Methyl demeton
Synonyms & Trade Names
Demeton methyl, O,O-Dimethyl 2-ethylmercaptoethyl thiophosphate, Metasystox®, Methyl mercaptophos, Methyl systox®Physical Description
Oily, colorless to pale-yellow liquid with an unpleasant odor. [insecticide] [Note: Technical grade consists of 2 isomers: thiono & thiolo.]Molecular Weight
230.3Boiling Point
DecomposesFreezing Point
?Solubility
0.03-0.3%Vapor Pressure
0.0004 mmHgIonization Potential
?Specific Gravity
1.20Flash Point
?Upper Exposive Limit
?Lower Explosive Limit
?
Combustible Liquid
Incompatibilities & Reactivities
Strong oxidizers, alkalis, waterExposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contactSymptoms
irritation eyes, skin; ache eyes, rhinorrhea (discharge of thin nasal mucus); nausea, headache, dizziness, vomitingTarget Organs
Eyes, skin, respiratory system, central nervous system, cardiovascular system, blood cholinesterasePersonal 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.
- Page last reviewed:April 11, 2016
- Page last updated:April 11, 2016
- Content source:
- National Institute for Occupational Safety and Health (NIOSH) Education and Information Division