Polyphosphates and, in particular, sodium hexametaphosphate (SHMP),
are dispersing agents and can change the distribution of the ionic
charges (positive - negative) in soluble compounds. This stabilises
the emulsion, which becomes more fluid. This property is very useful
in the paint industry. Due to their chelating properties, phosphates
are also used in corrosion inhibition through the chelation of iron
ions.
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