Best Disodium Phosphate Anhydrous CAS 7558-79-4

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Disodium Phosphate Anhydrous

Products Description

Name: Disodium Phosphate Anhydrous

Cas: 7558-79-4

Purity: 99%min


Basic Info:







Stock Availability

In stock

Brand Name

Look chem



Product Introduction:

Disodium Phosphate Anhydrous, also known as sodium monohydrogen phosphate and disodium hydrogen phosphate, has the chemical formula Na2HPO4, which is one of the sodium hydrochloride salts produced by phosphoric acid. It is a deliquescent white powder, soluble in water, and its aqueous solution is weakly alkaline.

Disodium Phosphate Anhydrous can be regarded as a product obtained by using phosphoric acid H3PO4 as the parent and replacing all the three hydrogen ions H+ contained in its molecular formula with three metal sodium atoms Na.

Because phosphoric acid H3PO4 is a tribasic acid, its molecular formula has 3 hydrogen ions that can be replaced by gold. It is easy to weather in the air. When placed in the air at room temperature, it loses about 5 crystal water to form heptahydrate. When heated to 100℃, it loses all crystal water and becomes anhydrous. It decomposes to sodium pyrophosphate at 250℃.

Disodium hydrogen phosphate is an important chemical raw material and is widely used in industrial sectors such as biological fermentation, food, medicine, feed, chemical industry and agriculture.

Product Nature:

  • Melting point: 243-245°C
  • Density: 1.064g/mLat20°C
  • Acidity coefficient (pKa): (1) 2.15, (2) 6.82, (3) 12.38 (at 25℃)
  • Storage conditions: Storeat+5°Cto+30°C.
  • Solubility: H2O:0.5Mat20°C,clear,colorless


Product NameDisodium Phosphate Anhydrous Powder
CAS No.7558-79-4
Appearance White crystalline powder
Content99% min
Shelf Life2 years
Packing1kg/bag,25kg/bag or as your requirements

Disodium Phosphate Anhydrous properties:

Disodium Phosphate Anhydrous is a white crystalline powder with a relative density of 1.52. It is easily weathered in the air and easily loses five molecules of crystal water to form heptahydrate (Na2HPO4.7H2O).

Disodium hydrogen phosphate is soluble in water but insoluble in alcohol at room temperature. Its aqueous solution is slightly alkaline (pH of 0.1-1N solution is about 9.0). It loses crystal water at 100°C and becomes anhydrous, and decomposes into sodium pyrophosphate at 250°C.

Uses of Disodium Phosphate Anhydrous:

  • Disodium Phosphate Anhydrous can be used as industrial water treatment agent, printing and dyeing detergent, quality improver, antibiotic culture agent, biochemical treatment agent, etc.
  • Disodium hydrogen phosphate can be used as a flame retardant for cloth, wood and paper, and as a weighting agent for silk. Auxiliaries for the production of reactive dyes. At the same time, it can be used instead of borax in welding and brazing.
  • Used as a food quality improver
  • In the printing and dyeing industry, Disodium Phosphate Anhydrous can be used as analytical reagents, buffers, water softeners, flame retardants, and also used to increase the weight of fabrics.
  • In daily life, Disodium Phosphate Anhydrous is also used as analytical reagent and pH reference reagent
  • Disodium Phosphate Anhydrous is used as flame retardant, glaze, welding flux, dyeing medium, hydrogen peroxide bleach stabilizer, boiler water softener, etc. for wood, paper and cloth.
  • Disodium Phosphate Anhydrous is used as water softener, fabric weighting agent, flame retardant, used to prepare glaze, solder, medicine, pigment, food industry and other phosphates, industrial water treatment agent, printing and dyeing detergent, quality improver.
  • Used as neutralizing food, quality improver, antibiotic culture agent, biochemical treatment agent


  1. “MSDS”. Archived from the original on 2017-10-28. Retrieved 2011-09-26.
  2. Wikipedia


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* The sample supports testing and inspection.

* Each batch of products will be tested to ensure that its quality meets user needs.

*Packaging can also be made according to customer requirements.

*Any inquiries will be answered by our relevant personnel within 24 hours.

*We will provide you with commercial invoice, packing list, packing list, COA, health certificate and certificate of origin if you need it. If your market has other special requirements, please let us know.


After-Sales Service

*We will monitor the logistics information in real time and will share the information with you.

* You can consult us at any time if you have any questions about the product, and we will answer you in time.

*If you have any questions about the product, you can report it to us, we will deal with it in time for you, and the product can be returned.


1. ≤50kg, we recommend express delivery, usually called DDU service;

2. ≤500kg, air transportation is generally recommended, usually called FOB, CFR or CIF service;

3.>500kg, sea freight is generally recommended, usually called FOB, CFR or CIF service;

4. For high-value products, please choose air and express to ensure the safety of the products.


Do you accept sample order?

We will make samples before mass production. After the samples are approved by the department and users, we will start mass production. During the production process, we will carry out 100% inspection, and then carry out random inspection before packaging.

How to confirm whether the product quality meets our needs before placing an order?

You can consult us to get free samples of some products, you only need to pay the freight or arrange express delivery to us and get the samples. You can send us the product specifications and requirements you need, and we will manufacture products according to your requirements.

What’s your MOQ?

Our MOQ is 1kg. But usually we can also accept a smaller quantity, such as 100g, if you need it, provided that the sample fee is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.

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Packaging and shipping

Disodium Phosphate Anhydrous
disodium hydrogen phosphate
Disodium Phosphate Anhydrous