International Chemical Safety Cards MAGNESIUM OXIDE ICSC: 0504 Calcined brucite Calcined magnesia Magnesia MgO Molecular mass: 40.3 ICSC #    0504 CAS #     1309-48-4 RTECS # OM3850000 April 09, 1997 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Not combustible. NO contact with halogens or strong acids. In case of fire in the surroundings: all extinguishing agents allowed. EXPLOSION EXPOSURE PREVENT DISPERSION OF DUST!  •INHALATION Cough. See Notes. Local exhaust or breathing protection. Fresh air, rest.  •SKIN Remove contaminated clothes. Rinse skin with plenty of water or shower.  •EYES Redness. Pain. Safety goggles, 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 Diarrhoea. Do not eat, drink, or smoke during work. Rinse mouth. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water (extra personal protection: P1 filter respirator for inert particles). Separated from strong acids, halogens. Dry. R: S: SEE IMPORTANT INFORMATION ON BACK ICSC: 0504 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 MAGNESIUM OXIDE ICSC: 0504 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: HYGROSCOPIC, FINE, WHITE POWDER. PHYSICAL DANGERS: CHEMICAL DANGERS: Reacts violently with halogens and strong acids. OCCUPATIONAL EXPOSURE LIMITS: TLV (as fume): ppm; 10 mg/m3 (ACGIH 1996). MAK as fume: ppm; 6 mg/m3; (1996). OSHA PEL: TWA 15 mg/m3 NIOSH REL: See Appendix D NIOSH IDLH: 750 mg/m3 ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its aerosol or fume and by ingestion. INHALATION RISK: Evaporation at 20°C is negligible; a nuisance-causing concentration of airborne particles can, however, be reached quickly when dispersed. EFFECTS OF SHORT-TERM EXPOSURE: The substance irritates the eyes and the nose. Inhalation of fume may cause metal fever. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: 3600°C Melting point: 2800°C Relative density (water = 1): 3.6 Solubility in water: poor ENVIRONMENTAL DATA N O T E S Headache, cough, sweating, nausea and fever may be caused by exposure to freshly formed fumes. The symptoms of metal fume fever do not become manifest until 4-12 hours after exposure. Magcal, Maglite, Magox, Akro-Mag, Animag, Granmag, Magchem 100, Marmag are trade names. ADDITIONAL INFORMATION ICSC: 0504 MAGNESIUM OXIDE (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.