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DEMETON-METHYL
ICSC: 0862
Peer-Review Status: 03.11.2001 Validated
S-2-Ethylthioethyl O,O-dimethyl phosphorothioate
S (and O)-2-Ethylthioethyl O,O-dimethyl phosphorothioate 
CAS #: 8022-00-2 RTECS #: TG1760000
UN #: 3018
EC #: 015-031-00-5
EINECS #: 213-052-6
    Formula: C6H15O3PS2
Molecular mass: 230.3

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Combustible. Liquid formulations containing organic solvents may be flammable. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames.  Use water spray, powder, foam, carbon dioxide. 
EXPLOSION      
 
EXPOSURE   PREVENT GENERATION OF MISTS! STRICT HYGIENE! AVOID EXPOSURE OF ADOLESCENTS AND CHILDREN!  IN ALL CASES CONSULT A DOCTOR! 
Inhalation Convulsions. Dizziness. Laboured breathing. Nausea. Pupillary constriction, muscle cramp, excessive salivation. Sweating. Unconciousness.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin MAY BE ABSORBED! See Inhalation.  Protective clothing. Protective gloves.  Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention . 
Eyes Pupillary constriction. Blurred vision.  Wear face shield or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion See Inhalation. Abdominal cramps. Diarrhoea. Vomiting.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations.  Do not transport with food and feedstuffs. 
EC Classification
Symbol: T, N; R: 24/25-51/53; S: (1/2)-28-36/37-45-61 
UN Classification
UN Hazard Class: 6.1; UN Pack Group: III 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-61G43B.  Keep in a well-ventilated room. Separated from food and feedstuffs. Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS-TO-PALE YELLOW OILY LIQUID WITH CHARACTERISTIC ODOUR. 

Physical dangers
 

Chemical dangers
Decomposes on burning. This produces phosphorous oxides and sulfur oxides. 

Occupational exposure limits
TLV (inhalable vapor and aerosol): 0.05mg/m³ as TWA; (skin); BEI issued; (ACGIH 2008).
MAK: 0.5 ppm, 4.8 mg/m³; Peak limitation category: II(2); Skin absorption (H); (DFG 2008). 

Routes of exposure
The substance can be absorbed into the body by inhalation, through the skin and by ingestion. 

Inhalation risk
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly on spraying. 

Effects of short-term exposure
The substance may cause effects on the central nervous system. Cholinesterase inhibition. Medical observation is indicated. The effects may be delayed. Exposure could cause death. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Relative density (water = 1): 1.2
Solubility in water, g/100ml at 20°C: 2.2
Vapour pressure, Pa at 20°C: 0.04
Octanol/water partition coefficient as log Pow: 1.32  
The substance is toxic to aquatic organisms. This substance may be hazardous to the environment. Special attention should be given to bees, mammals and birds. Avoid release to the environment in circumstances different to normal use. 

NOTES
Demeton-methyl is a mixture of Demeton-S-methyl and Demeton-O-methyl.
If the substance is formulated with solvent(s) also consult the card(s) (ICSC) of the solvent(s).
Carrier solvents used in commercial formulations may change physical and toxicological properties.
Also consult ICSC 0429 Demeton-O-methyl, ICSC 0705 Demeton-S-methyl.
Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available.
Depending on the degree of exposure, periodic medical examination is indicated.
Metasystox is a trade name.
Card has been partially updated in November 2008: see 24901000\Occupational Exposure Limits, 24909500\Storage. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations