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RTV vs Belicone Blue

What is the difference something called “RTV molds” and other
zero-shrinkage mold rubbers like “Zero” and the Belicone blue
silicone rubber?

Jonathan Silo

Dear Jonathan,

The initials “RTV” stand for"Room Temperature Vulcanizing". That’s
as opposed to vulcanization through heat and pressure.

The rubber compounds you mention are all RTV’s – different brands
and types.

Please be advised that "zero-shrinkage " mold materials will will
result only in zero-shrinkage molds,not in zero shrinkage castings.
There are just too many other factors involved, all introduced by
the user.

Michael Knight
Castaldo Products Mfg. Corp