99% Phosphorous acid H3PO3

99% Phosphorous acid H3PO3

Quick Details

Classification: Phosphorous Acid
CAS No.: 13598-36-2
Other Names: Phosphonic acid
EINECS No.: 13598-36-2
Grade Standard: Industrial Grade
Purity: 99% Min, 99%
Appearance: White Powder, Colorless transparent liquid
Application: Plastic stabilizer
Product name: Phosphorous acid
Color: White
Melting Point: 73℃
Storage conditions: 0-6°C
density: 1.651 g/mL at 25 °C(lit.)
Boiling Point: 200℃
flash point: 200℃
CAS: 13598-36-2

Product introduction

Chinese name phosphorous acid
Foreign Name Phosphorous acid
English name
Molecular formula H3PO3
Molecular weight: 82.00
Appearance colorless crystal
CAS: 13598-36-2
Storage: Store in a cool, ventilated warehouse

Characteristic and superiority

Phosphorous acid, inorganic compounds, soluble in water and alcohol. In the air slowly oxidized to orthophosphoric acid, heated to 180 ° C when the decomposition of orthophosphoric acid and phosphine (highly toxic, explosive). Phosphoric acid is a dibasic acid, its acidity is slightly stronger than phosphoric acid, it has a strong reduction, easy to silver ions (Ag +) reduced to metallic silver (Ag), sulfuric acid can be reduced to sulfur dioxide. Strong hygroscopicity and deliquescence, corrosive. Phosphoric acid is mainly used as a reducing agent, nylon whitening agent, As a raw material for the manufacture of plastic stabilizers, it is also used in the production of synthetic fibers and phosphites.


1, used as a reducing agent, nylon whitening agent, also used as phosphite raw materials, pesticide intermediates,
2, is the manufacture of phosphite raw materials, but also the manufacture of plastic stabilizers (such as: salt) and organophosphorus pesticide raw materials. Used as a stabilizer for polycarbonate. Also used as antioxidant for nylon 1010.
3, used as chemical reagents,
4, water treatment
5, determination of mercury, gold, silver and lead, reducing agent, test iodic acid, copper and cadmium. Industrial phosphorous acid is the raw material for making plastic stabilizers. Also used in synthetic fibers and phosphites.
6, as the manufacture of plastic stabilizer raw materials, but also for synthetic fibers and phosphite manufacturing

product properties

appearancewhite powder
boiling point200°C
Melting point73℃
density1.651 g/mL at 25 °C(lit.)
SolubilitySoluble in water, ethanol
Relative density (water = 1)1.65(20℃)
flash point200° C

Emergency treatment

1, skin contact: immediately remove the contaminated clothing, rinse with plenty of water for at least 15 minutes. Medical treatment. ,
2, eye contact: immediately lift the eyelid, with a large number of mobile water or saline thoroughly rinse for at least 15 minutes. Medical treatment.
3, inhalation: quickly from the scene to the fresh air. Keep the airway open. If breathing is difficult, give oxygen. Such as breathing to stop, immediately artificial respiration. Medical treatment. ,
4, ingestion: mouthwash with water, drink milk or egg white. Medical treatment.
5, leakage emergency treatment
Emergency treatment: isolation of contaminated areas, restricted access. Recommended emergency personnel wearing a dust mask (full cover), wear anti-acid work clothes. Do not touch the spill directly.
(1) a small amount of leakage: with a clean shovel collected in a dry, clean, covered containers. You can also use a lot of water rinse, diluted with water into the wastewater system.
(2) a large number of leaks: collected or transported to the disposal of waste disposal sites.