... optical glass crucible which make out phosphor gas, electrical furnace core pipe, gas combustion radiation form, thermocouple-protection tube etc.3 ... :Normally used in high-pressure and high-frequency insulation pipe, waveguide tube etc.4.New Light Source Field:Quartz ... as the growth of germanium, the silicon crucible, boat furnace core pipe, Bell jar etc. Some Typical Characteristics of Quartz: Very ...