Heat resistance of quartz sight glass
Heat resistance: quartz sight glass as the quartz sight glass line coefficient is extremely small, it has a high thermal shock resistance, quartz sight glass in a furnace at 1100 DEG C for 15 minutes, then put into the cold water, can withstand 3-5 cycles without rupture; quartz sight glass at 800 DEG C for 5 minutes, put 20 C water that can withstand 5 cycles without rupture. The softening point of quartz sight glass is very high, and quartz sight glass is 1730 degrees. So the continuous use temperature of quartz instrument is 1100 -1200 C, and short time can be used at 1450 C.

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