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Devitrification

This is part two of a multi-part series on devitrification.  Click here to go to part one.

Things to know about devitrification:

1.  Unclean glass can contribute to the formation of devitrification, as can dusty conditions inside the kiln. 

2.  Almost anything in the kiln that burns off during firing, such as binders, glues, etc., can increase the likelihood of devitrification.  Adequate ventilation of the kiln during the burn-off phase (up to 1000F/540C) will help prevent this problem.

3.  Devitrification is much less likely to occur in glass that is moving, as in a pot melt or crucible pour. 

4.  Although devitrification can occur anywhere above about 1100F/600C, it is much more likely to occur when the temperature exceeds 1300F/700C.  The longer the glass spends at the higher temperature, the more likely it is to devitrify. 

Click here for more about devitrification.

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Copyright 2005 Brad Walker.  All rights reserved.

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