NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Methyl demeton

CAS
8022-00-2

C6H15O3PS2

RTECS
TG1760000
Synonyms & Trade Names

Demeton methyl; O,O-Dimethyl 2-ethylmercaptoethyl thiophosphate; Metasystox®; Methyl mercaptophos; Methyl systox®
DOT ID & Guide

Exposure
Limits

NIOSH REL: TWA 0.5 mg/m3 [skin]
OSHA PEL: none
IDLH
N.D. See: IDLH INDEX
Conversion
Physical Description
Oily, colorless to pale-yellow liquid with an unpleasant odor. [insecticide] [Note: Technical grade consists of 2 isomers: thiono & thiolo.]
MW: 230.3
BP: Decomposes
FRZ: ?
Sol: 0.03-0.3%
VP: 0.0004 mmHg
IP: ?

Sp.Gr: 1.20
Fl.P: ?
UEL: ?
LEL: ?

Combustible Liquid
Incompatibilities & Reactivities

Strong oxidizers, alkalis, water
Measurement Methods
None available
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 wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
Not available.
Important additional information about respirator selection
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
Irritation eyes, skin; ache eyes, rhinorrhea (discharge of thin mucus); nausea, headache, dizziness, vomiting
Target Organs
Eyes, skin, respiratory system, central nervous system, cardiovascular system, blood cholinesterase
See also: INTRODUCTION   See ICSC CARD: 0862