Solution for Addition Silicone Not Curing Due to Poisoning

The high-temperature resistance and low shrinkage of the addition silicone rubber cannot be replaced by the condensation silicone rubber. However, the addition silicone has the disadvantage that it is prone to platinum catalyst poisoning and does not cure. Is there any solution to this problem? Please see the sharing cases of different usage scenarios below.

From another article "Explanation of Platinum Catalyst Poisoning Phenomenon", we can clearly know that the non-curing is caused by the poisoning reaction of the platinum catalyst in contact with toxic substances, so the principle of the solution is to avoid contact with these toxic substances.

1. Silicone Mold Making

silicone mold

The common substances that use addition silicone to make silicone molds that cause poisoning and do not cure are clay, UV curable resin, etc. The non-curing caused by plasticine can be replaced by non-sulfur clay. For the problem that the photosensitive resin does not cure, we can use the conversion method to make the addition molding silicone mold. First, use the condensation silicone to make a silicone mold, and then cast the epoxy resin material, so that an epoxy resin material model that is the same as the original model is obtained. And finally use the addition silicone to make the silicone mold of the epoxy resin material model.

2. Potting of Electronic Components

spray primer

If you use addition silicone rubber to encapsulate electronic components, you can remove substances containing S, P, As and other compounds. If you can’t remove them, you can only use a primer. First spray a layer of primer on the surface of the electronic components. After the primer dries, pour the addition silicone for potting.


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