Sodium meta hexaphosphate, also known as sodium polyphosphate or Graham's salt, is a white, crystalline substance that is commonly used in industrial applications, such as water treatment and detergents. It is formed by the condensation of multiple molecules of sodium phosphate.

Sodium meta hexaphosphate is a highly effective sequestrant, meaning it can bind with metal ions to prevent them from reacting with other substances. This makes it useful in a variety of industrial applications where heavy metals and other contaminants need to be removed from water or other solutions.

It is also used as a builder in detergents, where it helps to soften water and improve the cleaning performance of the detergent. Sodium meta hexaphosphate can also be used as a dispersant, helping to keep ingredients in suspension and preventing clumping.