This is clear fused quartz glass tube available as continuous machine drawn and automatic controlled tubing .This glass has the typical characteriastics of high purity , good spectral transmission, weellcontrolled dimension and 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 .This glass can be supplied in the range of 3-80mm outside diameter, 0.6-2.0mm wall thickness and 1200-1500mm length. Exhaust tube with good cpk are suiable for highspeed streamline production .And further processing of trim cutting , fire polishing , bending and pinchingcan be done according to the requirement of cusomers .Oh-content can be controlled within 20ppm/15ppm/10ppm/5ppm/2ppm according to the requirement of customers. Wood case