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Dust Mask for Mosaic GroutDust Mask 3M 8000 respirator. Like virtually all concrete products, grout contains Portland Cement, which is mildly caustic, and powdered silica. These dusts are bad for the lungs and are irritating. We use these masks to minimize our daily exposure. For advice on grouting your mosaic, please see our Mosaic FAQ page or our page of Mosaic instructions.
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