Potassium Pyrophosphate
CAS Number: 7320-34-5
Molecular formula: K4P2O7
Molecular weight: 330.34, the appearance is white powder or block. It is soluble in water but insoluble in alcohol. It is hygroscopic in the air.
Uses: Mainly used for anaerobic electroplating and also used in detergent industry.
When hydrogen peroxide is used as an oxidant to bleach leather products, it is often used as a stabilizer, and the effect is remarkable. In the washing industry, there are two specific conditions that must be potassium pyrophosphate. One is a heavy-duty liquid detergent that controls foam, and the other is a metal surface cleaning agent. This cleaning agent is alkaline and helps protect the metal surface.
Main quality standards:
| Indicator name |
Premium |
Special grade |
Food grade |
| Total content K4P2O7 |
96% |
98% |
98%-101% |
| Cl |
0.45% |
0.45% |
0.011% |
| Fe |
0.005% |
0.005 or 0.0015% |
10ppm |
| P2O5 |
41.2% or more |
42.27% or more |
42.2% or more |
| Water insoluble matter |
0.08% |
0.05% |
0.05% |
| Orthophosphate |
Titration with 0.1NAgNO3, no yellow precipitate |
| Heavy metal (Pb) |
0.01% |
0.005% |
20ppm |
| Burning weightlessness |
1% |
0.8% |
0.8% |
| Apparent |
White powder or granular |
White powder |
| SO4 |
|
|
0.019% |
| F |
|
|
10ppm |
| As |
|
|
3ppm |
| PH |
10.0～10.7 |
| Aqueous state |
Colorless or slightly turbid |
| Shelf life |
18 months |
12 months |
12 months |
