18 months.

Iodine will evaporate slowly and salt will clump, but it will not affect consumption. Whether it is pure salt or iodized salt, it does not affect consumption no matter how long it is left. Iodized salt has a shelf life, mainly because the iodine component in it is easily oxidized and decomposed. After the shelf life of 18 months, the iodine component is very low. , cannot play the role of iodine supplement.

The main component of table salt is sodium chloride, which is the main source of salty taste. In the past, table salt was mainly salt. This kind of table salt only contains simple sodium chloride. This chemical substance It is very stable, so it has no shelf life, and the salty taste will not change even if it is left wet for a long time. In recent years, in order to supplement iodine, the state has stipulated that iodine should be added to table salt. This kind of salt has a shelf life.

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Extended information:

Salt The main ingredient is sodium chloride, which is the main source of salty taste. The chemical properties of sodium chloride are very stable, so no matter how long it is stored, the salty taste will not change. But being salty does not mean that it has not deteriorated, because in addition to sodium chloride, potassium iodide is also added to table salt;

Although the properties of potassium iodide are relatively stable, the potassium iodide will deteriorate under long-term exposure to light, wind and heat. Iodine element will also reduce the iodine content in table salt due to volatilization, affecting the effect of iodine supplementation. Therefore, table salt has a shelf life.

/www.gd.xinhuanet.com/newscenter/2018-11/26/c_1123768001.htm"target="_blank"title="Xinhuanet-Salt has no shelf life? Do you know these "salt misunderstandings"? ">Xinhuanet-Salt has no shelf life? Do you know these "salt misunderstandings"?