International Chemical Safety Cards 1,2,4-TRIAZOLE ICSC: 0682 Pyrrodiazole 1H-1,2,4-Triazole C2H3N3 Molecular mass: 69.1 ICSC #    0682 CAS #     288-88-0 RTECS # XZ3806000 October 27, 1994 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. EXPOSURE PREVENT DISPERSION OF DUST! PREVENT GENERATION OF MISTS! IN ALL CASES CONSULT A DOCTOR!  •INHALATION Local exhaust or breathing protection. Fresh air, rest. Refer for medical attention.  •SKIN Protective gloves. Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention.  •EYES Redness. Pain. Safety goggles. 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. Rinse mouth. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Sweep spilled substance into sealable containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place (extra personal protection: P2 filter respirator for harmful particles). Separated from strong oxidants, acids. R: S: SEE IMPORTANT INFORMATION ON BACK ICSC: 0682 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 1,2,4-TRIAZOLE ICSC: 0682 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: BROWN SOLID IN VARIOUS FORMS , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on heating producing toxic and irritating fumes including nitrogen oxides (see also ICSC # 0930). Reacts with strong acids and strong oxidants. OCCUPATIONAL EXPOSURE LIMITS: TLV not established. ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation and by ingestion. INHALATION RISK: Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly on spraying or when dispersed, especially if powered. EFFECTS OF SHORT-TERM EXPOSURE: The substance irritates the eyes. The substance may cause effects on the central nervous system , resulting in tremors, excitement and respiratory depression. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point (decomposes): 260°C Melting point: 120-121°C Solubility in water, g/100 ml at 20°C: 125 Flash point: 170.0°C Auto-ignition temperature: 490°C ENVIRONMENTAL DATA N O T E S Insufficient data are available on the effect of this substance on human health, therefore utmost care must be taken. ADDITIONAL INFORMATION ICSC: 0682 1,2,4-TRIAZOLE (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.