5 Gaskets Standard closed cell neoprene rubber gaskets are available to provide an airtight seal and prevent leakage past the filter. Gaskets are 3/4" wide by 1/4" thick. Silicone and urethane gaskets are also available. Cell Sides Wood 3/4" particle board is typically used. Butt joined edges are glued and stapled to assure a strong corner joint. Plywood is also available. Metal* A variety of metals are available including plated steels, stainless steel, and aluminum. *Available with antimicrobial treated media. Bond The media pack is thoroughly sealed to the inside of the cell sides with a variety of adhesives that prevent bypass leakage around the pack. The sealant totally encapsulates the media edges, closing off all leak paths. Close-up photo shows how the polyurethane bond, standard on most AstroCel I filters, encapsulates the pack, eliminating voids. Separators Pleat spacing is precisely maintained by corrugated aluminum separators that permit maximum usage of the media at minimum resistance. For corrosive environments, vinyl coated separators are available. Rolled edge separators are used to minimize the risk of media damage. Media AstroCel I filter media is made from sub-micron glass fibers formed into a high density paper. Continuous sheets are pleated to provide a high ratio of media area to face area, resulting in low media velocity, which is essential for ultra-high efficiency filtration. AstroCel I filter media is waterproof and fire retardant to 1000°F (538°C). A radiation resistant media is also available (for nuclear applications). Gel Seal Gel seal filters contain AAF PermaGel silicone gel sealant. Wedge Shaped Pleats The 180° turn, forming each pleat of media on both sides of the filter, is wedge shaped. The media is double scored to form a box fold around the flattened ends of the separators. The uniform fit of the wedge shaped box fold pleats prevents media damage. Single score or rolled media pleating used in some competitive filters increases the risk of media damage caused by the sharp pointed crests of the corrugated separators puncturing the media.
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