Glass bottle products are eroded by water, acid, alkali, salt, gas and other chemical reagents during use, and the resistance of glass to these erosions is called chemical stability. The chemical stability of glassware products is mainly reflected in the erosion of water by water and the erosion of the atmosphere by glass.
In the production of domestic glass bottles, some small factories sometimes reduce the Na2O content in the chemical composition of the glass or reduce the SiO2 content in order to lower the melting temperature of the glass, so that the chemical stability of the glass is lowered. Glass bottleware products with poor chemical stability are stored in a humid environment for a long time, causing hairiness on the surface of the product and losing the gloss and transparency of the glass itself. This phenomenon is often referred to as “back to alkali” in the factory. The glass is resistant to water chemical stability.
This should be given enough attention. Do not excessively seek to reduce the melting temperature and increase the Na2O content. Some flux should be introduced appropriately, or the chemical composition should be adjusted to lower the melting temperature, otherwise it will bring serious quality problems to the product. Sometimes due to poor chemical stability, it seems to be "back to alkali" at the time, but after exporting to some countries with high air humidity, "returning alkali" will cause greater economic losses. Therefore, there is a sufficient understanding of the chemical stability of the glass in the production of glass.
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