# NIOSH Pocket Guide to Chemical Hazards
Fonofos | CAS 944-22-9
C10H15OPS2 | RTECS TA5950000
Synonyms & Trade Names Dyfonate®, Dyphonate, O-Ethyl-S-phenyl ethylphosphorothioate, Fonophos | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 0.1 mg/m3 [skin]
OSHA PEL†: none
IDLH N.D. | Conversion 1 ppm = 10.07 mg/m3
Physical Description Light-yellow liquid with an aromatic odor. [insecticide]
MW: 246.3 | BP: ? | FRZ: ? | Sol: 0.001%
VP(77°F): 0.0002 mmHg | IP: ? |  | Sp.Gr: 1.15
Fl.P: >201°F | UEL: ? | LEL: ? |
Class IIIB Combustible Liquid: Fl.P. at or above 200°F.
Incompatibilities & Reactivities None reported
Measurement Methods NIOSH 5600; OSHA PV2027
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily Provide: Eyewash, Quick drench | 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, blood cholinesterase
See also: INTRODUCTION