toh, tempered is more likely to shatter if it breaks at all, while nontempered glass is much more likely to just crack. Cracked glass is much easier to deal with than glas that shatters when broken.
Special heat/temperature tolerant glass (borosilicate liek Pyrex, etc.) would be less likely to shatter with a sudden temp change but will be very expensive and often what is available in thicknesses greater 1/16th" is slightly off-color.
***************************** Waveform Technology UNIX Systems Administrator
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