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Low hydroxide radical transparent quartz galss tube,which is produced through the advanced productive technique of continuous smeting method,it has the characteristics of high purity,strong transmission.good thermally stable function,clear surface,low contents of hydroxide radical,it is the first used materials of producing halogen lamp,mercury vapor lamp,metal halogen lamp.The contests of hydroxide radical can be controlled within 20ppm/10ppm/5ppm/2ppm according to the demands of users.Hydroxyl vitreous silica glass tube typical size and commondifference Outer diameter scope and common difference(±mm) Wall thickness and common difference(±mm)Leaning wall(%)Ellipse number of degree(%)Curving number of degree()Base content(ppm)Outer diametercommon differenceWall thicknesscommon difference≤60.05-0.10.5-0.11.05-0.1122.02.53—15100.05—0.10.8—1.50.05—0.1101.52.53—15200.1—0.21—20.1—0.15151.52.51—15300.15—0.31—30.2—0.3152.02.55—201450.2—0.31.5—2.50.2—0.3202.02.05—20