# 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
Exposure Limits | 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
See also: INTRODUCTION