Tetrasodium pyrophosphate
Na4P2O7 ; Na4P2O7·10H2O
Product information
Tetrasodium pyrophosphate
Sodium diphosphate (also called sodium pyrophosphate) is a colorless sodium salt of diphosphoric acid. It belongs to the class of diphosphates, which are approved as food additives in the European Union under the collective number , with sodium diphosphate specifically designated as . The compound exists as a white, odorless solid and is sparingly soluble in water.
In the food industry, it serves as an emulsifier, stabilizer, acidity regulator, and leavening agent (e.g., in baking powder), as well as a so-called curing auxiliary to improve water retention in meat and sausage products. Outside of food production, sodium diphosphate is used in detergents and cleaning agents as a water softener due to its ability to form stable complexes. In biochemistry, diphosphates, like the closely related adenosine diphosphate, are fundamentally important for energy metabolism. Concerns regarding a potential contribution to osteoporosis or the triggering of ADHD due to high phosphate intake have not yet been conclusively proven scientifically.
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Molecular Formula : Na4P2O7 , Na4P2O7·10H2O
Molecular Weight: Anhydrous 265.90, Decahydrate 446.10
CAS: Anhydrous 7722-88-5 Decahydrate 13472-36-1
| Specification | GB 1886.339-2021 | FCC VII | ||
| Content | Anhydrous(Na4P2O7),w/% | 96.5-100.5 | 95.0-100.5 | |
| Decahydrate(Na4P2O7·10H2O),w/% ≥ | 98.0 | ———— | ||
| Insoluble Substances,w/% ≤ | 0.2 | 0.2 | ||
| pH value(10g/L Solution ) | 9.9-10.7 | ———— | ||
| Orthophosphate,mg/kg ≤ | Passes Test | ———— | ||
| Arsenic (As),mg/kg ≤ | 3.0 | 3.0 | ||
| Heavy metal (as Pb),mg/kg ≤ | 10 | ———— | ||
| Lead (Pb),mg/kg ≤ | 4.0 | 4.0 | ||
| Fluoride (as F),mg/kg ≤ | 50.0 | 50.0 | ||
| Loss on ignition,w/% | Anhydrous≤ | 0.5 | 0.5 | |
| Decahydrate | 38.0-42.0 | 38.0-42.0 | ||