About Standard Felt Filter Bags When it comes to felt filter bags, Pall FSI has the answer. Our years of experience give us an advantage over our competitors, and our felt filter bags show it. Our felt bags are built to the highest quality and are designed to withstand higher solid loading, suitable for a wide variety of applications using vessel or open filtration systems.Our no-bypass Polyweld® welded seam bags eliminate the possibility of fluid bypass through needle holes. Welded felt bags are silicone free to eliminate cratering for improved surface results.  These bags also receive a glazed and singed finish which provides a fiber-free finish and virtually eliminates unwanted fiber migration.   Our patented Polyloc® ring creates a hermetic seal that prevents liquid bypass, saves time and produces clearer results.  Customers looking for even longer service life can consider our Extended Life filter bags which provide superior filtration of all sized particles, as well as up to twice the dirt holding capacity of a standard filter bag. Please refer to the Pall Specification data sheet for more details. Filter Media Felt, high temperatureFelt, nylonFelt, polyesterFelt, polypropyleneFelt, Teflon® Maximum Operating Temperature Polypropylene: 200-220° F (93-104° C)Polyester: 275-325° F (135-162° C)Nylon: 275-300° F (135-149° C)High Temperature: 400-450° F (204-232° C)Teflon: 450-500° F (232-260° C) CoverPlainPolyester multifilamentNylon monofilament RingPolypropylene PolyLoc®Polyester PolyLoc®Nylon PolyLoc®CunoSnap ring metalStainless steel snap ringCommercial steel ringCommercial plastic ring
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