Abstract: A panel filter includes a first media layer constructed from a first material that is permeable to air and impermeable to particulates of a targeted size or type, a support grid, and a second media layer constructed from a second material that is permeable to air. The second media layer is adhesively coupled to the first media layer without a mechanical seal. When the first media layer and second media layer are coupled, the support grid is retained between the first media layer and the second media layer.

Abstract: Fibrous padding in which the fibers are held together by a binder. The binder comprises a mixture of (a) an R.F. sealable dried residue of a thermoplastic latex emulsion, and (b) an R.F. sealable plastic powder of polyester, polyamide, or mixtures thereof which melt in a narrower temperature range than the latex emulsion residue. Such fibrous padding is capable of R.F. sealing with better adhesion to loose weave knit fabrics which are uncoated with adhesive, and the resulting bond exhibits improved heat stability.

Abstract: A composite scouring pad is prepared comprising a non-woven layer and a flexible foam layer in juxtaposition to each other, the flexible foam being needled to the nonwoven layer by fibers from the non-woven layer which pass through the foam layer and emerge from its opposite side. The opposite side of the foam layer is coated with a resinous layer which anchors the emergent fibers thereon, the fibers providing a desired roughness to said side, making said side suitable as a scouring surface. The non-woven layer is impregnated with a resin and, in the preferred embodiment, with abrasive particles to provide a second scouring surface.