... Dioxide>99.95% Transmittance of visible light>90% Specification 1. OD:1.2mm-360mm2. thickness of wall:0.5mm-12mm3. type:transparent ... -shape,twin tube, special shape, etc.4. OEM allowed5. certificate :CE 6. application fields: heating element, drying equipment, cooking device, medical ... ,20ppm,15ppm,10ppm,5ppm U-shaped Semi-clear Quartz Tubes with CE