This is clear fused quartz glass tube available as continuous machine drawn and automatic controlled tubing. This glass has the typical characterias-tics of high purity, good spectral transmission, well controlled dimension and lower OH and so on. This glass can be supplied in the range of 2-1 60mm out side diameter,0.6- 5.0mm wall thickness and 500-3000mm length. Exhaust tubes with good CPK are suitable for high-speed streamline production. OH-content can be controlled within 20ppm/15ppm/5ppm/2ppm according to the requirement of customers. The detailed dimensional tolerance and technical data can be found in table I,tableII.