... %2. Far infrared heating transmission, in medium wave, wave length range of 2.2-3.5 micron3. Health care & environmental protection4 ... SGS, RoHs approved8. Widely used in infrared heater, cooking, oven, stove, baker, painting dryer, drying apparatus, dyeing, print, printer, copy machine ... heating element FYI clear quartz glass coil tube for oven/cooker resistant high temperature