Agent Name

Hypophosphorous acid

CAS Number

6303-21-5

Formula

H3-O2-P

Major Category

Toxic Gases & Vapors

Synonyms

Hypophosphorous acid (VAN); Hypophosphorus acid; Phosphine oxide, hydroxy-; Phosphonous acid (VAN); Phosphinic acid; [ChemIDplus] UN3264

Category

Acids, Inorganic

Description

Deliquescent solid (from the water-free acid); Supercools to colorless odorless liquid; mp = 26.5 deg C; [Merck Index] Colorless odorless solution; [MSDSonline]

Sources/Uses

Used to make hypophosphites and in electroplating baths; [Hawley]

Comments

A strong reducing agent; [Merck Index] Fire and explosion hazard in contact with oxidizing agents; [Hawley] A strong reducing agent; May cause irritation or burns to skin, eye, and respiratory tract; [CAMEO] Corrosive to skin and eyes; [eChemPortal: ERMA] A corrosive substance that can cause injury to the skin, eyes, and respiratory tract; Inhalation may cause chemical pneumonitis; [MSDSonline]

Exposure Assessment
Explanatory Notes

The Guide in the Emergency Response Guidebook is for "Corrosive liquid, acidic, inorganic, n.o.s."

Adverse Effects
Toxic Pneumonitis

Yes

Dermatotoxin

Skin Burns

Links to Other NLM Databases
Toxicity Information

Search TOXNET

Chemical Information

Search ChemIDplus

Related Information in HazMap
Processes

Industrial Processes with risk of exposure: