The chemical difference between tin-cure (condensation cure) and platinum-cure (addition cure) silicone mold making rubbers lies mainly in the metal used to catalyze or cure the base rubber. The metal tin is used to catalyze or cure tin silicone, and platinum is used to cure platinum silicone rubber. Accordingly, tin-cure silicone rubbers are usually significantly less expensive than platinum-cure ones.
Considerations:
. Inhibition (due to impurities or contaminants)
. Shrinkage
. Library life
. Production life
source: https://www.smooth-on.com/support/faq/184/
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