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Phosphorous acid H3PO3 99% Colorless crystal

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CAS No.:

13598-36-2

Grade:

Industrial Grade

Content:

99%

Port:

the port of Qingdao

Packaging:

25kg/bag

Price valid (until):

2023-04-30

Contact Supplier

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Shandong Lingnuo chemical Co., Ltd

Company Type:

Trader

Location:

China

Qualification:

Main Products:

Melamine,ethyl acetate,maleic anhydride,acetic acid,tetrahydrofuran,butyl acetate

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Product Description
Seller Information
Inquiry History

Description

Phosphorous acid (H3PO3)

Phosphite, a kind of inorganic compound, chemical formula H3PO3, is white crystalline powder, easy to dissolve in water, ethanol, in the air slowly oxidation into orthophosphate, heated to 180℃ decomposition into orthophosphate and phosphine, mainly used as a raw material for the manufacture of plastic stabilizer, but also used in synthetic fibers and phosphite manufacturing.

It is a raw material for the manufacture of phosphite, as well as for the manufacture of plastic stabilizers (such as lead disalt phosphate) and organophosphorus pesticide.but also in the manufacture of synthetic fibers and phosphite.s. Used as a stabilizer for polycarbonate. Also used as an antioxidant in nylon 1010.

Items	Specifications
CAS	13598-36-2
chemical formula	H3O3P
molecular weight	82
density	1.651g/mLat 25°C(lit.)
melting point	73 °C
boiling point	200 °C
flash(ing) point	200°C
water solubility	SOLUBLE
vapour pressure	0.001Pa at 20℃
acidity coefficient	pK1 1.29; pK2 6.74(at 25℃)
storage condition	0-6°C
stability	Stable. Incompatible with strong bases. Hygroscopic.
sensibility	Air Sensitive & Hygroscopic
appearance	Crystals
proportion	1.651
colour	White
physico-chemical property	Achromatic crystals. Soluble in water and alcohol.
product use	It is a raw material for the manufacture of phosphite, as well as for the manufacture of plastic stabilizers (such as lead disalt phosphate) and organophosphorus pesticide.but also in the manufacture of synthetic fibers and phosphite.s. Used as a stabilizer for polycarbonate. Also used as an antioxidant in nylon 1010.
security	Belongs to the second class inorganic acid corrosion articles, danger code number: GB 8.1 Class 81520. UNN0.2854; IMDG CODE 8205 page, Class 8.1. Store in a cool, ventilated and dry storeroom. The package is sealed. It is strictly prohibited to put it upside down under moisture. It is not allowed to be stored and transported together with alkali, toxic, H porous agent and other corrosion-prone articles. Transportation should be rain and sun protection; Marine transport cannot be placed on deck. Handle with care during loading and unloading. Do not roll or turn upside down to prevent packing damage. Three plywood drums for export packing, lined with two layers of polyethylene plastic bags, each net weight 50kg. Polyethylene plastic drum for domestic packaging, net weight of 30kg per barrel. Or iron drums lined with two layers of polyethylene plastic bags, each net weight 25kg. The packaging should be clearly marked "corrosive goods". Fire, available sand, dry powder out Firearm rescue. Toxicity and protection: see industrial phosphoric acid.

Basic Info

Product Name:

Phosphonic acid

Other Name:

Phosphonic acid;Phosphorous acid;Dihydroxyphosphine oxide;1135443-40-1

CAS No.:

13598-36-2

UN No.:

2834

Molecular Formula:

H3O3P

InChIKeys:

InChIKey=ABLZXFCXXLZCGV-UHFFFAOYSA-N

Molecular Weight:

81.99580

Exact Mass:

82.00

EC Number:

233-663-1

UNII:

95E079716M

UN Number:

2834

DSSTox ID:

DTXSID7035511

HScode:

2811199090

Categories:

Inorganic Acid

Characteristics

PSA:

81.00000

XLogP3:

-0.63930

Appearance:

Phosphorous acid appears as a white or yellow crystalline solid (melting point 70.1 deg C) or a solution of the solid. Density 1.651 g /cm3 . Contact may severely irritate skin, eyes, and mucous membranes. Toxic by ingestion, inhalation and skin absorption.

