Environmental Materials Environmental Materials Inc, Class C Fly Ash, Bakken Oil Fields, Coal Ash Recycling, ENVIRO DRY, Lime Kiln Dust, Synthetic Gypsum, Cement Kiln Dust, Bonding Agents, Drying Agents, EMI, Drill Cutting Stabilization, ash blending, ash bagging, Coal by-products Environmental Materials, Inc.(EMI) facilitates the beneficial recycling of industrial by-products such as coal fly ash, lime kiln dust (LKD), synthetic gypsum and cement kiln dust (CKD).