... Physical Properties of electric quartz heater tube OpalescenceSiO2Heat ResistanceThe opaque quartz tube transmitting rate in500nm is less ... point1600°CAnnealing point1050°C Opaque/Milky quartz tube dimension toleranceDimensionODWallLength5-8±0.20±0.10± ... infrared heater, cooking, oven, stove, baker, painting dryer, drying apparatus, dyeing, print, printer, copy machine, projector, sterilizing ...