PYROPHOSPHORIC ACID 85% - IN STOCK
Molecular formula: H4P2O7

| Molar mass | 177.98 g/mol |
| Melting point | 71.5 °C (160.7 °F; 344.6 K) |
| Solubility in water | Extremely soluble |
| Solubility | Very soluble in alcohol, ether |
| Origin | China |
It is used to clean metal surface rust, as well as to prevent further destruction.