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Technical specifications
Basic Information
| Projects | Parameters |
|---|---|
| Product name | Potassium Pyrophosphate |
| English name | Tetra Potassium Pyrophosphate (TKPP) |
| CAS No. | 7320-34-5 |
| Chemical Formula | K4P2O7 |
| Molecular weight | 330.34 |
| Appearance | White powder or lumps |
| Bulk density | More than 0.3 |
| Melting Point | 1100℃ |
Physical and chemical properties
| Projects | Description |
|---|---|
| Appearance | White powder or lumps |
| Water soluble | Readily soluble in water (high solubility, 187 g/100 g water at 25°C) |
| Alcohol Soluble | Insoluble in Alcohol |
| Hygroscopicity | Low hygroscopicity |
| pH (aqueous solution) | 10.1–10.7, alkaline environment |
| Melting Point | 1100℃ |
| Bulk density | More than 0.3 |
Technical specifications — technical grade
| Serial Number | Indicator name | Requirements |
|---|---|---|
| 1 | Main content, % ≥ | 98 |
| 2 | P2O5 % ≥ | 42.2 |
| 3 | Cl % ≤ | 0.005 |
| 4 | Iron (Fe) % ≤ | 0.008 |
| 5 | Water-insoluble substances % ≤ | 0.2 |
| 6 | pH | 10.1 — 10.7 |
| 7 | Heavy Metals % ≤ | 0.003 |
| 8 | Fluorine % ≤ | 0.001 |
| 9 | Arsenic % ≤ | 0.005 |
| 10 | Loss on ignition % ≤ | 0.5 |
Technical specifications – food grade
| Serial Number | Indicator name | Requirements |
|---|---|---|
| 1 | Main content, % ≥ | 98 |
| 2 | P2O5 % ≥ | 42.2 |
| 3 | Cl % ≤ | 0.001 |
| 4 | Iron (Fe) % ≤ | 0.003 |
| 5 | Water-insoluble substances % ≤ | 0.1 |
| 6 | pH | 10.1 — 10.7 |
| 7 | Heavy Metals % ≤ | 0.001 |
| 8 | Fluorine % ≤ | 0.001 |
| 9 | Arsenic % ≤ | 0.0003 |
| 10 | Loss on ignition % ≤ | 0.5 |
Packaging and Storage
| Projects | Description |
|---|---|
| Packaging method | Inner plastic, outer woven bag |
| Packaging Specification | 25 kg/bag, 50 kg/bag, 1000 kg/bag (big bag) |
| Storage Conditions | Store in a dry, well-ventilated area |
| Safety Precautions | Protect from moisture, slightly hygroscopic. |
Product description
Product overview
Tetrapotassium pyrophosphate (TKPP), CAS 7320-34-5, has the formula K₄P₂O₇ and a molecular weight of 330.34. It is a white powder or granule with a bulk density above 0.3 and a melting point of 1100°C. It is soluble in water, insoluble in alcohol, produces an alkaline aqueous solution, and is slightly hygroscopic.
Physical and chemical properties
- AppearanceWhite powder or granules
- Water solubleEasily soluble in water (solubility 187 g/100 g water at 25°C)
- Alcohol SolubleInsoluble in Alcohol
- HygroscopicitySlightly hygroscopic
- Melting Point: 1100℃
- pHAqueous solution 10.1-10.7, alkaline
- Bulk density0.3 and above
Specification Standard
| Level | Main Content | Main Application |
|---|---|---|
| Technical Grade | ≥ 98% | Cyanide-free electroplating, detergents, metal cleaning |
| Food Grade | ≥ 98% | Food Additive for Processing |
Quality Indicators
Area of application
Non-porous electroplated coating
Mainly used in non-cyanide electroplating processes; it is an important chemical reagent for electroplating.
- Preparation of Cyanide-Free Electrolyte
- Surface Preparation Agent for Galvanizing
- Electrolyte for pyrophosphate plating
- Galvanic Additives
Detergent Industry
It is an important component of various cleaning products, widely used for laundry and home cleaning.
- Fabric detergents
- Metal cleaning agents
- Bottle washing detergent
- Industrial Cleaning Agents
- Surfactant component
Metal treatment
For treatment and cleaning of metal surfaces.
- Metal cleaning agent
- Bottle washing agent
- Metal Surface Treatment
Ceramics industry
Used as a clay dispersant, plays an important role in ceramic production.
- Clay Dispersant
- Ceramic Glazes
- Ceramic Additives
Other industrial applications
High-quality raw materials for various industries.
- Water Treatment Reagent
- Food processing (food grade)
- Pharmaceutical intermediates
- Laboratory Reagents
- Store in a cool, dry, well-ventilated place, avoid humid conditions.
- The product is slightly hygroscopic; after opening the package, use as soon as possible or store in a tightly sealed container.
- Avoid direct mixing with acidic substances to prevent chemical reaction.
- During transportation, protect from moisture and rain, avoid damaging the packaging.
- When using, it is recommended to wear protective gloves and a mask, avoid direct contact with skin and inhalation of dust.
Frequently asked questions
Both are important pyrophosphates; the main difference lies in the different cations:
- Various chemical formulasTKPP is K₄P₂O₇ (potassium pyrophosphate), sodium pyrophosphate is Na₄P₂O₇
- Potassium ions vs sodium ionsTKPP supplies potassium ions, while sodium pyrophosphate supplies sodium ions.
- Differences in applicationTKPP is often used in electroplating and detergents; sodium pyrophosphate is often used as a food additive.
Tetrapotassium pyrophosphate is an important raw material for non-cyanide electroplating:
- Eco-Friendliness and SafetyContains no cyanides, eliminating the risk of cyanide poisoning and environmental pollution.
- Coverage qualityA smooth, fine-grained coating can be achieved
- Process stabilityStability of electroplating solution, proven technology
The alkaline nature of an aqueous solution of potassium pyrophosphate is its chemical property:
- Causes of AlkalinityK₄P₂O₇ hydrolyzes in water to form OH⁻ ions.
- pH rangepH of 1% aqueous solution is 10.1-10.7
- Safety PrecautionsNot recommended for direct mixing with acidic substances
The main difference lies in impurity content standards and application areas.
- Impurity LimitFood grade imposes stricter requirements on impurities such as heavy metals, arsenic, and chlorine.
- Water-insoluble substancesFood grade ≤0.1%, industrial grade ≤0.2%
- Area of applicationFood grade is used in the food industry; industrial grade in electroplating, detergents, etc.
Our potassium pyrophosphate is available in various packaging options:
- 25 kg/bagInner plastic, outer woven bag packaging, suitable for small and medium batch purchases
- 50 kg/bagInner plastic, outer woven bag packaging, suitable for standard purchases.
- 1000 kg/bag (big bag)Suitable for bulk purchases, lower cost
Packaging: inner polyethylene bag, outer woven bag. Store in a dry, well-ventilated place.
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