Tetrapotassium Pyrophosphate
TKPP, Tetrakal
- CAS
- 7320-34-5
- EC
- 230-785-7
- Food Code
- E450
- Sectors
- Food & Nutrition, Water & Wastewater Treatment
Tetrapotassium Pyrophosphate (CAS 7320-34-5), also known as potassium diphosphate tetrabasic, is a white crystalline powder and a potassium phosphate salt used as a buffering and chelating agent, as a food emulsifier, preservative, humectant and thickener under code E450, and in water treatment, detergents and fertilizers. Density 2.53 g/cm³, melting point 1109°C, highly soluble in water (187 g/100mL at 25°C), forming alkaline solutions; insoluble in alcohol; produced industrially, nontoxic.
Typical Properties
| Molecular formula | H4O7P2.4K |
|---|---|
| Molecular weight | 330.337 g/mol |
| Appearance | White crystalline powder |
| Form | Powder |
| Color | White |
| Odor | Odorless |
| Melting point | 1090 °C |
| Density | 2.33 |
| Water solubility | SOLUBLE |
| pH | pH (40g/l, 25°C) : 10.0～11.0 |
| GHS signal word | Warning · Irritant / harmful |
| HS code | 28353990 |
| Grades available | Food Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Tetrapotassium Pyrophosphate
Applications
Used as buffering/chelating agent, ionic dispersant for low viscous solutions; in food as emulsifier, preservative, humectant, thickener; ionic dispersant for low viscous solutions; in fertilizers, detergents, water treatment for corrosion; in electroplating, paints, soaps; electrolytic solution for Li-ion batteries, copper nanowires arrays; in poultry processing.
Safety & Risks
Low toxicity, irritates eyes/skin/respiratory; reproductive toxin, impairs fertility; ingestion causes gastrointestinal issues; decomposes to phosphorus oxides; may lead to environmental phosphate pollution. Avoid strong acids; noncombustible; Hazard Class 8; use PPE, ventilate; essential nutrients but regulate concentrations in water.
Packaging
Offered in 50 lb multi-wall paper bags with moisture barrier or 2000 lb supersacks, designed for bulk handling.