Silicon dioxide: SiO2 

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hazard description- harmful by inhalation, irritating to respiratory tract

physical properties- white odorless powder

acute effects- irritant to skin, mucous membranes, & eyes

symptoms of overexposure- tumorigenic, reproductive, & carcinogenic effects observed in tests on lab animals 

prolonged inhalation of silica may cause lung disease, silicosis

coughing, breathing difficulty

possible carcinogen to humans

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