International Chemical Safety Cards SELENIUM TRIOXIDE ICSC: 0949 Selenic anhydride SeO3 Molecular mass: 126.9 ICSC #    0949 CAS #     13768-86-0 RTECS # UN #        3283 EC #         034-002-00-8 October 03, 2000 Peer reviewe TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Not combustible but enhances combustion of other substances. Many reactions may cause fire or explosion. Gives off irritating or toxic fumes (or gases) in a fire. NO contact with combustibles . In case of fire in the surroundings: use appropriate extinguishing media. EXPLOSION EXPOSURE PREVENT DISPERSION OF DUST! STRICT HYGIENE!  •INHALATION Burning sensation. Cough. Laboured breathing. Sore throat. Shortness of breath. Symptoms may be delayed (see Notes). Ventilation, local exhaust, or breathing protection. Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.  •SKIN Redness. Pain. Blisters. Skin burns. Protective gloves. Protective clothing. First rinse with plenty of water, then remove contaminated clothes and rinse again. Refer for medical attention.  •EYES Redness. Pain. Severe deep burns. 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 Sore throat. Nausea. Abdominal pain. Burning sensation. Diarrhoea. Vomiting. Shock or collapse. Do not eat, drink, or smoke during work. Wash hands before eating. Rinse mouth. Do NOT induce vomiting. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Sweep spilled substance into containers. Carefully collect remainder, then remove to safe place. Personal protection: complete protective clothing including self-contained breathing apparatus. Do NOT absorb in saw-dust or other combustible absorbents. Do NOT let this chemical enter the environment. Separated from combustible substances, food and feedstuffs . Dry. Keep in a well-ventilated room. Do not transport with food and feedstuffs. Note: A T symbol N symbol R: 23/25-33-50/53 S: 1/2-20/21-28-45-60-61 UN Hazard Class: 6.1 UN Packing Group: II SEE IMPORTANT INFORMATION ON BACK ICSC: 0949 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 SELENIUM TRIOXIDE ICSC: 0949 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: YELLOWISH WHITE HYGROSCOPIC CRYSTALLINE POWDER PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on heating producing toxic fumes . The solution in water is a strong acid, it reacts violently with bases and is corrosive. The substance is a strong oxidant and reacts with combustible and reducing materials. OCCUPATIONAL EXPOSURE LIMITS: TLV: (as Se) 0.2 mg/m³ as TWA; (ACGIH 2004). MAK: (as Se) (Inhalable fraction) 0.05 mg/m³; Peak limitation category: II(4); Carcinogen category: 3B; Pregnancy risk group: C; (DFG 2004). ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its aerosol and by ingestion. INHALATION RISK: Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly especially if powdered. EFFECTS OF SHORT-TERM EXPOSURE: The substance is corrosive to the eyes, the skin and the respiratory tract. Inhalation of may cause lung oedema (see Notes). The substance may cause effects on the eyes , resulting in allergic-type reaction of the eyelids (rose eye). Medical observation is indicated. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: Repeated or prolonged contact may cause skin sensitization. The substance may have effects on the respiratory tract , central nervous system , gastrointestinal tract and liver , resulting in nasal irritation, persistent garlic odour, stomach pain, nervousness and liver impairment . PHYSICAL PROPERTIES Decomposes below boiling point at 180°C Melting point: 118°C Density: 3.6 g/cm3 Solubility in water: very good ENVIRONMENTAL DATA The substance is harmful to aquatic organisms. 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 is therefore essential. Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered. Card has been partly updated in April 2005. See sections Occupational Exposure Limits, Emergency Response. Transport Emergency Card: TEC (R)-61GT3-II-S ADDITIONAL INFORMATION ICSC: 0949 SELENIUM TRIOXIDE (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.