The Environmental Protection Agency (EPA) indicated in a May 8, 2013, letter to Vexor Technology that Vexor’s coal substitute could be treated as fuel, not as waste, when burned in certain circumstances. EPA’s decision focuses on Vexor’s selection, separation and processing of input materials and its end-use product to conclude the product can be treated as a fuel. Specifically, EPA’s letter states that “prevention/removal of contaminants is achieved by limiting contaminants via source control, removing the ferrous metals in three stages, and isolating and removing other materials/components.” The letter identifies improvement of the fuel characteristics via source control, particle size reduction and creation of a homogeneous product within each batch. It cites “chemical improvement to the as-fired energy content” by adding absorbents or materials, such as nonhalogenated oils and carbon black.