[Jewelry making - Article 00861] - [Orchid] Making Bad molds

[Richard Olson]

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    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
    them. 

    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
    sticky too. 

    This is not an issue of vulcanizer temperature. This is just bad
    rubber. Has anyone else experienced this?

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