Tetrasodium Pyrophosphate (CAS 7722-88-5), chemically identified as tetrasodium diphosphate, is an inorganic salt functioning as a buffering agent, emulsifier, and thickening agent in food processing and industrial detergent formulations. Sodium Carbonate is a related alkaline builder for detergent formulations. This white crystalline powder or granule, widely technically recognized as TSPP or anhydrous sodium pyrophosphate, acts as a sequestering agent to bind calcium and magnesium ions, effectively preventing tartar formation in toothpaste and improving water retention in processed meats. We provide bulk supply of this food (E450iii) and technical grade ingredient with competitive factory pricing to optimize material costs for diverse manufacturing sectors. Our production line strictly controls the pH and solubility parameters, making MSDS, TDS, COA available alongside customized specifications to meet specific decahydrate or anhydrous requirements.
Tetrasodium Pyrophosphate (TSPP) CAS 7722-88-5
- CAS: 7722-88-5
- Synonyms: TSPP, Tetrasodium diphosphate, Sodium pyrophosphate anhydrous, Tetrasodium phosphate, Diphosphoric acid tetrasodium salt
- Einecs: 231-767-1
- Molecular Formula: Na₄P₂O₇
- Grade: Industrial / Detergent / Food Grade
- Package: 25 kg PE-lined woven bags or kraft paper bags; 1000 kg jumbo bags; other packing on request
Product Description
Sodium pyrophosphate (tetrasodium pyrophosphate, TSPP) is an inorganic phosphate salt widely used as a detergent builder, dispersant, water softener and pH buffer in detergents, water treatment, ceramics, metal surface cleaning and food processing. It offers strong sequestering ability for Ca²⁺/Mg²⁺ ions, excellent dispersion performance and stable alkalinity in aqueous systems.
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- CAS: 7722-88-5
- Einecs (EC No.): 231-767-1
- Molecular Formula: Na₄P₂O₇
- Typical Grade: Industrial / Detergent / Food Grade
- Typical Package: 25 kg PE-lined woven bags or kraft paper bags; 1000 kg jumbo bags; other packing on request
Physicochemical Properties
| Item | Typical value (anhydrous TSPP) |
|---|---|
| Chemical name | Sodium pyrophosphate / Tetrasodium pyrophosphate |
| CAS No. | 7722-88-5 |
| EC (Einecs) No. | 231-767-1 |
| Molecular formula | Na₄P₂O₇ |
| Molecular weight | ≈ 265.9 g/mol |
| Appearance | White, crystalline powder or granules, odorless |
| Density (20–25 °C) | ~2.5–2.53 g/cm³ |
| Melting point (anhydrous) | ≈ 988–995 °C |
| Solubility in water (0 °C) | ≈ 2.6–3.2 g/100 mL |
| Solubility in water (25 °C) | ≈ 6.2–6.7 g/100 mL |
| Solubility in water (100 °C) | ≈ 40–42 g/100 mL |
| Solubility in alcohol | Insoluble in ethanol / most alcohols |
| pH (1% aqueous solution) | Typically 10.0–10.6 (alkaline) |
| Assay (as Na₄P₂O₇) | ≥ 95.0–99.0% (depending on grade) |
| P₂O₅ content | Approx. 52.5–54.0% |
| Water insolubles | ≤ 0.10% |
| Loss on ignition | ≤ 0.5% @ 550 °C |
| Bulk density | Typically 0.55–0.70 kg/L |
| Stability | Hygroscopic; aqueous solution slowly hydrolyses to orthophosphate |
Applications
- Detergent and cleaning formulations
- Builder and water softener in household and industrial detergents
- Improves detergency by sequestering Ca²⁺/Mg²⁺, preventing redeposition of soil on fabrics and surfaces
- Water treatment & boiler compounds
- Softening of process water; helps to control hardness and scale formation
- Used in some boiler treatment formulations as dispersant and conditioning agent
- Metal surface cleaning & electroplating
- Degreasing and de-rusting agent in metal cleaning formulations
- Complexes metal ions in electroplating baths, improving bath stability and surface finish
- Ceramics, paper and clay processing
- Dispersant for clay, kaolin, titanium dioxide and other pigments in ceramic and paper slurries
- Improves fluidity and reduces viscosity, enabling higher solids content and better coating performance
- Food industry (Food Grade, E450(c))
- Buffering agent, emulsifier and water-retention agent in processed meat, seafood, bakery and dairy products
- Functions as calcium sequestrant, improves texture and reduces cooking loss in meat and plant-based products
- Other uses
- Component in toothpaste and dental products as tartar control agent
- Additive in some textile, leather and oilfield formulations where dispersion and complexing are needed
For detailed application matching to your formulation, please email info@industrochem.com with your process and target specifications.
