Media : Treatments : SDF® Technology SDF (Surface Densified Fabric) technology improves and corrects the weave of a fabric, producing a superior woven filter media. SDF treated fabrics achieve greater flow capacity, retain a more permeable dust cake, and maintain lower pressure drop. SDF particulate capture efficiency is rated up to ten times that of standard woven filter fabrics. How It Works Though not visible to the naked eye, there are minor inconsistencies in both yard spacing and uniformity of the texturized surface of woven fabrics. These minor inconsistencies can result in blinding or eventual bleeding of your baghouse filters. Surface densification works by uniformly aligning the weave of the fabric and densifying the textured fibers. The result is uniform openings over the entire surface of the filter. Greater Flow Capacities Because of the uniform flow velocity, pressure drops remain low. By eliminating high pressure differential, particles do not become embedded into the fabric and are easily released during cleaning cycles. A more porous and consistent dust cake is created, resulting in greater capture efficiencies. Longer Filter Life While surface densification is a mechanical process, the fabric is actually strengthened by the SDF process. Because of the weave uniformity, fabrics have greater resistance to tears, stretching, and abrasion holes. The SDF process can be applied to all styles of woven filter fabrics, including fiberglass.