Technical Parameters：
Uniform Temperature Zone Size:Φ (100-450)mm×(100-600)mm
Working Temperature：2100℃
Working Vacuity: 1×10-3pa
Heater Form：tungsten wire net heater as main heating heater, upper and
bottom compensation heater as tungsten rod heater
（according to temperature zone size）
Charging and Discharging Method：automatically lifting at bottom
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