NIOSH Pocket Guide to Chemical Hazards

Temephos CAS 3383-96-8
S[C6H4OP(S)(OCH3)2]2 RTECS TF6890000
Synonyms & Trade Names
Abate®; Temefos; O,O,O'O'-Tetramethyl O,O'-thiodi-p-phenylene phosphorothioate
DOT ID & Guide
NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
OSHA PEL†: TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
IDLH N.D. Conversion
Physical Description
White, crystalline solid or liquid (above 87°F). [insecticide] [Note: Technical grade is a viscous, brown liquid.]
MW: 466.5
BP: 248-257°F (Decomposes)
MLT: 87°F
Sol: Insoluble
VP(77°F): 0.00000007 mmHg
IP: ?

Sp.Gr: 1.32
Fl.P: ?
UEL: ?
LEL: ?

Combustible Solid
Incompatibilities & Reactivities
None reported
Measurement Methods
NIOSH 0500, 0600; OSHA PV2056
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily

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, blurred vision; dizziness; dyspnea (breathing difficulty); salivation; abdominal cramps, nausea, diarrhea, vomiting
Target Organs Eyes, respiratory system, central nervous system, cardiovascular system, blood cholinesterase