OD Range 1.5mm-160mm; Silicon Dioxide>99.95%; Excellent Visual and chemical performance; high thermo-stability; anticorrosive,Thansmittance of visible light>90%.Deh-rodyolization available upon customer request,OH content less than 20ppm,15ppm,10ppm,5ppm,or 2ppm.Our products are used in areas of semiconductor, lighting and electric heating industries.