Powder and Bulk Engineering


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36 / August 2019 Updated 2019 powderbulk.com Filter media selection* Fiber type Temperature limits (dry heat only) Acid resistance Alkali resistance Hydrolysis resistance Oxidation resistance Cotton 180ºF/85ºC Poor Good Good Good PVC 150ºF/65ºC Excellent Excellent Excellent Excellent Polypropylene 190ºF/90ºC Excellent Excellent Excellent Poor Nylon 230ºF/110ºC Poor Excellent Good Good Homopolymer acrylic 257ºF/125ºC Good Good Good Fair Polyester 300ºF/150ºC Good Poor Poor Good Polyphenylene sulfide (PPS) 375ºF/190ºC Excellent Excellent Excellent Fair Aramid 400ºF/205ºC Poor Excellent Poor Fair Polyimide 450ºF/235ºC Fair Fair Good Good PTFE 500ºF/260ºC Excellent Excellent Excellent Excellent Fiberglass 550ºF/285ºC Good Fair Excellent Excellent *Courtesy Filter Media Services, Cincinnati, OH. Find more information in the article "Specialty bag filter media for better performance in tough applications" by Clint Scoble, Powder and Bulk Engineering, October 2010, page 45. Typical feeder suitability for various pneumatic conveying applications* Feeder Pressure conveying Vacuum conveying Pressure differential (psi) Abrasive materials Hot materials Fine powders Fibrous materials Screw No Yes 0 Yes Yes Yes No Belt No Yes 0 Possible No No No Rotary valve Yes Yes 15 Yes Yes Yes Possible High-pressure rotary valve Yes Yes 50 Yes Yes Yes Avoid Pressure-sealing screw pump Yes Yes 3 Yes Yes Yes No Eductor Yes No 4 Yes Yes Yes No Double-dump valve Yes Yes 15 Yes Yes Yes Yes Screw pump Yes No 50 Yes Yes Yes No Blow tank Yes No 100 Yes Yes Yes No Lock hopper Yes Yes 300 Yes Yes Yes No *Be aware that there are exceptions to the general information here. Courtesy Jenike & Johanson, Tyngsboro, MA. Find more information in the article "How to reliably feed material into your pneumatic conveying system" by Jayant Khambekar and Eric Maynard, Powder and Bulk Engineering, July 2011, page 45. Equipment Selection Charts These handy charts can help you determine what equipment will work with your application.

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