NSF Std. 60 Listed Polyphosphate Chemicals

Approximate % active as PO4
Approximate pH value (1% solution)

Name: Sodium acid pyrophosphate
Formula: Na2H2P2O7
% active: 86% (pH 4)

Name: Tetrasodium pyrophosphate
Formula: Na4P2O7
% active: 72% (pH 10.5)

Name: Tetrapotassium pyrophosphate
Formula: K4P2O7
% active: 58% (pH 10.5)

Name: Sodium tripolyphosphate
Formula: Na5P3O10
% active: 77% (pH 9.5)

Name: Potassium tripolyphosphate
Formula: K5P3O10
% active: 64% (pH 9.5)

Name: Sodium trimetaphosphate
Formula: (NaPO3)3
% active: 92% (pH 6)

Name: Sodium hexametaphosphate,
Long Chain, Glassy, Metaphosphate
Formula: (NaPO3)6-20, ave=13
% active: 90% (pH 6-7)