ZIRCON FLOUR

SECTION 2: Hazards identification

Emergency Overview: Off white to buff in color with no odor. Dust inhalation may be harmful to the respiratory system. This product contains naturally occurring radioactive uranium, thorium and radium. Over exposure to dusts containing radioactive uranium, thorium and radium may cause lung cancer. This product also contains respirable quartz. The predominant effect of overexposure to airborne quartz in humans is silicosis. Individuals with preexisting conditions of the lungs may have increased susceptibility to the toxicity of excessive exposure. Observance of the 5mg/m3 OSHA PEL for respirable dust will ensure that use of this product is within limits established for respirable quartz. Zircon is exempt from NRC (Nuclear Regulatory Commission) regulations for source material per 10 CFR 40.13(b) since it falls under the definition of unprocessed material containing less than 0.05% uranium or thorium. However, observance of 2.8 mg/m3 of respirable dust will under voluntary guidelines ensure that intake is less than 10 % of the Annual Limits on Intake (ALI) specified in 10 CFR 20.1502(b) and NRC (Nuclear Regulatory Commission) standards for Protection Against Radiation for thorium, uranium, radium and radioactive daughter decay products. Ingestion: May cause mild irritation. Inhalation: Addressed above. Eye Contact: May cause mild irritation. Skin Contact: May cause mild irritation.

Medical Conditions Generally Aggravated by Exposure

Asthma, chronic lung conditions or diseases and skin rashes. Toxicological Data: See item 11. Carcinogenicity: Quartz is listed by the IARC and NTP as known to be carcinogenic to humans .