... lubricants and fat 2. Good chelating capacity 3. Soften hard water 4. detergent grade Sodium tripolyphosphate STPP ( SGS quality report ... Assay Na5P3O10 % ≥ 94P2 O 5 % ≥ 57Water Insoluble Matter % ≤ 0.1Iron(Fe) % ≤ 0.01PH value (1% water solution) 9.2-10.0 ... : Widely used as auxiliaries for synthetic detergent, soap synergist , water softener, Tanning agent , dyeing an assistant, the effective powder ...