NIOSH Pocket Guide to Chemical Hazards

Phorate CAS 298-02-2
(C2H5O)2P(S)SCH2SC2H5 RTECS TD9450000
Synonyms & Trade Names
O,O-Diethyl S-(ethylthio)methylphosphorodithioate; O,O-Diethyl S-ethylthiomethylthiothionophosphate; Thimet; Timet
DOT ID & Guide
3018 152 (organophosphorus pesticide, liquid)
NIOSH REL: TWA 0.05 mg/m3 ST 0.2 mg/m3 [skin]
OSHA PEL†: none
IDLH N.D. Conversion
Physical Description
Clear liquid with a skunk-like odor. [insecticide]
MW: 260.4
BP: ?
FRZ: -45°F
Sol: 0.005%
VP: 0.0008 mmHg
IP: ?

Sp.Gr(77°F): 1.16
Fl.P(oc): 320°F
UEL: ?
LEL: ?

Class IIIB Combustible Liquid, but does not readily ignite.
Incompatibilities & Reactivities
Water, alkalis [Note: Hydrolyzed in the presence of moisture and by alkalis.]
Measurement Methods
NIOSH 5600
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation
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 Irritation eyes, skin, respiratory system; miosis; rhinorrhea (discharge of thin mucus); headache; chest tightness, wheezing, laryngeal spasm, salivation, cyanosis; anorexia, nausea, vomiting, abdominal cramps, diarrhea; sweating; muscle fasciculation, lassitude (weakness, exhaustion), paralysis; dizziness, confusion, ataxia; convulsions, coma; low blood pressure; cardiac irregularities
Target Organs Eyes, skin, respiratory system, central nervous system, cardiovascular system, blood cholinesterase