# 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
Exposure Limits | 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
See also: INTRODUCTION