NIOSH Pocket Guide to Chemical Hazards


CAS 298-04-4


RTECS TD9275000
Synonyms & Trade Names
O,O-Diethyl S-2-(ethylthio)-ethyl phosphorodithioate; Di-Syston®; Thiodemeton
DOT ID & Guide
2783 152


NIOSH REL: TWA 0.1 mg/m3 [skin]
OSHA PEL†: none
IDLH N.D. See: IDLH INDEX Conversion
Physical Description
Oily, colorless to yellow liquid with a characteristic, sulfur odor. [insecticide] [Note: Technical product is a brown liquid.]
MW: 274.4
BP: ?
FRZ: >-13°F
Sol(73°F): 0.003%
VP: 0.0002 mmHg
IP: ?

Sp.Gr: 1.14
Fl.P: >180°F
UEL: ?
LEL: ?

Combustible Liquid, but will not ignite easily.
Incompatibilities & Reactivities
Measurement Methods
NIOSH 5600
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
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
Important additional information about respirator selection
Respirator Recommendations Not available.
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); eye, skin burns
Target Organs Eyes, skin, respiratory system, central nervous system, cardiovascular system, blood cholinesterase