Pure salt itself has no shelf life, but edible salt with special nutrition has shelf life, and the shelf life is different. The shelf life of iron-containing salt is mostly 1 year, the shelf life of common iodized salt is about 2 years, the shelf life of refined iodized salt is 5 years, the shelf life of low sodium salt is 3 years, and the shelf life of selenium salt, calcium salt and zinc salt is 8 years.

The state stipulates that salt can be free of shelf life, but it does not mean that there is no shelf life, but the shelf life is long. In order to ensure the taste of salt without shelf life, it is best to eat it within 1 year. It should be noted that we must attach great importance to the storage environment of edible salt. The shelf life of edible salt will be shortened if it is stored in sunny or humid places.

The use of salt

1, edible salt

Used to flavor food. It is mainly composed of sodium chloride, which is salty, refreshing and adding flavor to food. Edible salt is divided into many qualities according to different production and processing, among which refined salt and sea salt are the most common. Refined salt is a refined white granular salt. Pure taste and wide use.

2. Industrial salt

It is a kind of salt used in industrial production, which is mainly used as snow melting agent, refrigerant, steam boiler scale prevention, chemical raw materials and so on. Industrial salt is usually not suitable for direct consumption because of its low purity and may contain impurities or chemical additives. The processing technology of industrial salt is different from edible salt, mainly to meet the needs of industrial production.

3. Medical salt

This is a specially treated and tested salt. In the field of medicine, medical salt is mainly used to make saline bath, physiological saline, foot bath salt and so on. The purity and quality of medical salt should be strictly tested to ensure compliance with medical standards and requirements.