International Chemical Safety Cards iso-PHTHALONITRILE ICSC: 1583 1,3-Benzenedicarbonitrile Isophthalodinitrile m-Dicyanobenzene C8H4N2 Molecular mass: 128.14 ICSC #    1583 CAS #     626-17-5 RTECS # CZ1900000 UN #        3276 April 20, 2005 Peer reviewed 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 cylinder cool by spraying with water. EXPOSURE PREVENT DISPERSION OF DUST!  •INHALATION Cough. Avoid inhalation of dust. Fresh air, rest.  •SKIN Rinse and then wash skin with water and soap.  •EYES Redness. Safety goggles . First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.  •INGESTION Diarrhoea. Do not eat, drink, or smoke during work. Wash hands before eating. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Personal protection: P1 filter respirator for inert particles. Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Separated from strong oxidants, food and feedstuffs. Do not transport with food and feedstuffs. R: S: UN Hazard Class: 6.1 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 1583 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 iso-PHTHALONITRILE ICSC: 1583 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS TO WHITE CRYSTALLINE POWDER , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: Dust explosion possible if in powder or granular form, mixed with air. CHEMICAL DANGERS: Reacts with strong oxidants . The substance decomposes on heating producing toxic gases including hydrogen cyanide . On combustion, forms nitrogen oxides. OCCUPATIONAL EXPOSURE LIMITS: TLV: 5 mg/m³ as TWA; (ACGIH 2004). MAK not established. ROUTES OF EXPOSURE: INHALATION RISK: Evaporation at 20°C is negligible; a nuisance-causing concentration of airborne particles can, however, be reached quickly when dispersed, especially if powdered. EFFECTS OF SHORT-TERM EXPOSURE: The substance is irritating to the eyes. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Sublimation > 162°C Density: 1.3 g/cm3 Solubility in water, g/100 ml at 20°C: 0.07 Vapour pressure, Pa : 1.33 Relative vapour density (air = 1): 4.42 Flash point: >150°C Octanol/water partition coefficient as log Pow: 0.39 ENVIRONMENTAL DATA N O T E S Health effects of exposure to the substance have not been investigated adequately. Transport Emergency Card: TEC (R)-GT1-III ADDITIONAL INFORMATION ICSC: 1583 iso-PHTHALONITRILE (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.