... -360mm2. thickness of wall:0.5mm-12mm3. type:transparent,translucent,milky-white,red,u-shape,twin tube, special shape, etc.4 ... . OEM allowed5. certificate :CE 6. application fields: heating element, drying equipment, cooking device, medical equipment ... than 50ppm,20ppm,15ppm,10ppm,5ppm U-shaped Semi-clear Quartz Tubes with CE