![Carborex 1-min](/sites/default/files/2019-02/CARBOREX%201-min.jpg)
Hennepin, Illinois
In 2001 Washington Mills acquired Exolon-ESK Company, which had produced abrasives products since its founding in 1914. Exolon-ESK operated a silicon carbide furnace plant in Hennepin, Illinois and a silicon carbide processing plant in Tonawanda, New York. Today the Hennepin plant remains as the only manufacturer of silicon carbide crude in North America.