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
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