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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


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