Product Description High purity :SiO2> 99.99%. Operating Temperature: 1250℃; Soften Temperature: 1730℃ . Excellent visual and chemical performance:acid-resistance,alkali resistance,Good thermal stability Health care and environmental protection. No air bubble and no air line. Excellent electrical insulator. CE.RoHs SGS approved. Specification Range OD 100MM-800MM, wall thickness and length to fully meet customers requirement; Material: High purity quartz sand Application Bio-Industry, Chip Manufacturing, Nano-Carbon Materials , Screen Substrate, Optical Fiber, Space Aeronautical Equipment, High-Purity Metallurgical Chemical Equipment Components, etc.