Color:clear High-temp resistance Clear Quartz Tube/glass Tube: In addition, in accordance with the request of the customer to carry out neatly on the quartz tube cutting, burning mouth, bending, sealing, sanding and other deep-processing. Hydroxyl content can be controlled within 20ppm, 10ppm, 5ppm, 3ppm, 2ppm according to the requirement of customers. Clear Quartz