Reported in EPA TSCA Inventory.

OSHA PEL: TWA 5 mg/m³
ACGIH TLV: TWA 5 mg/m³

 The Tetrasodium pyrophosphate, with the CAS registry number 7722-88-5, is also known as Diphosphoric acid tetrasodium salt; Pyrophosphoric acid tetrasodium salt; Sodium diphosphate.It belongs to the product inorganic salts. Its EINECS number is 231-767-1.This chemical's molecular formula is Na₄P₂O₇ and molecular weight is 265.90. What's more,Its systematic name is Tetrasodium pyrophosphate. It is Used as printing and dyeing bleaching agent, softener, etc.

Physical properties about Tetrasodium pyrophosphate are:(1)ACD/LogP: -3.42; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -7.96; (4)ACD/LogD (pH 7.4): -8.64; (5)ACD/BCF (pH 5.5): 1.00; (6)ACD/BCF (pH 7.4): 1.00; (7)#H bond acceptors: 7; (8)#H bond donors: 4; (9)#Freely Rotating Bonds: 2.

The Tetrasodium pyrophosphate may cause damage to health. It is irritating to eyes, respiratory system and skin. In case of contact with eyes, you should rinse immediately with plenty of water and seek medical advice. Whenever you will contact it, please wear suitable protective clothing, gloves and eye/face protection. In case of accident or if you feel unwell seek medical advice immediately .

Tetrasodium pyrophosphate (CAS NO.7722-88-5) is manufactured by reacting phosphoric acid and soda ash to yield a disodium phosphate solution, which may be dried to give anhydrous disodium phosphate (Na2HPO4) or crystallized to give disodium phosphate dihydrate (Na2HPO4.2H2O) or disodium phosphate heptahydrate (Na2HPO4.7H2O).
These compounds are calcined at a high temperature in an oil-fired or gas-fired rotary kiln to yield tetrasodium pyrophosphate (Fig. l).
2Na₂HPO₄ → Na₄P₂O₇ + H₂O
2Na₂HPO₄.2H₂O → Na₄P₂O₇ + 5H₂O

FIGURE 3 Manufacture of sodium polyphosphate.

You can still convert the following datas into molecular structure:
(1)SMILES:[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O;
(2)Std. InChI:InChI=1S/4Na.H4O7P2/c;;;;1-8(2,3)7-9(4,5)6/h;;;;(H2,1,2,3)(H2,4,5,6)/q4*+1;/p-4;
(3)Std. InChIKey:FQENQNTWSFEDLI-UHFFFAOYSA-J.

The toxicity data of Tetrasodium pyrophosphate as follows: