What is the shelf-life for salt?

In its dry crystalline form, salt is chemically stable. It does not degrade or become stale. However, the free-flowing, usable life can be limited by caking or lumping of salt crystals due to moisture. Proper storage conditions, including minimal cycling through 75% relative humidity are helpful in prolonging the useful life of salt. For more information, refer to the product data sheet for the product you are purchasing.