International Chemical Safety Cards PARATHION ICSC: 0006 PARATHION O,O-Diethyl-O-(4-nitrophenyl)phosphorothioate Phosphorothioic acid O,O-diethyl O-(4-nitrophenyl)ester Ethyl parathion; thiophos (C2H5O)2PSOC6H4NO2 Molecular mass: 291.27 CAS # 56-38-2 RTECS # TF4550000 ICSC # 0006 UN # 3018 EC # 015-034-00-1 TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Combustible. NO open flames. Powder, water spray, foam, carbon dioxide. EXPLOSION In case of fire: keep drums, etc., cool by spraying with water. EXPOSURE PREVENT GENERATION OF MISTS! STRICT HYGIENE! AVOID EXPOSURE OF ADOLESCENTS AND CHILDREN! IN ALL CASES CONSULT A DOCTOR! INHALATION Convulsions. Diarrhoea. Dizziness. Headache. Laboured breathing. Unconsciousness. Vomiting. Weakness. Pupillary constriction, muscle cramp, excessive salivation. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Artificial respiration if indicated. Refer for medical attention. SKIN MAY BE ABSORBED! (further see Inhalation). Protective gloves. Protective clothing. Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention. EYES VAPOUR WILL BE ABSORBED! Redness. Pain. Blurred vision. 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 (further see Inhalation). Do not eat, drink, or smoke during work. Wash hands before eating. Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Give plenty of water to drink. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Ventilation. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Cautiously neutralize remainder with an alkaline substance (extra personal protection: self-contained breathing apparatus). Fireproof. Separated from strong oxidants. Cool. Dry. Keep locked up. T+ symbol R: 27/28 S: 28-36/37-45 UN Hazard Class: 6.1 SEE IMPORTANT INFORMATION ON BACK ICSC: 0006 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993 No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and IDLH values.

International Chemical Safety Cards PARATHION ICSC: 0006 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: PALE YELLOW TO BROWN (TECHNICAL PRODUCT) LIQUID , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: The vapour is heavier than air and may travel along the ground; distant ignition possible. CHEMICAL DANGERS: The substance decomposes on heating producing toxic gases including carbon monoxide, sulfur oxides, phosphorous oxides, nitrogen oxides. Reacts with strong oxidants. Attacks some forms of plastics, rubber and coatings. Rapidly hydrolysed by alkalis. OCCUPATIONAL EXPOSURE LIMITS (OELs): TLV: ppm; 0.1 mg/m3 (skin) (ACGIH 1992-1993). PDK: 0.05 mg/m3 P (USSR 1987). OSHA PEL: TWA 0.1 mg/m3 skin NIOSH REL: TWA 0.05 mg/m3 skin NIOSH IDLH: 10 mg/m3 ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its aerosol, through the skin, by ingestion and through the eyes. 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 irritates the eyes, the skin and the respiratory tract. The substance may cause effects on the nervous system , resulting in convulsions, respiratory failure, muscle weakness. Cholinesterase inhibitor. Exposure may result in death. 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 Boiling point: 375°C Melting point: 6°C Relative density (water = 1): 1.26 Solubility in water, ml/100 ml at 25°C: 0.0024 Vapour pressure, Pa at 20°C: 0.005 Relative vapour density (air = 1): 10 Flash point: 120-160°C ENVIRONMENTAL DATA N O T E S Technical grade may contain flammable impurities. Depending on the degree of exposure, periodic medical examination is indicated. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available. Carrier solvents used in commercial formulations may change physical and toxicological properties. The odour warning when the exposure limit value is exceeded is insufficient. Do NOT take working clothes home. Transport Emergency Card: TEC (R)-755a NFPA Code: H4; F1; R0; ADDITIONAL INFORMATION ICSC: 0006 PARATHION © IPCS, CEC, 1993

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 IDLH values.