Sodium hexametaphosphate (SHMP) is a hexamer of composition (NaPO3)6. Sodium hexametaphosphate of commerce is typically a mixture of polymeric metaphosphates, of which the hexamer is one, and is usually the compound referred to by this name.
S 1978 (OTTO) Sodium hexametaphosphate, crystalline, +200 mesh, 96% Cas 68915-31-1 - used as a deflocculant to prepare suspensions of kaolinite and ceramic grade kaolin.