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About Us Location:Home >> Products > Phosphorous Acid     

Phosphorous Acid

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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