... 600mm10mmXD-QB300W-600W400-600mm13mm Physical Properties of electric quartz heater tube OpalescenceSiO2Heat ResistanceThe opaque quartz tube transmitting rate in500nm ... 900°C for 15 minutes, then put into20°C water 3 times, no crack. Opaque/Milky quartz glass ... service life, with SGS, RoHs approved8. Widely used in infrared heater, cooking, oven, stove, baker, painting dryer, drying apparatus, ...