c it will be noted that in some instances ptfe felt for use in applications such as incinerators can have particles of catalyst deposited on the surface or embedded into the ptfe fibers this can be desirable in a pleatable fabric and typically does not affect pleatability for example some catalysts help reducing emissions of dioxin furan or nitrous oxide from waste incineration the catalyst typically is typically provided a volume less than 20 of the volume of the ptfe fibers examples of catalysts include titanium dioxide tio 2 iron and cobalt provided in the form of oxides nickel platinum and palladium other examples of catalysts include zeolith copper oxide tungsten oxide aluminum oxide chromium oxide gold silver rhodium etc if used the catalyst should be provided in a particles size of less than 10 microns but can be of any suitable shape such as spheres whiskers plates flakes etc a resulting pleatable filtration material or fabric can include ptfe fibers spunlaced to a steel scrim covered by a membrane such a fabric can be pleated using a traditional pleater operating at room temperature the use of a pleatable metallic scrim can render the use of heated pleater blades unnecessary an exemplary embodiment thereof is provided below ptfe fibers are spunlaced onto a 400 g m.