Density:

1.651

Melting Point:

73 °C (approx)

Boiling Point:

200ºC

Flash Point:

200ºC

Water Solubility:

H2O: soluble

Storage Conditions:

0-6ºC

Air and Water Reactions:

Deliquescent. Absorbs oxygen from the air very readily to form phosphoric acid [Hawley]. Soluble in water.

Reactive Group:

Acids, Weak

Reactivity Profile:

PHOSPHOROUS ACID decomposes when heated to form phosphine, a gas that usually ignites spontaneously in air. Absorbs oxygen from the air to form phosphoric acid [Hawley]. Forms yellow deposits in aqueous solution that are spontaneously flammable upon drying. Reacts exothermically with chemical bases (for example: amines and inorganic hydroxides) to form salts. These reactions can generate dangerously large amounts of heat in small spaces. Dissolution in water or dilution of a concentrated solution with additional water may generate significant heat. Reacts in the presence of moisture with active metals, including such structural metals as aluminum and iron, to release hydrogen, a flammable gas. Can initiate the polymerization of certain alkenes. Reacts with cyanide compounds to release gaseous hydrogen cyanide. May generate flammable and/or toxic gases in contact with dithiocarbamates, isocyanates, mercaptans, nitrides, nitriles, sulfides, and strong reducing agents. Additional gas-generating reactions occur with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (to give SO2), and carbonates (to give CO2).

See More Phosphonic acid Properties 

Hazard Identification

Classification of the substance or mixture

Acute toxicity - Category 4, Oral

Skin corrosion, Sub-category 1A

GHS label elements, including precautionary statements

Precautionary statement(s)
Pictogram(s)
Signal word	Danger
Hazard statement(s)	H302 Harmful if swallowed H314 Causes severe skin burns and eye damage
Prevention	P264 Wash ... thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P280 Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/...
Response	P301+P317 IF SWALLOWED: Get medical help. P330 Rinse mouth. P301+P330+P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. P363 Wash contaminated clothing before reuse. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P316 Get emergency medical help immediately. P321 Specific treatment (see ... on this label). P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Storage	P405 Store locked up.
Disposal	P501 Dispose of contents/container to an appropriate treatment and disposal facility in accordance with applicable laws and regulations, and product characteristics at time of disposal.

Other hazards which do not result in classification

no data available

Handling and Storage

Precautions for safe handling

Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.

Conditions for safe storage, including any incompatibilities

Store the container tightly closed in a dry, cool and well-ventilated place. Store apart from foodstuff containers or incompatible materials.

See More Phosphonic acid Safety Data Sheet 

Seller Information

Business Type:
Trader

Main Products:
Melamine,ethyl acetate,maleic anhydride,acetic acid,tetrahydrofuran,butyl acetate

Location:
Room 21-1, 14th floor, Zone (A), Guangrao City Commercial Complex, Quanfu Yuan, Guangrao County, Dongying City, Shandong Province

Payment Terms:
TT against copy of documents,L/C

Average lead Time:
20

Total Annual Revenue:
$50 million-$100 million

Total Employees:
51-100

Year of Establishment:
2018

Shandong Lingnuo chemical Co.,Ltd is located in Dongying City, Shandong Province, export more than ten years It is mainly exported to Africa, Asia,Middle East,South America , mainly delaing with product tetrahydrofuran, Melamine, Methylene chloride, aniline oil, Dimethyl Formamide,Acetic acid, Isopropyl Alcohol, Maleic anhydride,Methyl Acetate,DMSO, Ethanol and so on.

Inquiry History

9 Inquiries

Country	Product	Purchase Quantity	Date Posted
Australia	Hypophosphurous acid	100 G	Mar 7, 2026
Russia	Phosphorous acid Industrial Grade best selling	210 MT	Jun 25, 2026
Philippines	Phosphorous Acid H3PO3 98.5% 99.0% Crystal Powder	50 KG	Jun 11, 2026
Egypt	Phosphorous Acid 98.5%	5 TON	Dec 9, 2024
India	Phosphorous Acid	1000.00 KG	Jul 29, 2024
United States	Phosphonic acid	1 KG	Aug 12, 2025
Poland	Phosphorous acid crystal powder [H3PO3]	100 KG	May 13, 2025
India	Phosphorous Acid	500.00 KG	Jul 9, 2024
India	Phosphonic acid	20 MT	Nov 1, 2023

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