Sodium Phosphate Dibasic CAS 7558-79-4

Synonyms: Disodium phosphate
Disodium hydrogen phosphate
Sodium phosphate dibasic anhydrous
Molecular Formula: Na2HPO4
Molecular Weight: 141.96
Hazard Class:General cargo
HS Code: 2835299000
Grade:Food grade 98.0%
Industrial grade 97.0%
Feed grade 98.0%
Analytical purity 99.0%, chemical purity 98.0%

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Model:
7558-79-4
Brand:
bosschemical
Code:
7558-79-4

Product Description

What is of Sodium Phosphate Dibasic CAS 7558-79-4？

Sodium phosphate dibasic (disodium hydrogen phosphate, Na₂HPO₄) is a highly water-soluble inorganic compound. It is widely used as a buffering agent, food additive (thickener/emulsifier).

Specification

Test Item	Industrial Grade Standard
Main Content (as Na₂HPO₄·12H₂O), mass fraction /% ≥	97.0
Sulphate (as SO₄²⁻), mass fraction /% ≤	0.7
Chloride (as Cl), mass fraction /% ≤	0.05
Arsenic (As), mass fraction /% ≤	0.005
Fluoride (as F), mass fraction /% ≤	0.05
Iron (Fe), mass fraction /% ≤	0.05
Water Insoluble Matter, mass fraction /% ≤	0.05
pH Value (10 g/L aqueous solution)	9.0±0.2

Test Item	Food Grade Standard	Feed Grade Standard
Main Content (dry basis, Na₂HPO₄), mass fraction /% ≥	98.0	98.0
Loss on Drying (Anhydrous Na₂HPO₄), mass fraction /% ≤	5.0	5.0
Loss on Drying (Dihydrate Na₂HPO₄·2H₂O), mass fraction /%	18.0~22.0	—
Loss on Drying (Dodecahydrate Na₂HPO₄·12H₂O), mass fraction /% ≤	61.0	—
Water Insoluble Matter, mass fraction /% ≤	0.2	0.2
Heavy Metals (as Lead), mg/kg ≤	10	—
Fluoride (F), mg/kg ≤	50.0	100
Arsenic (As), mg/kg ≤	3.0	10
Chromium (Cr), mg/kg ≤	—	10
Lead (Pb), mg/kg ≤	4.0	10

Test Item	AR (Analytical Reagent)	CP (Chemical Pure)
Appearance	Complies with standard	Complies with standard
Assay Content /%	≥99.0	≥98.0
Clarity Test	Complies with standard	Complies with standard
Water Insoluble Matter /%	≤0.005	≤0.01
Chloride (Cl) /%	≤0.001	≤0.003
Sulphate (SO₄²⁻) /%	≤0.01	≤0.03
Nitrogen Compounds (N) /%	≤0.002	≤0.003
Potassium (K) /%	≤0.01	≤0.1
Iron (Fe) /%	≤0.0005	≤0.001
Arsenic (As) /%	≤0.0005	≤0.002
Heavy Metals (as Lead) /%	≤0.0005	≤0.001

Application Scenarios:

Food Grade:

1. Premium Milk Powder, Soy Milk Powder, and Coffee Creamer (Non-dairy Cream): As an acidity regulator and anti-caking agent. It stabilizes the pH of the powder system, preventing proteins from coagulating or precipitating due to pH changes during reconstitution; it also maintains the powder's looseness and flowability.

2. Baking Premixes and Baked Goods: Used in combination with acidic ingredients (such as SAPP) as a buffer in complex leavening agents. Its anhydrous form does not release moisture into the flour during storage, thus extending the shelf life of the premix and ensuring effective gas production during baking.

3. Processed Cheese and Condensed Milk: As a highly efficient emulsifying salt. Anhydrous disodium hydrogen phosphate prevents the separation of fat and water in cheese during high-temperature processing, resulting in a smooth, uniform texture and preventing protein hardening during high-temperature sterilization.

4. Meat Products and Minced Meat: Improves the water-holding capacity of meat, locks in juices, and increases the elasticity and juiciness of the finished product.

Daily Chemical Grade:

1. Phosphate-free/Low-phosphorus Detergent Additive: Acts as a pH buffer in liquid or powdered detergents. It stabilizes the pH of the detergent solution within the optimal slightly alkaline range for stain removal, while also possessing a certain ability to chelate hard water ions (calcium, magnesium), preventing dirt from redepositing on fabrics.

2. Toothpaste Quality Improver: Adjusts the pH of toothpaste and, in synergy with other phosphates, provides a certain degree of tartar prevention and fluoride stabilization.

Industrial Grade:

1. Industrial Boiler Water Scale Inhibitor: Adding anhydrous disodium hydrogen phosphate to boiler water reacts with calcium and magnesium hardness ions in the water to form loose, non-adherent phosphate salt sludge, which is regularly discharged through blowdown, thus preventing boiler scaling.

2. Metal Surface Passivation and Electroplating: Used for phosphating metal surfaces before painting to form a protective film to prevent rust and enhance paint adhesion; also used as a buffer in the electroplating industry.