Ultra-Web® SB Cartridge Filters Withstand High Humidity in Gypsum Manufacturing Gypsum wallboard is composed of fiberglass, paper, vermiculite, calcium sulfate dehydrate. During manufacture, heat and moisture cause gypsum dust to get sticky. Later the dust dries into a hard crystalline material that “blinds off” (plugs) the filters in the dust collector. What a challenge! When the plant engineer for this major midwestern wallboard manufacturer heard of new moisture-resistant Donaldson® Torit® Ultra-Web® SB cartridge filters, he decided to give them a try in his Downflo® II dust collector. The 24- filter unit is located by an end-trim saw to capture dust as the wallboard is cut to a specific length. Ultra-Web SB combines the excellent surface-loading and dust release capabilities of Ultra-W

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