International Chemical Safety Cards FENTHION ICSC: 0655 O,O-Dimethyl-O-(4-methylthio-m-tolyl) phosphorothioate Phosphorothioic acid, O,O-dimethyl O-(3-methyl-4-(methylthio)phenyl) ester C10H15O3PS2 / (H3CO)2PSOC6H3(CH3)SCH3 Molecular mass: 278.3 ICSC #    0655 CAS #     55-38-9 RTECS # TF9625000 UN #        3018 EC #         015-048-00-8 September 23, 1993 Peer reviewed 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 STORAGE 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. Separated from food and feedstuffs . Well closed. Keep in a well-ventilated room. Do not transport with food and feedstuffs. Severe marine pollutant. T symbol N symbol R: 21/22-23-48/25-50/53-68 S: 1/2-36/37-45-60-61 UN Hazard Class: 6.1 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 0655 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

International Chemical Safety Cards FENTHION ICSC: 0655 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS LIQUID WHEN PURE. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on heating producing toxic fumes including phosphorus oxides and sulfur oxides . OCCUPATIONAL EXPOSURE LIMITS: TLV: 0.2 mg/m³ as TWA; (skin); A4; (ACGIH 2004). MAK: (Inhalable fraction) 0.2 mg/m³; H; Peak limitation category: II(2); (DFG 2004). OSHA PEL: none NIOSH REL: See Appendix D NIOSH IDLH: No data 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 20°C ; 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 210°C Relative density (water = 1): 1.25 Solubility in water, g/100 ml at 20°C: none Vapour pressure, Pa at 25°C: very low ENVIRONMENTAL DATA This substance may be hazardous to the environment; special attention should be given to birds, fish. N O T E S 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. See sections Occupational Exposure Limits, EU classification, Emergency Response. Transport Emergency Card: TEC (R)-61GT6-III ADDITIONAL INFORMATION ICSC: 0655 FENTHION (C) IPCS, CEC, 1994

IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.