International Chemical Safety Cards TUNGSTEN CARBIDE ICSC: 1320 WC Molecular mass: 195.9 ICSC #    1320 CAS #     12070-12-1 RTECS # YO7250000 November 26, 1998 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Not combustible. In case of fire in the surroundings: use appropriate extinguishing media. EXPLOSION EXPOSURE PREVENT DISPERSION OF DUST!  •INHALATION Cough. Avoid inhalation of fine dust and mist. Local exhaust or breathing protection.  •SKIN Dry skin. Protective gloves. Rinse skin with plenty of water or shower.  •EYES Safety spectacles or eye protection in combination with breathing protection if powder. 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. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Sweep spilled substance into sealable containers; if appropriate, moisten first to prevent dusting. Personal protection: P2 filter respirator for harmful particles. R: S: SEE IMPORTANT INFORMATION ON BACK ICSC: 1320 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 TUNGSTEN CARBIDE ICSC: 1320 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: GREY TO BLACK POWDER PHYSICAL DANGERS: CHEMICAL DANGERS: OCCUPATIONAL EXPOSURE LIMITS: TLV: (tungsten and insoluble compounds) 5 mg/m³ as TWA, 10 mg/m³ as STEL; (ACGIH 2004). MAK: IIb (not established but data is available) (DFG 2004). ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation. INHALATION RISK: Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed. EFFECTS OF SHORT-TERM EXPOSURE: EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: Lungs may be affected by repeated or prolonged exposure to dust particles , resulting in fibrosis. PHYSICAL PROPERTIES Boiling point: 6000°C Melting point: 2780°C Density: 15.6 g/cm3 Solubility in water: none ENVIRONMENTAL DATA N O T E S Alternative CAS number 11130-73-7. Health effects of exposure to the substance have not been investigated adequately. This material is often used in conjunction with other substances such as cobalt compounds. Pneumoconiosis has occurred in exposed persons. The responsible agent is not yet clear. Card has been partly updated in April 2005. See sections Occupational Exposure Limits, EU classification, Emergency Response. ADDITIONAL INFORMATION ICSC: 1320 TUNGSTEN CARBIDE (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.