ECCOSORB^® DSF is a series of Refers to the medium of air (or vacuum) in which radio waves may travel. This is in contrast to waves traveling on transmission lines such as coax or waveguide, or through a medium, such as an Free Space Absorber (Specular Absorber)free space resonant absorbers that are available in the 3 GHz to 40 GHz range. These dielectrically loaded narrowbanded absorbers reflect 1% or less of normally incident energy (at least 20 dB down) at the design frequency. Unlike typical iron-filled absorbers, ECCOSORB^® DSF uses a Silicon Carbide filler that prevents oxidation. As a resonant absorber, ECCOSORB^® DSF should be intimately backed to a metal surface. 

Applications include lining radar nacelles and masts of ships where normal iron filled absorbers would oxidize in a marine environment.