I’m sorry to put a negative spin on the “Making good molds” thread
[ http://www.ganoksin.com/orchid/archive/200507/msg00622.htm ], but
I’ve been making molds for over 30 years and have made thousands of
My intent is to save anyone some grief for trying a new product. I
made the mistake of ordering some “Choice” brand mold rubber from a
very “Grande” company that most of us deal with.
When it arrived, I was surprised that it was made in Mexico. Not that
this would make any difference, but my first thought was, I hope this
is quality stuff.
This is the worse rubber I have ever used. Not that the final molds
are that bad, but the molds are so sticky when they come out of the
vulcanizer, you have rubber sticking everywhere. I use the same tongs
to remove the mold frames from the vulcanizer as I do to take hot
flasks out of the oven. The rubber sticking to the tongs against the
flasks stink up the whole shop. My bench pin where I cut the molds is
This is not an issue of vulcanizer temperature. This is just bad
rubber. Has anyone else experienced this?