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Quick Details

  • Classification: Phosphorous Acid
  • CAS No.: 13598-36-2
  • Other Names: H3PO3,Phosphonic acid, Orthophosphorus acid
  • MF: H3PO3
  • EINECS No.: 237-066-7
  • Place of Origin: Hubei, China (Mainland)
  • Grade Standard: Agriculture Grade, Electron Grade, Industrial Grade, Reagent Grade
  • Purity: 99%
  • Appearance: White Powder
  • Application: Fertilizer,reducing agent, nylon whitener, plastic thermometer
  • Brand Name: Kagro
  • Model Number: 99%
  • Color: White
  • Form: Powder
  • CAS NO: 13598-36-2
  • UN NO: 2834
  • Customized Design: Welcome
  • Sales Target: All of the World

Packaging & Delivery

Packaging Details 1. 25/50/1000kg bag.Double bag,inner PE,outer woven bag ;
2. Also we could supply packing according to the customer's requirement.
Delivery Time Shipped in 15 days after payment

Water Soluble Phosphorous Acid H3PO3 Industrial Agricultural Grade


1 Product Name:Phosphorous Acid     

2 Other Name: Phosphonic acid;orthophosphorous acid; hydrogen phosphonate;phosphorus(+3) trihydride cation trihydroxide   

3 Purity:99%

4 Molecular Formula: H3PO3

5 Molecular Weight:82.00

6 Appearance:White Powder

7 Standard:HG/T 2520-93

8 CAS No: 13598-36-2   

9 HS Code:2811199090 

10 EINECS No.:237-066-7 

11 Hazard Class:8 Class

12 UN No.:2834    

13 Packing Group:III

14 IMDG Packing Code:5H3

15 Package:25/50/1000kg Net Plastic Woven Bag

16 Application:Fertilizer,Reducing agent, nylon whitener, plastic thermometer, synthetic fiber in plastic industry

17 Certificates:COA,FSC,MSDS,CO,ISO Certificate & Inspection Report,Pre-shiment Inspection



Water Soluble Phosphorous Acid H3PO3 Industrial Agricultural Grade Property


Commodity:Phosphorous Acid     

Boiling Point: 200 °C (Decomposes)
Solubility: Easily soluble in water and alcohol.
Phosphorous acid is a colorless crystal. It can be slowly oxidized to phosphoric acid in the air. When heated to 180 °C, it can be decomposed into phosphoric acid and phosphine (highly toxic). As a dibasic acid, it has slightly ber acidity than phosphoric acid. Phosphorous acid has b reducibility and can easily reduce Ag+ to metal silver. It can also reduce sulfuric acid to sulfur dioxide. It is corrosive and has b hygroscopicity. 
Relative Density: 1.651 (21.1 °C)
Melting Point: 73.6 °C


Phosphorous acid is an intermediate in the preparation of other phosphorous compounds. It is a raw material to prepare phosphonates for water treatment such as iron and manganese control, scale inhibition and removal, corrosion control and chlorine stabilization. The alkali metal salts (phosphites) of phosphorous acid are being widely marketed either as an agricultural fungicide or as a superior source of plant phosphorous nutrition. Phosphorous acid is used in stabilizing mixtures for plastic materials. Phosphorous acid is used for inhibiting high-temperature of corrosion-prone metal surfaces and to produce lubricants and lubricant additives.


Water Soluble Phosphorous Acid H3PO3 Industrial Agricultural Grade Specification


Inspection items

The degree of the products

Best Grade

Best Grade

First grade

Main contents(counted with H3PO3)




Iron(counted with Fe)




Chloride(counted with C1)




Sulfate(counted with SO4)




Phosphate(counted with SO4)





White crystal

White crystal

White crystal

Water solution experiments

White crystal

Clear and achromatic

Clear and achromatic


Molecular Weight






Melting point


Boiling point



Achromatic crystal,density1.65g/m3,better hygroscopi-
city,dissolved easily in the water,has corrosive characteristics


Widely used as the raw materials to make phosphorous 
acid salt,used as the raw materials for making of plastic
stabilizator in the plastic industry,used as reducer in 
chemical reaction,also used in the olefin industry, 
agricultural chemical industry and so on.


Film Plastic Knitted Bag,kraft paper complex bag inner
layer,double layers plastic bag with net weight of 25kg


Water Soluble Phosphorous Acid H3PO3 Industrial Agricultural Grade Application


1. In industry and agriculture

 The most important use of phosphorous acid is the production of phosphonates which are used  in water treatment. Phosphorous acid is also used for preparing phosphite salts, such as potassium phosphite.


2. As a chemical reagent

     Phosphorous acid is used in chemical reactions as a reducing agent that is somewhat less vigorous 

     than the related hypophosphorous acid.


Phosphorous acid is also used as nylon whitener, plastic thermometer, synthetic fiber in plastic industry; as materials for producing weedicide, bactericide and water stabilizer in pesticide industry.


Water Soluble Phosphorous Acid H3PO3 Industrial Agricultural Grade Package


Packing: Net each in 25kg plastic woven bag, lined with PE bag. Or 50kg,500kg and 1000kg as you need

Max loading weight in 1 x 20fcl: 25MT

Also we could supply packing according to the customer's requirement.


Our Services and Advantage


High Qualityadvanced equipments,strict control the quality,Complies with National Standard;

Competitive Price:factory direct sale, make the prices competitive;Cooperate with many big ship companies,can get competitive sea freight.

Rich Experience:Export to many countries;

Packing design:The packing bags is the normal bags,customized designs are also welcome. 



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