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Causes of Devitrification
This
is part two of a multi-part tip on the causes of devitrification.
Click here to go to part one.
5. Higher temperatures are more likely
to devitrify. In general, glass can devitrify at or above
1300F/700C, but it is much more likely to occur at temperatures
above 1500F/815C.
6. Longer time spent at higher
temperatures is also more likely to lead to devitrification.
Minimize the soak time at your top temperature to help reduce the
risk of devitrification.
7. Devitrification is also less likely
to occur if you use faster firing rates above 1300F/700C, and cool
faster from your top rate to below 1300F. This minimizes the
time spent in the temperature range above 1300F where
devitrification occurs.
8. The edges of a piece of glass
(especially a large item like a bowl) are more likely to devitrify
if they're too close to the side elements of the kiln. This is
because the edges will remain hotter for longer than other sections
of the glass. This additional time means that devit is more
likely to
occur because the edges spend more time above 1300F/700C.
Coming soon -- more causes of
devitrification.
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Copyright 2006 Brad Walker.
All rights reserved.
Thanks to Graham Stone for some
of the items in this tip.
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