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Technical Specifications
Chemical and Physical Specifications
| No. | Specification Name | Industrial Grade | Food Grade |
|---|---|---|---|
| 1 | Main Content | ≥ 98.0% | ≥ 98.0% |
| 2 | Phosphorus Pentoxide (P₂O₅) | ≥ 32.8% | ≥ 32.8% |
| 3 | Potassium oxide (K₂O) | ≥ 65.0% | ≥ 65.0% |
| 4 | Water Insolubles | ≤ 0.1% | ≤ 0.05% |
| 5 | pH (1% aqueous solution) | 11.5 — 12.5 | 11.5 — 12.5 |
| 6 | Fluoride | — | ≤ 0.003% |
| 7 | Heavy Metals (as Pb) | — | ≤ 0.001% |
| 8 | Arsenic (as As) | — | ≤ 0.0003% |
Physical Properties
| Item | Description |
|---|---|
| Appearance | White Powder |
| Hygroscopicity | Hygroscopic |
| Water Solubility | Easily soluble in water, insoluble in alcohol |
| Corrosiveness | Strongly Corrosive |
| Aqueous Solution | Alkaline Reaction |
| pH (1% aqueous solution) | 11.8 |
| Melting Point | 1340°C |
| Relative Density | 2.564 |
Product Introduction
Product Overview
Tripotassium Phosphate (TKP), CAS No. 7778-53-2, chemical formula K₃PO₄, molecular weight 212.27. This product is a white powder, hygroscopic, easily soluble in water, insoluble in alcohol, highly corrosive, aqueous solution exhibits alkaline reaction.
Physicochemical Properties
- AppearanceWhite powder, hygroscopic
- Water SolubilitySoluble in water, insoluble in alcohol
- CorrosivenessHighly corrosive
- pH Value1% aqueous solution 11.8, alkaline
- Melting Point: 1340°C
- Relative Density: 2.564
Specification Standards
| Grade | Main Content | Main Applications |
|---|---|---|
| Industrial Grade | ≥ 98.0% | Liquid Soap, Paper, Boiler Water Treatment |
| Food Grade | ≥ 98.0% | Emulsifiers, Fortifiers, Flavoring Agents |
Quality Specifications
Frequently Asked Questions
All three are important potassium phosphate salts, with the main differences being potassium content and alkalinity:
- Chemical FormulaTKP is K₃PO₄, MKP is KH₂PO₄, DKP is K₂HPO₄
- K₂O Content: TKP≥65%，MKP≥34%，DKP≥53%
- P₂O₅ Content: TKP≥32.8%，MKP≥52%，DKP≥40%
- pH ValueTKP is 11.8 (strongly alkaline), MKP/DKP is 8.6-9.4 (weakly alkaline)
- Selection SuggestionsFor agricultural use, MKP is the preferred choice; for food emulsifiers and water treatment, TKP is recommended.
The strong alkalinity of tripotassium phosphate aqueous solution is its chemical characteristic:
- Alkalinity ReasonK₃PO₄ hydrolyzes in water to produce OH⁻ ions
- pH Range1% aqueous solution pH value 11.8
- Usage NotesHighly corrosive; not suitable for direct mixing with acidic substances
The main difference lies in the impurity content standards:
- Water InsolublesFood grade ≤0.05%; industrial grade ≤0.1%
- FluorideFood grade ≤0.003%; no requirement for industrial grade
- Heavy MetalsFood grade ≤0.001%; no requirement for industrial grade
- ArsenicFood grade ≤0.0003%; no requirement for industrial grade
Our tripotassium phosphate products support multiple packaging specifications:
- 25 kg/bagInner plastic outer woven, suitable for small to medium batch purchases
- 50 kg/bagInner plastic outer woven, suitable for general purchasing needs
- 1000 kg/bag (Tote Bag)Suitable for bulk purchasing
Packaging: Inner plastic outer woven, store in a ventilated and dry place.
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