Molecular Formula：H3PO3
Molecular Weight: 82.00
CAS Number: 13598-36-2

EINECS NO.:237-066-7

Properties
Phosphorous acid is a colorless crystal, relative Density: 1.651 (21.1 °C);
melting Point: 73.6 °C; moiling Point: 200 °C (Decomposes); easily soluble in
water and alcohol.
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 stronger acidity than phosphoric acid. Phosphorous
acid has strong reducibility and can easily reduce Ag+ to metal silver. It can
also reduce sulfuric acid to sulfur dioxide. It is hygroscopic and has strong
hygroscopy.
Specification
Item Classy article Grade A
Appearance White Crystal
Main Content (As H3PO3) (%) ≥ 99.0 98.5
Iron Content (As Fe) (%) ≤ 0.001 0.005
Chloride Content (As CL) (%) ≤ 0.001 0.005
Sulfate Content (As SO4) (%) ≤ 0.008 0.01
Phosphate Content (As PO4) (%) ≤ 0.2 0.6
80%Liquid Phosphorous Acid (%) Colorless transparent liquid

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
Net 25kg, 500kg or 1000kg in woven bag lined with double layers of polythene
bag".