15 Feb 2012, 13:09
Hardness is relative and very hard to check in glass. Unless you have worked with tempered and untempered items of the same material, and gone back and forth, it is easy to miss how different the work is. The same piece of glass if tempered will almost explode upon having it's surface broke, if lightly annealled(softened by heating to 700-900f. ,sorry, no metric/English converter here anymore) it can be cut,scored and ground if not treated too roughly, annealed twice like "double strength" window glass it becomes easy to cut,score and snap,etc. Most household ovens that have a cleaning cycle get just barely hot enough to anneal glass a little. Can make the difference between success and failure. But there are good, small tabletop units for doing it right.
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