For related condensed phosphate raw materials, see Sodium Acid Pyrophosphate and Sodium Tripolyphosphate.
Storage Conditions
- Store in a cool, dry and well-ventilated warehouse, away from moisture and direct sunlight.
- Keep bags tightly sealed after opening to avoid moisture uptake and caking (product is hygroscopic).
- Avoid contact with acids and strong oxidizing agents; TSPP is alkaline and may react with acids exothermically.
- Recommended shelf life: 24 months in original unopened packaging under proper storage conditions (actual shelf life depends on storage environment).
Safety Precautions
(General handling information; always follow your local SDS and regulations.)
- Hazard profile
- Alkaline, irritating to eyes, skin and respiratory tract in dust form.
- Personal protection
- Avoid breathing dust; use local exhaust or dust collection in handling and packaging areas.
- Wear suitable PPE: dust mask or respirator, safety goggles, protective gloves and work clothing.
- Handling advice
- Handle gently to minimize dust generation.
- Do not eat, drink or smoke while handling chemicals; wash hands thoroughly after work.
- First-aid (basic)
- Eye contact: Rinse cautiously with plenty of clean water for several minutes; remove contact lenses if easy to do; seek medical advice if irritation persists.
- Skin contact: Wash off with water and mild soap; change contaminated clothing.
- Inhalation: Move the person to fresh air; seek medical attention if breathing difficulty or persistent irritation occurs.
- Ingestion: Rinse mouth with water; do not induce vomiting; get medical advice if a large amount is swallowed.
For a full SDS and regulatory support (REACH, GHS labels, etc.), please contact info@industrochem.com.
FAQ - Technical & Supply Chain
-
Q:
What is Tetrasodium Pyrophosphate CAS 7722-88-5?
A: Tetrasodium pyrophosphate, commonly called TSPP, is the tetrasodium salt of pyrophosphoric acid. It is a white powder or granular solid used as a sequestrant, dispersant, emulsifier and alkaline builder. -
Q:
What is the typical pH of TSPP in solution?
A: A 1% solution is moderately alkaline, usually around pH 10.0-10.8. Formulators should allow for this alkalinity when adding acids or when using TSPP in pH-sensitive systems. -
Q:
Why is TSPP used in processed meat?
A: It modifies meat proteins, helping increase water-holding capacity, improve texture and reduce cooking loss. It is used only where the appropriate food-grade material and local food regulations permit it. -
Q:
What are the main applications?
A: TSPP is used in detergents and cleaners as a builder and dispersant, in food processing as an emulsifying salt and texturizer, in water treatment for sequestration and scale control, and in ceramics, textiles, electroplating and mineral processing. -
Q:
What sequestration and dispersion benefits does it provide?
A: The pyrophosphate anion complexes calcium, magnesium and heavy-metal ions, helping soften water, suspend soil, control scale and stabilize dispersions in cleaning and industrial systems. -
Q:
Which grades and packaging are available?
A: The listing covers industrial, detergent and food grades. It is supplied in 25 kg PE-lined woven bags or kraft paper bags and 1000 kg jumbo bags, with other packing available on request. -
Q:
What specifications should be checked before ordering?
A: Confirm grade, assay, P2O5 content, pH, water-insoluble matter, orthophosphate, heavy metals, arsenic, fluoride and loss on ignition. Request the current batch analysis, technical data and safety information before purchase. -
Q:
How should TSPP be stored and handled?
A: Store in tightly closed containers in a cool, dry, ventilated area away from acids, moisture and incompatible materials. Use dust-control measures, suitable gloves and eye protection, and follow the safety information for handling and disposal.
Ordering & Documentation
Key information for document requests, quotations, and supply planning.
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Sample & Supply
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Storage & Shipping
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