High purity&heating-resistance OD range 1.2mm-360mm, Silicon Dioxide> ... wall:0.5mm-12mm3. type:transparent,translucent,milky-white,red,u-shape,twin tube, special shape, etc.4. OEM allowed5. certificate ... >90%,OH content less than 50ppm,20ppm,15ppm,10ppm,5ppm U-shaped Semi-clear Quartz Tubes with CE