CAS · 7758-16-9
Product Overview
Disodium pyrophosphate丨CAS 7758-16-9 is a versatile inorganic phosphate compound used extensively across industries such as food processing, water treatment, metal finishing, detergents, and ceramics. It belongs to the family of pyrophosphates, which are compounds containing the anion P₂O₇⁴⁻. SAPP exhibits acidic buffering, sequestration, and dispersing properties, which contribute to its utility in diverse applications.
Product Specifications
| Appearance | White powder |
|---|---|
| Identification test | Pass the test |
| Content of Na2H2P2O7 | 94.0% min |
| Water insoluble matter | 0.6% max |
| pH (10g/L aqueous solution) | 4.0 ± 0.5 |
| Fluorine (F) | 50.0 mg/kg max |
| Lead (Pb) | 2.0 mg/kg max |
| Arsenic (As) | 3.0 mg/kg max |
| Heavy metal (Pb) | 10 mg/kg max |
Applications
1. Food Industry (as Food Additive E450)
One of the most common uses of disodium pyrophosphate is in processed foods, where it functions as:
● Leavening agent in baked goods (e.g., pancakes, muffins, frozen dough)
● Stabilizer and emulsifier in processed meats and canned seafood
● Color retention agent in potato products (e.g., frozen French fries)
● Sequestrant to bind metal ions and prevent oxidation
Specific Food Applications:
● Leavening: Reacts with baking soda to release CO₂ gas in baking powders
● Cured meats: Maintains red color by preventing iron-catalyzed oxidation
● Potatoes: Prevents darkening by inhibiting iron-polyphenol interactions
Its rapid-acting, medium-slow leavening action makes it ideal in time-sensitive baking processes.
2. Water Treatment
Disodium pyrophosphate acts as a sequestering agent, forming stable complexes with metal ions such as calcium and magnesium. This is crucial for:
● Softening hard water
● Preventing scale formation in boilers and pipelines
● Controlling corrosion in municipal and industrial water systems
Its ability to chelate metal ions helps maintain water clarity and system efficiency.
3. Detergent and Cleaning Formulations
Disodium pyrophosphate丨CAS 7758-16-9 is used in cleaning products as a:
● Water softener
● Dispersing agent to prevent redeposition of soil
● pH buffer in detergents and soap formulations
These roles enhance cleaning power in both household and industrial applications, particularly in automatic dishwashing and laundry detergents.
4. Metal Treatment and Surface Cleaning
In metal processing industries, disodium pyrophosphate serves as a:
● Fluxing agent in electroplating
● Rust remover in surface treatment
● Buffering agent in metal cleaning baths
Its ability to bind metal ions helps dissolve oxides, clean surfaces, and prepare them for coating or bonding.
5. Ceramics and Paints
In ceramics, SAPP is used as:
● Dispersant for ceramic slips and glazes
● Deflocculant to control viscosity
In paints, it acts as a stabilizer and rheology modifier, especially in water-based formulations, improving shelf life and application consistency.
6. Dentistry and Oral Care
Disodium pyrophosphate is incorporated into toothpaste and oral care products for:
● Tartar control: It inhibits the crystallization of calcium phosphate, thereby reducing calculus formation on teeth.
● Whitening formulations: Helps prevent stain deposition
Its inclusion in many anti-tartar and whitening toothpastes supports long-term oral hygiene.
Benefits
1. Multi-Functional Performance
SAPP provides sequestering, buffering, dispersing, leavening, and stabilizing effects, making it extremely versatile for both food and industrial applications.
2. pH Control and Buffering
Maintains acidic to mildly acidic pH, crucial in baking, metal treatments, and cleaning formulations.
3. Non-Toxic and Food-Safe
When used within regulated limits, it is non-toxic and safe for human consumption, as approved by:
● FDA (GRAS status in food)
● EFSA (E450)
● FAO/WHO Codex Alimentarius
4. Water Softening and Metal Ion Control
Its strong chelating ability improves cleaning efficiency, food texture, and product stability, particularly in hard water environments.
5. Improves Product Appearance and Quality
In food processing:
● Retains color and firmness in vegetables and meats
● Prevents discoloration in potato and seafood products
In oral care:
● Keeps teeth cleaner and whiter for longer by inhibiting plaque and stain buildup
Conclusion
A concise summary and suitability assessment for this product is available on request. Contact our team to discuss whether it fits your process and quality requirements.