Home: SGL Group – The Carbon Company | SGL CARBON SGL Group, SGL Carbon SE, Homepage, Graphite, Carbon, Carbon fibers, CFRP, The lineage of SGL Carbon’s St. Marys facility dates back to 1899, carrying digitization from St. Marys out into the world. The production capabilities in the largest town of Elk County, as the region is called, is a central location of SGL Carbon’s production chain that enables and advances global digitization, especially of LED and semiconductor technology as the basis for computer chips.