International Chemical Safety Cards alpha-NAPHTHYLTHIOUREA ICSC: 0973 Antu 1-(1-Naphthyl)-2-thiourea 1-Naphtylthiourea C11H10N2S / C10H7NHCSNH2 Molecular mass: 202.3 ICSC #    0973 CAS #     86-88-4 RTECS # YT9275000 UN #        1651 EC #         006-008-00-0 April 11, 2000 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Combustible under specific conditions. Gives off irritating or toxic fumes (or gases) in a fire. Powder, water spray, foam, carbon dioxide. EXPLOSION EXPOSURE PREVENT DISPERSION OF DUST! STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR!  •INHALATION Cough. Laboured breathing. Shortness of breath. Local exhaust or breathing protection. Fresh air, rest. Half-upright position. Artificial respiration if indicated. Refer for medical attention.  •SKIN MAY BE ABSORBED! Protective gloves. Protective clothing. Remove contaminated clothes. Rinse and then wash skin with water and soap.  •EYES Safety goggles, 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 Abdominal pain. Vomiting. Laboured breathing. Do not eat, drink, or smoke during work. Wash hands before eating. 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 Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place. (Extra personal protection: P3 filter respirator for toxic particles). Separated from strong oxidants, silver nitrate, food and feedstuffs . Do not transport with food and feedstuffs. T+ symbol R: 28-40 S: 1/2-25-36/37-45 UN Hazard Class: 6.1 UN Packing Group: II SEE IMPORTANT INFORMATION ON BACK ICSC: 0973 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 alpha-NAPHTHYLTHIOUREA ICSC: 0973 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: WHITE , ODOURLESS CRYSTALLINE POWDER PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on heating producing toxic gases and toxic fumes including nitrogen oxides , sulfur oxides and carbon monoxide . Reacts with strong oxidants such as silver nitrate causing fire and explosion hazard. OCCUPATIONAL EXPOSURE LIMITS: TLV (as TWA): 0.3 mg/m3 A4 (ACGIH 1999). MAK: 0.3 mg/m3; as I (1999) MAK: class II.2 (1999) OSHA PEL: TWA 0.3 mg/m3 NIOSH REL: TWA 0.3 mg/m3 NIOSH IDLH: 100 mg/m3 ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its aerosol, through the skin 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 to substance could cause lung oedema. Medical observation is indicated. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Decomposes below boiling point: see notes Melting point: 198°C Density: >1 g/cm3 Solubility in water: none Octanol/water partition coefficient as log Pow: 1.66 (calculated) ENVIRONMENTAL DATA N O T E S Commonly present impurities can change the toxicological properties of this substance; consult an expert. Technical product is a blue-grey powder. Temperature of decomposition unknown in literature. Do NOT take working clothes home. Anturate, Bantu, Kill Kantz, Krysid, Rattrack and Rat-tu are trade names. Transport Emergency Card: TEC (R)-61G12b ADDITIONAL INFORMATION ICSC: 0973 alpha-NAPHTHYLTHIOUREA (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.