Filter Elements High-quality raw material, precision weaving and advanced fabrication capabilities ensure exceptional lot-to-lot consistency and superior filter performance. As the leading supplier of woven filter media, Sefar offers the widest available selection of materials in many different weave types, finishes, coatings and fabrications. Sefar filter media can be found in almost all components requiring reliable safety filters, high filtration performance, acoustic attenuation or electronic shielding.