Toxic Gases & Vapors
Hypophosphorous acid (VAN); Hypophosphorus acid; Phosphine oxide, hydroxy-; Phosphonous acid (VAN); Phosphinic acid; [ChemIDplus] UN3264
Deliquescent solid (from the water-free acid); Supercools to colorless odorless liquid; mp = 26.5 deg C; [Merck Index] Colorless odorless solution; [MSDSonline]
Used to make hypophosphites and in electroplating baths; [Hawley]
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]
The Guide in the Emergency Response Guidebook is for "Corrosive liquid, acidic, inorganic, n.o.s."
Industrial Processes with risk of exposure: