we supply different sizes of clear or milky quartz tube for lamps, heater, semiconductor, thermouples and etc. industries in china for more than 10 years. and we also manufacture the quartz tube according to customers requires. doped with trace elements,the red quartz tube,dark red and pink red available,is able to prevent all the uv rays and part of visible lights and meanwhile make the most of infrared rays. it is widely used in the field of far infrared heating , such as heater ,sterilization tank, microwave oven, electric cooker, electric oven, surface drying, automobile paint baking ,etc. lianyungang granhtquartz factory