NIOSH Pocket Guide to Chemical Hazards

Chlorpyrifos CAS 2921-88-2
C9H11Cl3NO3PS RTECS TF6300000
Synonyms & Trade Names
Chlorpyrifos-ethyl; O,O-Diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate; Dursban®
DOT ID & Guide
2783 152
NIOSH REL: TWA 0.2 mg/m3 ST 0.6 mg/m3 [skin]
OSHA PEL†: none
IDLH N.D. Conversion
Physical Description
Colorless to white, crystalline solid with a mild, mercaptan-like odor. [pesticide] [Note: Commercial formulations may be combined with combustible liquids.]
MW: 350.6
BP: 320°F (Decomposes)
MLT: 108°F
Sol: 0.0002%
VP: 0.00002 mmHg
IP: ?

Sp.Gr: 1.40 (Liquid at 110°F)
Fl.P: ?
UEL: ?
LEL: ?

Combustible Solid
Incompatibilities & Reactivities
Strong acids, caustics, amines [Note: Corrosive to copper & brass.]
Measurement Methods
NIOSH 5600; OSHA 62
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: Soap wash 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 Wheezing, laryngeal spasms, salivation; bluish lips, skin; miosis, blurred vision; nausea, vomiting, abdominal cramps, diarrhea
Target Organs respiratory system, central nervous system, peripheral nervous system, plasma cholinesterase