International Chemical Safety Cards SILICON CARBIDE (non-fibrous) ICSC: 1061 Carbon silicide Silicon monocarbide SiC Molecular mass: 40.1 ICSC #    1061 CAS #     409-21-2 RTECS # VW0450000 October 28, 2004 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  •INHALATION Cough. Avoid inhalation of dust . Fresh air, rest.  •SKIN  •EYES Redness. Pain. Safety goggles. 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 Personal protection: P1 filter respirator for inert particles. Sweep spilled substance into covered containers. R: S: SEE IMPORTANT INFORMATION ON BACK ICSC: 1061 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 SILICON CARBIDE (non-fibrous) ICSC: 1061 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: YELLOW TO GREEN TO BLUE TO BLACK CRYSTALS , DEPENDING ON PURITY PHYSICAL DANGERS: CHEMICAL DANGERS: OCCUPATIONAL EXPOSURE LIMITS: TLV: (as inhalable dust) 10 mg/m³ as TWA; TLV: (as respirable dust) 3 mg/m³ as TWA; (ACGIH 2004). MAK: (respirable fraction of the aerosol) 1.5 mg/m³; (DFG 2004). NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) NIOSH IDLH: No data ROUTES OF EXPOSURE: INHALATION RISK: A nuisance-causing concentration of airborne particles can be reached quickly when dispersed. EFFECTS OF SHORT-TERM EXPOSURE: May cause mechanical irritation. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Sublimation point: 2700°C Density: 3.2 g/cm3 Solubility in water: none ENVIRONMENTAL DATA N O T E S This card does not apply to silicon carbide in fibrous or whisker form. Carborundum is a trade name. There is evidence of fibrosis in mixed dust situations, the risk of which is enhanced in persons with tuberculosis. There is no evidence that silicon carbide (non-fibrous) causes fibrosis in the absence of other dusts. ADDITIONAL INFORMATION ICSC: 1061 SILICON CARBIDE (non-fibrous) (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.