Why Is the Glass Moldy

        Moldy condition: the glass surface is not flat and under long-term dark conditions.



        Cause of moldiness: initially, water or moisture is adsorbed on the surface of the glass, and then water or moisture diffuses into the glass. The soluble silicate in the surface layer is hydrolyzed and destroyed. First, sodium silicate and potassium silicate are hydrolyzed and destroyed to form NaOH and silica. The silica gel formed by the separated silica forms a protective film on the glass surface to prevent further erosion. NaOH formed by hydrolysis reacts with carbon dioxide in the air to form sodium carbonate, which is collected on the glass surface to form the soluble salt in the surface facial mask. Because of its strong water absorption, it deliquesces and finally forms alkali droplets. When the temperature and humidity around it change, these alkali droplets also change. If these alkali droplets are in contact with the glass for a long time, part of the gel like silicon oxide film will be dissolved, causing serious local erosion on the glass surface and forming spots. At this time, sodium ions will migrate out of the glass body and react with the air to form white alkali rich particles, which can be observed by scanning electron microscope.

        Treatment method: Sprinkle mold proof powder on the glass surface.


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