The dehydroxylation time of quartz glass is influenced by several factors, including the preparation method, the size of the glass, and the atmosphere and temperature used during the dehydrogenation process. Under normal melting conditions, such as in an oxidizing or neutral atmosphere, materials like SiCl4 are commonly used. However, when quartz glass is produced using an oxyhydrogen flame, which involves high-temperature hydrolysis and vapor deposition, a significant amount of hydroxyl groups can remain within the material. This is especially true for larger pieces, where complete removal of hydroxyl groups is challenging. For example, synthetic or gas-refined quartz glass sheets with thicknesses between 0.5 to 1.0 mm typically achieve about 50% hydroxyl group desorption after 140 hours under vacuum or dry N2 at 1050°C. Beyond this point, further desorption becomes minimal. On the other hand, quartz glass melted in a hydrogen-rich reducing atmosphere—such as in a continuous furnace where H2 acts as a protective gas—can undergo more efficient dehydroxylation. This is because hydrogen helps stabilize and release hydroxyl groups that are in a metastable state, often due to oxygen defects in the glass structure. As a result, a 1 to 1.5 mm thick fused quartz tube can lose over 90% of its hydroxyl groups after just 2 hours under similar dehydrogenation conditions. In general, if quartz glass is synthesized or refined in a hydrogen-rich environment, the efficiency of dehydroxylation can be significantly improved when the same dehydrogenation conditions are applied. This makes hydrogen-rich atmospheres particularly useful for producing ultra-pure, low-hydroxyl-content quartz glass. Bedside Table,Abs Material Bedside Table,Movable Hospital Bedside Table,Bedside Trolley Table Changzhou Offistyle Furniture Co., Ltd. , https://www.offistylefurniture.com