[Jewelry making - Article 00668] - Re: [Orchid] PMC firing times

[Lora Hart]

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    PMC Standard and Gold both shrink 30% since they are fired at the
    maximum times and temperatures for each medium. 

    PMC+ and 3 shrink 10-12% depending on the schedule you choose.  When
    fired at 1650 for two hours they reach maximum shrinkage of 12%, if
    you have rehydrated and added water to the clay, it may shrink a tiny
    bit more, but no where near 30% 

    The times and temps suggested by the manufacturer of Precious Metal
    Clay are as follows: 

    PMC Gold - 1830 for two hours
    PMC Standard - 1650 for two hours
    PMC+ - 1650 for 10 mins OR
                  1560 for 20 mins OR
                  1470 for 30 mins
    PMC3 - 1290 for 10 mins OR
                  1200 for 20 mins OR
                  1110 for 30 mins

    Art Clay Silver shrinks 8-10% and has a different firing schedule. 
    They never developed a material that shrinks 30%. 

HTH,
Lora Hart

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