NIOSH logo and tagline

Methyl demeton

Related Pages
Synonyms & Trade Names
Demeton methyl, O,O-Dimethyl 2-ethylmercaptoethyl thiophosphate, Metasystox®, Methyl mercaptophos, Methyl systox®
CAS No.
8022-00-2
RTECS No.
TG1760000
DOT ID & Guide
Formula
C₆H₁₅O₃PS₂
Conversion
IDLH
N.D.
See: IDLH INDEX
Exposure Limits
NIOSH REL
TWA 0.5 mg/m3 [skin]
OSHA PEL
none See Appendix G
Measurement Methods
None available
See: NMAM or OSHA Methods
Physical Description
Oily, colorless to pale-yellow liquid with an unpleasant odor. [insecticide] [Note: Technical grade consists of 2 isomers: thiono & thiolo.]
Molecular Weight
230.3
Boiling Point
Decomposes
Freezing Point
?
Solubility
0.03-0.3%
Vapor Pressure
0.0004 mmHg
Ionization Potential
?
Specific Gravity
1.20
Flash Point
?
Upper Explosive Limit
?
Lower Explosive Limit
?
Combustible Liquid
Incompatibilities & Reactivities
Strong oxidizers, alkalis, water
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin; ache eyes, rhinorrhea (discharge of thin nasal mucus); nausea, headache, dizziness, vomiting
Target Organs
Eyes, skin, respiratory system, central nervous system, cardiovascular system, blood cholinesterase
Personal Protection/Sanitation
(See protection codes)
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

See also
INTRODUCTION   ICSC CARD: 0862
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health