... quartz tube,ozone free quartz tube,no ozone quart,low OH quartz glass tube,dehydroxyl tube, ozone free quartz tube,short ... high purity, good spectral transmission, well controlled dimension and low OH, etc. They’re the best heat resisting material for lamps ... according to customers’ requirements. We also can control our tubes OH content within 20ppm\ 15ppm\10ppm\5ppm\2ppm as your special ...