How long can glass keep in natural state

2021-02-25 11:12:31

Glass is a common object in our daily life. It is mainly composed of quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda and other inorganic minerals and some additives. It is a kind of amorphous solid with irregular structure. The various shapes of glass we see are formed by pressing process. Most substances in nature will slowly erode in the long river of time. Have you ever thought about how long glass will be degraded in the natural state? There was a rumor on the Internet that it took 200 years for glass to degrade. Is that true?

The glass products found in Egypt can be traced back to the 13th century BC, and the older glass may have been made in Mesopotamia. These findings show that even if the glass bottle is broken, the glass composition can remain stable for thousands of years. Therefore, it is generally believed that glass is a very stable material and will not corrode, but this is not absolutely correct. Glass will be corroded by weathering, but very slowly. The chemical substance causing corrosion to glass is water which we think is harmless. Water can leach alkaline metal ions (sodium and potassium) from glass. The existence of acid gas may strengthen the ion exchange and cause micro damage to glass.

The chemical composition of the glass is very stable, and it will not be aged by wind, rain and sunlight in the natural state, and ordinary acid and alkali will not damage the glass. Temperature is the only factor that affects the life of glass. The temperature below 300 has no effect on the glass life and chemical stability, but the temperature above 300 will change with the increase of temperature, and the physical and chemical properties of glass will change with the increase of temperature. Generally speaking, the glass begins to soften at about 600 . In terms of chemical properties, the increase of temperature will lead to crystallization in the glass, which makes the glass gradually change from transparent to fuzzy. Therefore, in the natural state, the glass is not affected by high temperature, so the glass can be stored permanently.

The appearance of buried glass will change, and the chemical reaction between the surrounding soil and glass will usually produce a rainbow surface. This increases its beauty, but does not weaken its durability. Glass can be brittle or strong, depending on its composition. Old glass is more fragile than modern glass, but this does not affect its decomposition rate in the environment. In landfills, glass does not degrade due to wind or erosion. At first, glass was a rare and precious commodity because it required a lot of fuel to melt ingredients, and it was labor-intensive production. Modern methods can produce glass containers and products on a large scale. Recycled glass fragments can be melted to make new containers or products, such as kitchen tiles, wall insulation and abrasives. Considering the long life of glass and the ease of recycling glass, recycling glass is meaningful.

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