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FENTHION ICSC: 0655
Date of Peer Review: September 1993

O,O-Dimethyl-O-(4-methylthio-m-tolyl) phosphorothioate
Phosphorothioic acid, O,O-dimethyl O-(3-methyl-4-(methylthio)phenyl) ester
CAS # 55-38-9 C10H15O3PS2 / (H3CO)2PSOC6H3(CH3)SCH3
RTECS # TF9625000 Molecular mass: 278.3
UN # 3018
EC Index # 015-048-00-8
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Not combustible. Liquid formulations containing organic solvents may be flammable. Gives off irritating or toxic fumes (or gases) in a fire.

In case of fire in the surroundings: use appropriate extinguishing media.
EXPLOSION


EXPOSURE
PREVENT GENERATION OF MISTS!

Inhalation Convulsions. Dizziness. Laboured breathing. Nausea. Unconsciousness. Vomiting. Pupillary constriction, muscle cramp, excessive salivation.
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention.
Skin MAY BE ABSORBED! Pupillary constriction. (Further see Inhalation).
Protective gloves. Protective clothing.
Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention.
Eyes
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 take to a doctor.
Ingestion Abdominal cramps. Diarrhoea. Nausea. Vomiting. Pupillary constriction, muscle cramps, excessive salivation. (Further see Inhalation).
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
Collect leaking liquid in sealable containers. Absorb remaining liquid in dry sand or inert absorbent and remove to safe place. Do NOT wash away into sewer. Do NOT let this chemical enter the environment. Personal protection: P3 filter respirator for toxic particles.
Do not transport with food and feedstuffs. Severe marine pollutant.
EU Classification
Symbol: T, N
R: 21/22-23-48/25-50/53-68
S: (1/2-)-36/37-45-60-61
UN Classification
UN Hazard Class: 6.1
UN Pack Group: III
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-61GT6-III
Separated from food and feedstuffs. Well closed. Keep in a well-ventilated room.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2005

SEE IMPORTANT INFORMATION ON BACK
FENTHION ICSC: 0655
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID WHEN PURE.

CHEMICAL DANGERS:
The substance decomposes on heating producing toxic fumes including phosphorus oxides and sulfur oxides.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 0.2 mg/m as TWA; (skin); A4 (not classifiable as a human carcinogen); BEI issued; Intended change; (ACGIH 2004).
MAK: (Inhalable fraction) 0.2 mg/m; Peak limitation category: II(2); skin absorption (H); (DFG 2004).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion.

INHALATION RISK:
A harmful contamination of the air will not or will only very slowly be reached on evaporation of this substance at 20C; on spraying or dispersing, however, much faster.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance may cause effects on the nervous system, resulting in convulsions, respiratory failure. Cholinesterase inhibitor. The effects may be delayed. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Cholinesterase inhibitor; cumulative effect is possible: see acute hazards/symptoms.
PHYSICAL PROPERTIES
Decomposes below boiling point at 210C
Relative density (water = 1): 1.25
Solubility in water, g/100 ml at 20C: none
Vapour pressure, Pa at 25C: very low
ENVIRONMENTAL DATA
This substance may be hazardous to the environment; special attention should be given to birds, fish.
NOTES
The technical grade (95-98% pure) is a yellow to brown oil with a weak garlic-like odour. Carrier solvents used in commercial formulations may change physical and toxicological properties. Do NOT take working clothes home. Baycid, Baytex, Entex, Lebaycid, Mercaptophos, Queletox and Tiguvon are trade names.
Card has been partly updated in October 2004 and 2005. See sections Occupational Exposure Limits, EU classification, Emergency Response.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2005