Agent Name

Methylphosphonyl difluoride

CAS Number

676-99-3

Formula

C-H3-F2-O-P

Major Category

Toxic Gases & Vapors

Synonyms

DF; Difluoro; Difluoromethylphosphine oxide; Methyl difluorophosphite; Methylphosphonic difluoride; Methylphosphonyldifluoride; Phosphonodifluoridic acid, methyl-; Phosphonic difluoride, P-methyl-; Phosphonic difluoride, methyl-; [ChemIDplus] Agent DF; Difluor; [HSDB]

Category

Chemical Weapons

Description

Liquid with a pungent acrid odor; [HSDB]

Sources/Uses

Used to make 'G' series nerve agents (i.e. sarin and soman) and as a component of GB2 (binary nerve agent); [HSDB]

Comments

Causes cyanosis, dehydration, other changes in olfaction, aggression, dyspnea, muscle weakness, and ataxia in acute inhalation studies of mammals; [RTECS] See "Methylphosphonofluoridic acid." See "Phosphonic difluoride."

Exposure Assessment
Vapor Pressure

36 mm Hg

Lethal Concentration

LCLo (rat) = 1,842 mg/m3/30min

Links to Other NLM Databases
Health Studies

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Toxicity Information

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