NIOSH Pocket Guide to Chemical Hazards

Monocrotophos CAS 6923-22-4
C7H14NO5P RTECS TC4375000
Synonyms & Trade Names
3-Hydroxy-N-methylcrotonamide dimethylphosphate, Monocron
DOT ID & Guide
2783 152 (organophosphorus pesticide, solid)
NIOSH REL: TWA 0.25 mg/m3
OSHA PEL†: none
IDLH N.D. Conversion
Physical Description
Colorless to reddish-brown solid with a mild, ester odor. [insecticide]
MW: 223.2
BP: 257°F
MLT: 129°F
Sol: Miscible
VP: 0.000007 mmHg
IP: ?

Sp.Gr: ?
Fl.P: >200°F
UEL: ?
LEL: ?

Combustible Solid
Incompatibilities & Reactivities
Metals, low molecular weight alcohols & glycols [Note: Corrosive to black iron, drum steel, stainless steel 304 & brass. Should be stored at 70-80°F.]
Measurement Methods
NIOSH 5600; OSHA PV2045
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, miosis, blurred vision; dizziness, convulsions; dyspnea (breathing difficulty); salivation, abdominal cramps, nausea, diarrhea, vomiting; in animals: possible teratogenic effects
Target Organs Eyes, respiratory system, central nervous system, cardiovascular system, blood cholinesterase, reproductive system