arial view of mill

IMCO is one of the primary suppliers of processed slate for the asphalt sealcoat industry throughout the Western US. IMCO slate is mined and processed to provide the end user with a product that delivers consistent and relaiable results. Our slate is milled using a Raymond Roller mill for a consitent partical size distrobution. During the milling process the slate is flashed dried to provide a finished product with a low moisture content all year-around. The slate is available in 1500, 2000, 2500, and 3000 pound super sacks as well as in pneumatic bulk. For orders and hhipping information please contact our customer service at 916-383-2811. Safety Data Sheet
  • This product can expose you to chemicals including crystalline silica and titanium dioxide, which are known to the State of California to cause cancer.  For more information go to
  • Color Black
    Specific Gravity 2.6 g/cm3
    Mohs Hardness 6.5
    Compressive Strength +11,000 psi
    Loss on Ignition 5%
    Moisture Content 1%
    SiO2 62.8%
    Al2O2 17.2%
    Fe2O 6.8%
    CaO 1.16%
    MgO 2.28%
    Na2O 1.4%
    K2O 3.2%
    Mesh Size Percent Passing
    20 Mesh 99%
    60 Mesh 80%
    200 Mesh 37%
    Industrial Minerals Company
    7268 Frasinetti Road
    Sacramento, CA 95828