[Jewelry making - Article 00033] - Re: [Orchid] Castaldo pink rubber

[Michael Knight]

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Dear Guy,

    	This is Michael Knight at CASTALDO. 

    	If you look at the instructions again you will notice that the
    temperature recommendation of 310 degree F  is suggested as a
    STARTING POINT for developing your technique. 

    	No Shrink Pink is extremely sensitive to temperature variations and
    requires fairly precise temperature control. Most vulcanizers are of
    very poor quality in this regard. I've seen brand new machines  with
    differences of 10, 20, 40 and, in one case, 90 degrees between the
    top and bottom plates. And forget about the dial setting -- it's a
    fantasy! 

    	The above is the reason our instructions cannot say:  do this and
    you will get zero shrinkage. It's impossible for us to write
    instructions that take into account the eccentricities of your
    particular vulcanizer. 

    	But 1,000's of mold makers have learned to use the product -- it
    takes a while but it's worth it. 

    	The procedures is outlined in the instructions:  calibrate your
    vulcanizer as recommended. Then make a mold, measure shrinkage,
    increase temperature a few degrees, make another mold and so on until
    you get the results you want. Then do that every time. 

    	Please note that wax injections will shrink a a great deal in the
    first 5 minutes, more in the next 5 minutes, and so on at a declining
    rate for DAYS. So make a strict practice of measuring shrinkage under
    the same conditions and at the same post-injection point. That is, if
    you measure your wax 10 minutes after injection, do that  exactly for
    the rest of your experiments. If you measure one after 5 minutes and
    the next one, because the telephone rang or something, after an hour,
    you have measured nothing useful. 

    	You can all me at 508 520 1666 if you want to discuss this further. 

    		Michael Knight  

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