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Dust Collector Filters: Expanded PTFE Membrane Filter Bag
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Click the email icon above to contact customer service for a fast, no-pressure consultation to help you select the PTFE Membrane Filter Bag best for your application. You will be contacted shortly by a representative with a competitive price quote. Guaranteed.
U.S. Air Filtration provides Expanded PTFE Membrane finishes for for all dust collector filter bag applications. Using a PTFE Membrane coated filter bag allows baghouse engineers to reduce capital and operational costs, as well as the ability to design the baghouse for higher airflows. Use of a PTFE membrane coated filter bag also provides for a degree of protection from the "unknown" and "unpredictable" changes that sometimes occur during baghouse operations. The PTFE membrane is in most instances, the best economic choice for filter media.
The expanded PTFE Membrane permits more air to pass through the filter media while trapping particulate on the surface. Use of the PTFE membrane filter media for baghouse filtration represents the highest technological development available today in the filter media finish marketplace. Some engineers prefer to think of PTFE membrane as a pre-installed primary dust cake that immediately, when installed into a baghouse, provides the high efficiency levels that normally occur after a bag has been in use for several months of application. See diagram above. As the PTFE membrane acts as the primary dust cake on a filter bag, it supplies a permeability averaging 8-12 CFM. This is much lower than a brand new bag made from convential woven, knitted, or felted media. However, the conventional media has no pre-installed primary dust cake and will see it's permeability reduced sharpl when placed into operation, when the particulate will become lodged in the depth of the pore structure of the media. It is at this point only that a comparison can be made between the output of the membrane surface and the dust cake of conventional media. As the particulate is also collected on a surface that is both hydrophobic and smooth, the cake release of PTFE membrane products is far superior to the conventional medias.
Some of the main reasons why engineers choose to use an Extended PTFE Membrane for filtration are:
- Superior emission control: resulting in a reduction of regulatory fines & the ability to meet more stringent emission codes
- Improved service life of filter media: the non-stick PTFE surface promotes dust cake release which reduces the energy needed to keep the filter bags clean. Less wear and ear on filter bags results in longer service life.
- Low operating pressure drops: Initial filter bag drag or pressure drop in PTFE membrane filters starts off low and maintains this level better than the alternative conventional media which tends to build dust cake and pressure drop accordingly. Increased pressure drop can be equated with wasted energy to operate a baghouse.
- Ability to recover from upset conditions: In plant situations where a baghouse might be subject to thermal, chemical, or moisture upsets, a PTFE membrane coated filter bag has no problem handling these situations since PTFE membranes resist attack by these agents and are ready to recover permeabilty once they are placed back on-line. This could save a baghouse from costly plant shut-downs, and filter bag replacement costs.
- Higher air flows: See section above about low pressure drops. In a baghouse not previously equipped with PTFE membrane coated filter media, substitution of PTFE membrane filter bags results in higher air-flow capability. Alternatively, baghouses designs which incorporate PTFE Membrane filter media from the start often select higher air-to-cloth ratio designs using fewer filter bags.
- Cost effectiveness: The initial cost of PTFE membrane filter media may be higher than the alternative conventional filter media, the many benefits listed above provide a strong argument favoring PTFE membrane as the most cost effective filter media when measured over the useful life of the product. As emissions regulations become even more stringent, the same arguments will favor PTFE membrane even more clearly.
USAF can provide filter bags coated with PTFE membrane for any baghouse application. USAF engineers stand ready to assist you in the retrofitting of your current baghouse into PTFE membrane filter bags, or to provide you with replacement PTFE membrane filter bags for your current application. Please call us for a quote at 888-221-0312.
It is important to us that we offer you the most effective solution for your specific dust collector PTFE membrane filter bag needs. In order to do so, we will need the following information from you when you call 888-221-0312 to place an order:
- Brand name/ original manufacturer of the original dust collector or baghouse
- Is the baghouse currently outfitted with PTFE membrane filter bags?
- Is it a shaker or a pulse jet style dust collector?
- How does the bag load? (top, bottom, side, with a clamp)
- Measurements for the diameter (or square) and length of the bag (send us sample bag, or call for measurement instructions)
- Size of existing cage
- Top and bottom construction (See our Filter Bag Design Spreadsheet for assistance)
- Any other special requirements that you might have (groundwire, anti-collapse rings, wearstrip)
To place an order, call a U.S. Air Filtration Parts Specialist at 888-221-0312.
Temecula, CA 92590
