International Chemical Safety Cards 1,2-DINITROBENZENE ICSC: 0460 1,2-DINITROBENZENE 1,2-Dinitrobenzol o-Dinitrobenzene 1,2-DNB C6H4(NO2)2/C6H4N2O4 Molecular mass: 168.1 CAS # 528-29-0 RTECS # CZ7450000 ICSC # 0460 UN # 1597 EC # 609-004-00-2 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. NO open flames. Powder, water spray, foam, carbon dioxide. EXPLOSION Finely dispersed particles form explosive mixtures in air. Prevent deposition of dust; closed system, dust explosion-proof electrical equipment and lighting. In case of fire: keep drums, etc., cool by spraying with water. Combat fire from a sheltered position. EXPOSURE PREVENT DISPERSION OF DUST! STRICT HYGIENE! INHALATION Weakness. Blue lips or finger nails. Blue skin. Headache. Dizziness. Nausea. Confusion. Convulsions. Unconsciousness. Disturbed vision. Yellow discoloration of conjunctiva. Local exhaust or breathing protection. Fresh air, rest. Artificial respiration if indicated. Refer for medical attention. SKIN MAY BE ABSORBED! (See Inhalation). Protective gloves. Protective clothing. First rinse with plenty of water, then remove contaminated clothes and rinse again. Refer for medical attention. EYES Loss of 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 Diarrhoea. Vomiting. (Further see Inhalation). Do not eat, drink, or smoke during work. Rinse mouth. Give a slurry of activated charcoal in water to drink. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Consult an expert! Ventilation. Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place. Do NOT let this chemical enter the environment (extra personal protection: complete protective clothing including self-contained breathing apparatus). Separated from strong oxidants, strong bases, food and feedstuffs, metals such as tin and zinc, nitric acid, reducing agents. Do not transport with food and feedstuffs. T+ symbol N symbol R: 26/27/28-33-50/53 S: (1/2-)28-36/37-45-60-61 Note: C UN Hazard Class: 6.1 UN Packing Group: II SEE IMPORTANT INFORMATION ON BACK ICSC: 0460 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 1,2-DINITROBENZENE ICSC: 0460 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: WHITE TO YELLOW CRYSTALS , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: Dust explosion possible if in powder or granular form, mixed with air. CHEMICAL DANGERS: May explode on heating even in absence of air. On combustion, forms toxic gases and fumes including nitrogen oxides. Reacts violently with strong oxidants, strong bases, and reducing metals, e.g, zinc and tin causing fire and explosion hazard. Mixtures with nitric acid are highly explosive! OCCUPATIONAL EXPOSURE LIMITS (OELs): TLV: 0.15 ppm; 1.0 mg/m3 (as TWA) (skin) (ACGIH 1996). OSHA PEL: TWA 1 mg/m3 skin NIOSH REL: TWA 1 mg/m3 skin NIOSH IDLH: 50 mg/m3 ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation and through the skin, and by ingestion. INHALATION RISK: A harmful contamination of the air can be reached rather quickly on evaporation of this substance at 20°C. EFFECTS OF SHORT-TERM EXPOSURE: The substance may cause effects on the blood , resulting in formation of methaemoglobin. Exposure far above OEL may result in death. The effects may be delayed. Medical observation is indicated. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: The substance may have effects on the respiratory tract formation of methaemoglobin. Prolonged exposure may lead to liver damage. Chronic exposure may result in anemia. PHYSICAL PROPERTIES Boiling point: 319°C Melting point: 118°C Density: 1.6 g/cm3 Solubility in water: poor Vapour pressure, kPa at 20°C: <0.1 Relative vapour density (air = 1): 5.8 Flash point: 150°C c.c. Octanol/water partition coefficient as log Pow: 1.69 ENVIRONMENTAL DATA The substance is very toxic to aquatic organisms. The substance may cause long-term effects in the aquatic environment. N O T E S Use of alcoholic beverages enhances the harmful effect. Depending on the degree of exposure, periodic medical examination is indicated. Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available. Do NOT take working clothes home. Transport Emergency Card: TEC (R)-730 NFPA Code: H3; F1; R4; ADDITIONAL INFORMATION ICSC: 0460 1,2-DINITROBENZENE © 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.