International Chemical Safety Cards BENTONITE ICSC: 0384 Wilkinite ICSC #    0384 CAS #     1302-78-9 RTECS # CT9450000 July 04, 1997 Validated 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 Avoid inhalation of fine dust and mist.  •SKIN Protective gloves.  •EYES Safety spectacles.  •INGESTION SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Personal protection: P1 filter respirator for inert particles. SEE IMPORTANT INFORMATION ON BACK ICSC: 0384 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 BENTONITE ICSC: 0384 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: ODOURLESS GRANULES OR POWDER IN VARIABLE COLOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance is a weak base in suspension in water. OCCUPATIONAL EXPOSURE LIMITS: TLV not established. ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of dust. INHALATION RISK: Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly. EFFECTS OF SHORT-TERM EXPOSURE: EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: The substance may have effects on the lungs , resulting in silicosis due to the presence of crystalline silica (see ICSC 0808). PHYSICAL PROPERTIES Relative density (water = 1): 2.5 Solubility in water: none ENVIRONMENTAL DATA N O T E S Bentonites are aluminate silicate and can contain crystalline silica. The content varies widely from less than 1% to about 24%. ADDITIONAL INFORMATION ICSC: 0384 BENTONITE (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.