silica According to OSHA's topic sheet Occupational Safety and Health Administration (OSHA) www.osha.gov/dsg/topics/silicacrystalline OSHA Silica Topic Page produce it new rule https://www.osha.gov/dsg/topics/silicacrystalline/ https://www.osha.gov/dsg/topics/silicacrystalline/ osha.gov/dsg/topics/silicacrystalline Safety and Health Topics â Silica www.osha.gov/dsg/topics/silicacrystalline/  OSHA web site silica dust OSHA's topic sheet says proposed rule http://www.osha.gov/...icacrystalline/ Silica crystalline silica