With the use fusion technology and effective automatic controlled system, this clear quartz tube has the typical characteristic of high purity, good spectral transmission, well controlled dimension, lower OH and so on. It serves as the first choice of heat resistant material for halogen lamps, mercury lamps, metal halide lamps and other quartz lamps. And further processing of trim cutting, fire polishing, bending and pinching and etc. can be done according to the requirement of customers. OH-content can be controlled within 20ppm15ppm10ppm5ppm2ppm according to the requirement of customers.