NIOSH Pocket Guide to Chemical Hazards

Ethion CAS 563-12-2
[(C2H5O)2P(S)S]2CH2 RTECS TE4550000
Synonyms & Trade Names
O,O,O',O'-Tetraethyl S,S'-methylene di(phosphorodithioate)
DOT ID & Guide
2783 152
NIOSH REL: 0.4 mg/m3 [skin]
OSHA PEL†: none
IDLH N.D. Conversion
Physical Description
Colorless to amber-colored, odorless liquid. [insecticide] [Note: A solid below 10°F. The technical product has a very disagreeable odor.]
MW: 384.5
BP: >302°F (Decomposes)
FRZ: 10°F
Sol: 0.0001%
VP: 0.0000015 mmHg
IP: ?

Sp.Gr: 1.22
Fl.P: 349°F
UEL: ?
LEL: ?

Class IIIB Combustible Liquid: Fl.P. at or above 200°F.
Incompatibilities & Reactivities
Acids, 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: Daily
Provide: Eyewash, Quick drench
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 Irritation eyes, skin; 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 Eyes, skin, respiratory system, central nervous system, cardiovascular system, blood cholinesterase