VAN E N NRC R This product contains Crystalline Silica, which has been classified by ARC as a group 1 carcinogen based on evidence of carcinogenicity in experimental animals and evidence of carcinogenicity in humans. Prolonged exposure to dust also may cause silicosis or other respiratory diseases. When working with this product, minimize creation of dust. Always use a NOSH or SHAM particulate respirator. A Material Safety Data Sheet (MADS) is available upon request at your brick dealer or at the factory.