International Chemical Safety Cards 1,3-DIMETHYLUREA ICSC: 1745 N,N'-Dimethylurea sym-Dimethylurea N,N'-Dimethylharnstoff (CH3NH)2CO/C3H8N20 Molecular mass: 88.1 ICSC #    1745 CAS #     96-31-1 RTECS # YS9868000 November 24, 2009 Validated De, GHS rechecked TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Combustible. Gives off irritating or toxic fumes (or gases) in a fire. 29, 30, 31, 32 NO open flames. Carbon dioxide, water spray. EXPLOSION Finely dispersed particles form explosive mixtures in air. EXPOSURE PREVENT DISPERSION OF DUST!  •INHALATION Cough. Local exhaust. Fresh air, rest.  •SKIN Redness. Protective gloves. Rinse and then wash skin with water and soap.  •EYES Redness. Safety goggles Rinse with plenty of water (remove contact lenses if easily possible).  •INGESTION Do not eat, drink, or smoke during work. Rinse mouth. Give one or two glasses of water to drink. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Personal protection: particulate filter adapted to the airborne concentration of the substance. Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water. 8-270°C, 26, 31 °C and flash point=154°C, but substance is solid Signal: Warning Causes mild skin irritation Causes eye irritation SEE IMPORTANT INFORMATION ON BACK ICSC: 1745 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 1,3-DIMETHYLUREA ICSC: 1745 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS TO WHITE CRYSTALLINE POWDER. PHYSICAL DANGERS: Dust explosion possible if in powder or granular form, mixed with air. CHEMICAL DANGERS: The substance decomposes on heating producing nitrogen oxides. The solution in water is a weak base. Reacts with strong reducing agents causing fire hazard. 31; pH=9-9.5; ammable gases (CAMEO) OCCUPATIONAL EXPOSURE LIMITS: TLV not established. MAK not established. ROUTES OF EXPOSURE: INHALATION RISK: No indication can be given about the rate in which a harmful concentration of this substance in the air is reached. EFFECTS OF SHORT-TERM EXPOSURE: The substance is mildly irritating to the eyes and the skin. iluted in water EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: 268-270°C Melting point: 102-107°C Density: 1.1 g/cm³ Solubility in water, g/100 ml at 21.5°C: 76.5 (good) Vapour pressure, Pa at 20°C: 0.042 Flash point: 154°C Auto-ignition temperature: 400°C Octanol/water partition coefficient as log Pow: -0.78 ENVIRONMENTAL DATA N O T E S ADDITIONAL INFORMATION ICSC: 1745 1,3-DIMETHYLUREA (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.