold quality?

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Yes, RTV-2 liquid silicone will produce some bubbles when stirring, it is recommended that you use a vacuum pump to defoam is the best solution. If there are air bubbles in the mold, it will indeed cause a shorter service life.

Is the mold made of this product soft or hard?

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Soft or hard depends on the hardness chosen, but no matter how hard it is, it is an elastomeric material.

I created a sculpture using plasticine... is it possible to make the mold with this liquid silicone material?

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Yes, it is recommended to spray a release agent on the plasticine sculpture model to prevent damage to the soft plasticine model during demoulding.

I get a lot of microbubbles as soon as I start mixing, any tips to reduce the bubbles?

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Yes, tin cure liquid silicone is a viscous liquid that will produce air bubbles when mixed and stirred. We recommend using a vacuum pump to defoam is the best solution. If you don't have a vacuum pump, it is recommended to choose an addition cure silicone with a lower hardness or use a brush-on process to reduce air bubbles.

I have a delicate piece with some undercuts that I need to cast in resin. I'm concerned about the hardness of the resin once it cures, as I need a mold that is soft and stretchy enough to accommodate the piece. Can you tell me how soft this liquid silicone will be when it cures?

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Silicone has good mold release properties, you can choose low hardness silicone with 5-15 shore A. It is recommended that you spray the release agent for better effect.