Environmentally Friendly Copper Slag is composed of Ferro silicate material and metal oxides, formed when the molten slag is quenched in cold water. The Copper Slag comes in angular grain shaped forms. The Copper Slag has a specific gravity of 3.8 and Moh hardness of 7. Environmentally Friendly Copper Slag is offered in a bulk density [loose] of 117 lbs./ft.3.