... heater 1.high effecient 2.Health care to human body 3.6000h service life milky infrared quartz tube heater SiO2>99.9% Detail ... in500nm is less than 10%.With more than 70% far infrared transmissionThe purity of SiO2>99.9%Keep under 900°C ... . 6000h service life, with SGS, RoHs approved8. Widely used in infrared heater, cooking, oven, stove, baker, painting dryer, drying apparatus, dyeing ...