06/04

SECTION 2: Hazards identification

Emergency Overview These products contain crystalline silica. Do not breathe dust. May cause delayed lung injury (silicosis, pneumoconiosis).

Principle Routes of Exposure

Signs & Symptoms Single, Repeated, Severity (Mild, Acute and Target or Lifetime Moderate, Chronic Health Organ(s) Exposure Severe) Effect(s) Eye Irritation Skin Irritation Irritation and/or dermatitis Inhalation Transitory upper Silicosis Lungs respiratory irritant. Cough, tightness in chest, shortness of breath, wheezing and sputum production. Ingestion Not likely route. Other

Medical Conditions Generally Aggravated by Exposure

Any pre-existing respiratory or pulmonary disease or condition, such as, but limited to, bronchitis, emphysema, and asthma. Individuals with silicosis are predisposed to develop tuberculosis. Carcinogenicity (IARC, NTP) NTP: Yes The National Toxicology Program (NTP) published its Ninth Annual Report on Carcinogens which concludes that "silica, crystalline (respirable)" is known to be a human carcinogen. The NTP conclusion is based on sufficient evidence for the carcinogenicity of respirable crystalline silica in experimental animals and limited evidence in humans. IARC: Yes IARC Monographs Volume 68: Silica, silicates, coal dust, and para-aramid fibrils states that there is sufficient evidence in humans for the carcinogenicity of inhaled crystalline silica in the forms of quartz and cristobalite from occupational sources. Crystalline silica is categorized in the "Group 1" category which the IARC defines as the agent in carcinogenic to humans. OTHER: California Crystalline Silica (quartz) is classified as a substance known to the State of California Proposition 65 to be a carcinogen.

Environmental effects

No ecotoxicity data is available. This product is not expected to present an environmental hazard.