International Chemical Safety Cards alpha-NAPHTHYLTHIOUREA ICSC: 0973 alpha-NAPHTHYLTHIOUREA ANTU 1-(1-Naphthyl)-2-thiourea 1-Naphtylthiourea C11H10N2S Molecular mass: 202.3 CAS # 86-88-4 RTECS # YT9275000 ICSC # 0973 UN # 1651 EC # 006-008-00-0 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 Risk of fire and explosion on contact with strong oxidizers. EXPOSURE PREVENT DISPERSION OF DUST! STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR! INHALATION Laboured breathing. Shortness of breath. Symptoms may be delayed (see Notes). 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, or face shield. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor. INGESTION Abdominal pain. Vomiting. 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, strong bases, 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 © 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 alpha-NAPHTHYLTHIOUREA ICSC: 0973 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: WHITE ODOURLESS CRYSTALLINE POWDER; BITTER TASTE. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on heating producing toxic fumes including nitrogen oxides and sulfur oxides. Reacts with strong oxidants causing fire and explosion hazard. OCCUPATIONAL EXPOSURE LIMITS (OELs): TLV (as TWA): ppm; 0.3 mg/m3 (ACGIH 1991-1992). 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: Inhalation of aerosol may cause lung oedema (see Notes). The effects may be delayed. Medical observation is indicated. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: Repeated or prolonged contact with skin may cause dermatitis. PHYSICAL PROPERTIES Melting point: 198°C Relative density (water = 1): >1 Solubility in water: none Octanol/water partition coefficient as log Pow: 1.66 (calculated) ENVIRONMENTAL DATA N O T E S The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. Commonly present impurities can change the toxicological properties of this substance; consult an expert. Do NOT take working clothes home. Anturate, Bantu, Krysid and Rattrack are trade names. Transport Emergency Card: TEC (R)-61G53b ADDITIONAL INFORMATION ICSC: 0973 alpha-NAPHTHYLTHIOUREA © 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.