Coal ash is a byproduct of the burning of coal. In the attempt to control the negative environmental impact of burning coal, most producers of coal ash attempt to find applications of the ash in other industries.
There are many coal ash applications, even in the kitchen. Coal ash in the kitchen is located in some concrete countertops. Several companies find uses for coal ash in roofing shingles and bowling balls.
These roofing shingles and bowling balls are more resistant to fracture and provide good resistance to the degradation that can result from weathering.