uniform manner.
500°C - The maximum temperature that Borosilicate glass

should be subjected to and then only for short period of no

longer than a few minutes.
510°C - Temperature at which thermal stress can be

introduced to Borosilicate glassware.
565°C - Annealing [ə'ni:l] vt. 使退火，韌煉；鍛煉n. 退火；鍛煉，磨練temperature. When uniformly heated in controlled conditions, such as a

kiln or oven thermal stress’s can be removed.
820°C - Softening point at which Borosilicate may deform [di'fɔ:m] vt. 使變形；使成畸形vi. 變形；變畸形adj. 畸形的；丑陋的.
1252°C - Working point, the temperature that glassblowers need to attain in order to work Borosilicate glass.
Working Temperatures
Borosilicate glass retains its mechanical strength and will

deform only at temperatures which approach its strain point應變點(diǎn).

The practical upper limit for operating temperatures is much

lower   and is controlled by the temperature ditterentials  in