The use of high temperature resistant glass

① strictly clean the surface of the high temperature resistant glass. If the alkali metals such as sodium and potassium and their compounds are contaminated on the surface of the high temperature resistant glass, they will become crystal nucleus when they are used at high temperature, and crystallize rapidly, resulting in loss of permeability. Therefore, the high temperature resistant glass must be immersed in 5-20% hydrofluoric acid for 5-10min before use, and then fully washed with deionized water. Finally, wipe, dry and dry the furnace tube with degreased gauze. It is forbidden to touch it directly by hand.

② high temperature pretreatment must be carried out when a new diffusion furnace fire is used to replace a new furnace.

③Please pay special attention to 573 ℃, which is the crystal transition point of high temperature resistant glass. Whether it's heating up or cooling down, it must pass through this temperature point quickly.

④ try to avoid unnecessary quenching and heating. Although the high-temperature resistant glass has good heat stability, but the opaque high-temperature resistant glass or the transparent high-temperature resistant glass with thickness greater than 5mm is easy to produce cracks when the temperature changes too much.

⑤ when installing the glass, the gasket shall be well padded. When tightening the screw, the force shall not be too large to prevent the glass from being crushed.

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