[Jewelry making - Article 00047] - Re: [Orchid] Castaldo pink rubber

[Peter W . Rowe]

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>        Hi, I would like to know about your experience with pink
>     castaldo rubber mold. I read Castaldo's instructions about
>     vulcanization and it is not clear. Does 7.5 min per layer at 310
>     degres is correct or there is a special way to use it to obtain
>     minimum srinkage.


    The main thing to know is that you MUST use the temps given for
    noshrink pink, if you are to get little or no shrinkage.  This
    rubber, unlike virtually all other mold rubbers, really does mean
    it's temperature range quite precisely. Normal vulcanized rubbers
    have a relatively generous lattitude in temp within which they''ll
    vulcanize reasonably the same as they did with slight other temps in
    that range.  the no shrink pink will show measureable differences in
    shrinkage with as little as a ten degree difference in temp. You
    need an accuratly controlled vulcanizer, which is capable of holding
    the right temp consistantly, and where both platens are pretty close
    to the same temp (A lot of vulcanizers put the control on only one
    platen, and the other is slaved to it, but can still vary quite a bit
    in temperature.)  And use a good thermometer to check the temp. 

    All in all, it's a LOT easier to use the silicones, either
    vulcanized or not. they can give you no shrinkage too, with a lot
    less pickiness. 

Peter Rowe 

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