# NIOSH Pocket Guide to Chemical Hazards
Fenthion | CAS 55-38-9
C10H15O3PS | RTECS TF9625000
Synonyms & Trade Names Baytex; Entex; O,O-Dimethyl O-3-methyl-4-methylthiophenyl phosphorothioate | DOT ID & Guide
Exposure Limits | NIOSH REL: See Appendix D
OSHA PEL†: none
IDLH N.D. | Conversion
Physical Description Colorless to brown liquid with a slight, garlic-like odor. [insecticide]
MW: 278.3 | BP: ? | FRZ: 43°F | Sol: 0.006%
VP: 0.0003 mmHg | IP: ? |  | Sp.Gr: 1.25
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Liquid
Incompatibilities & Reactivities Oxidizers
Measurement Methods None available
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 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 Nausea, vomiting, abdominal cramps, diarrhea, salivation; headache, dizziness, lassitude (weakness, exhaustion); rhinorrhea (discharge of thin mucus), chest tightness; blurred vision, miosis; cardiac irregularities; muscle fasciculation; dyspnea (breathing difficulty)
Target Organs respiratory system, central nervous system, cardiovascular system, plasma cholinesterase
See also: INTRODUCTION