Utilize the input text as a context reference, choose the right relationship between 'GrafTech' and 'graphite' from the options.
Options: location of formation, product/material produced, member of, legal form

GrafTech our graphite electrode producer generated company EBITDA of $40 million this quarter, due to lower volumes and sale prices as the global economic slowdown has impacted demand for graphite electrodes.
product/material produced