# NIOSH Pocket Guide to Chemical Hazards
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. | 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
Personal Protection & Sanitation 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 To be added later
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