Bentonite Clay (100%)

SECTION 2: Hazards identification

OSHA Chemical Name: Bentonite Clay (100%) Chemical Family: Natural Mineral, Montmorillonite CAS No: 1302-78-9 (Bentonite is on the TSCA inventory) Formula: Naturally occurring hydrated aluminosilicate of sodium, calcium, magnesium, and iron NFPA/HMIS: Health - 1*, Fire - 0, Reactivity - 0, Specific Hazard - See Section VI. DOT Class: Not Regulated HAZARDOUS COMPONENTS: OSHA PEL ACGIH TLV NIOSH REL % (Specific Chemical Identity: (TWA) (TWA) (TWA) (optional) Common Name(s)) Quartz: CAS# 14808-60-7 - - - - (naturally occurring constituent) Respirable Quartz: 0.1 mg/m3 50 ug/m3 50 ug/m3 < 2% Nuisance Dust - Respirable: 5 mg/m3 3 mg/m3 - - Total Dust: 15 mg/m3 10 mg/m3 - - OSHA PEL - OSHA Permissible Exposure Limit, 8 hour Time-Weighted Average ACGIH TLV - American Conference of Governmental Industrial Hygienists Threshold Limit Value, 8 hr. TWA, 40 hr. week NIOSH REL - National Institute for Occupational Safety and Health, Recommended Exposure Limit, 10 hr. TWA, 40 hr. week WARNING This product contains a small amount of quartz that may cause delayed respiratory disease if inhaled over a prolonged period of time. Avoid breathing dust. Use NIOSH/MSHA approved respirator where TLV for quartz may be exceeded. IARC Monographs on the evaluation of the Carcinogenic Risk of Chemicals to Humans (volume 68, 1997) concludes that quartz is carcinogenic to humans (IARC classification 1). Note: The Permissible Exposure Limits (PELs) reported above are the pre- 1989 limits that were reinstated by OSHA June 30, 1993 following a decision by the United States Circuit Court of Appeals for the 11th Circuit. Federal OSHA is now enforcing these PELs. More restrictive exposure limits may be enforced by some other jurisdictions. National Institute for Occupational Safety and Health (NIOSH) has recommended that the permissible exposure limit be changed to 50 micrograms respirable free silica per cubic meter of air (0.05 mg/ m3) as determined by a full shift sample up to a 10 hour working day, 40 hours per week. See: 1974 NIOSH criteria for a recommended Standard for Occupational Exposure to Crystalline Silica for more detailed information.