Phosphorous Acid,H3PO3,Phosphorous Acid,HUTONG GLOBAL CO.,LTD

Phosphorous Acid

Item : H3PO3

Details :

Phosphorous Acid 99% Powder
Phosphorous Acid 70% liquid

Molecular Formula: H₃PO₃
Molecular Weight: 82.00
CAS No.: 13598-36-2
UN No.: 2834

Properties
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
Boiling Point: 200 °C (Decomposes)
Solubility: Easily soluble in water and alcohol.

Specification of Phosphorous Acid 99% powder

Specification	A Grade	B Grade
Main Content (based on H₃PO₃ ) (%)	≥ 99.0	≥ 99.0
Iron Content (based on Fe) (%)	≤ 0.001	≤ 0.003
Chloride Content (based on CL) (%)	≤ 0.01	≤ 0.02
Sulfate Content (based on SO₄) (%)	≤ 0.008	≤ 0.01
Phosphate Content (based on PO₄) (%)	≤ 0.2	≤ 0.6
Appearance	Pure white crystal	White crystal
70% Aqueous Solution Test	Colorless transparent	Colorless transparent, without impurities

Specification of Phosphorous Acid liquid 70%

ITEM

INDEX

TESTING RESULT

Assay (based on H₃PO₃ ) (%)

≥ 70.0

72

Iron (Fe) (%)

≤0.0003

0.0002

Chloride Content (based on CL) (%)

≤ 0.0005

0.0002

Sulfate Content (based on SO₄) (%)

≤ 0.0003

0.0003

Phosphate Content (based on PO₄) (%)

≤ 0.1

0.07

Pb (%)

≤ 0.0001

0.0001

Cd (%)

≤ 0.0001

0.00008

Color (APHA)

≤10

6

FTU

≤1

1

Applications
Phosphorous acid is mainly used in the production of phosphates, synthetic fibers and organophosphorus pesticides, etc.. It is also used in producing high performance water treating agent ATMP.

Packaging
25kg / 500kg / 1000kg in woven bag lined with double layer polythene bag.
The packaging should be marked with "CORROSIVE"sign.

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