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This is the temperature above which the glass will begin to soften or [[slump]]. The absolute temperature is different for different types of [[glass]]

...[[glass]] piece to not crack, but so so high as to cause it to deform or [[slump]].

...n the glass while it was being worked. But not so hot that the glass can [[slump]] (which would occur above the [[softening point]]) and thereby ruin or dis