1 part silicones are standalone products that cure with no additional support. This is through Room Temperature Vulcanisation (RTV), meaning the product will begin to harden when exposed to temperatures of around 20°C. These products benefit from ease of use, as they require no mixing.
However, when depth is an issue, a 2 part product can be used. These products cure with the help of a catalyst or curing agent, meaning the cure spreads evenly throughout the silicone resulting in an even cure. This is often referred to as encapsulating or potting.
The diagram to the right shows a potting application. If a one part product was used, a full cure would only happen at point A, with uncured silicone underneath. Using, and correctly mixing, a 2 part product avoids this issue and ensures a full, even cure.
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