May cause irritation. May cause irritation. No hazards known or suspected. Not listed by OSHA, NTP or IARC as a carcinogen. Does not contain asbestos or fiberous zeolite minerals.
Crystalline silica is considered a hazard by inhalation.
During October 1996, IARC reviewed the literature for polymorphs of crystalline silica and determined that there is suffient evidence in humans for the carcinegenity of inhaled crystalline silica in the form of quartz or cristobolite from occupational sources. Avoid breathing dust. Copyright 1998-2000 GSA Resources, all rights reserved.