International Chemical Safety Cards METRIBUZIN ICSC: 0516 4-Amino-6-tert-butyl-3-methylthio-as-triazin-5-one 4-Amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one C8H14N4OS Molecular mass: 214.3 ICSC #    0516 CAS #     21087-64-9 RTECS # XZ2990000 UN #        3077 EC #         606-034-00-8 March 23, 1998 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Combustible. NO open flames. Water spray, powder. EXPLOSION EXPOSURE PREVENT DISPERSION OF DUST!  •INHALATION Ventilation (not if powder), local exhaust, or breathing protection. Fresh air, rest.  •SKIN Protective gloves. Rinse and then wash skin with water and soap.  •EYES Safety spectacles. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.  •INGESTION Do not eat, drink, or smoke during work. Wash hands before eating. Rinse mouth. Rest. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Do NOT let this chemical enter the environment. Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Then remove to safe place. Store in an area without drain or sewer access. Xn symbol N symbol R: 22-50/53 S: (2)-60-61 UN Hazard Class: 9 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 0516 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 METRIBUZIN ICSC: 0516 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS TO WHITE CRYSTALS , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on burning producing toxic fumes including nitrogen oxides and sulfur oxides . OCCUPATIONAL EXPOSURE LIMITS: TLV: 5 mg/m³ as TWA; A4 (not classifiable as a human carcinogen); (ACGIH 2005). MAK not established. OSHA PEL: none NIOSH REL: TWA 5 mg/m3 NIOSH IDLH: No data ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its aerosol and by ingestion. INHALATION RISK: Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly. EFFECTS OF SHORT-TERM EXPOSURE: Exposure at high levels may result in depression of the central nervous system. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Melting point: 125°C Density: 1.28 g/cm3 Solubility in water, g/100 ml at 20°C: 0.12 Vapour pressure, Pa at 20°C: <1 Octanol/water partition coefficient as log Pow: 1.6 ENVIRONMENTAL DATA The substance is harmful to aquatic organisms. This substance does enter the environment under normal use. Great care, however, should be given to avoid any additional release, e.g. through inappropriate disposal. N O T E S Bay 61597, Bay DIC 1468, Bayer 94337, Bayer 6159H, Bayer 6443H, DIC 1468, Lexone, Sencor, Sencoral, Sencorer, and Sencorex are trade names. Transport Emergency Card: TEC (R)-90GM7-III ADDITIONAL INFORMATION ICSC: 0516 METRIBUZIN (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.