The “Emissivity” page on the FAR Associates website includes a discussion of their unique instrument along with graphs and some tables of spectral emissivity values are evidently all reproduced from the Thermophysical Properties of Matter, Vol. 7: Thermal Radiative Properties, Y.S. Touloukian and D.P. DeWitt, IFI/Plenum, New York, 1970.
These include curves for: Carbon (Graphite), Tungsten, Aluminum, Copper, Iridum, Iron, Molybdenum, Silicaon Carbide, Stainless Steel and Titanium.