PolyFold Filter Bags

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Pall FSI Felt Filter Bags

PolyFold Filter Bags

The PolyFold Filter Bags are our proprietary filter bag constructed of dual-sided extended life felt. It features 2.4X additional surface area for high dirt-holding capacity and long service life.


  • The dual-sided, extended life felt construction provides maximum dirt holding and a high flow rate.
  • 240% more surface area than a standard bag.
  • Fits in a standard basket, so no retrofit is required.
  • 4X+ dirt holding capacity* results in longer life and fewer change outs.
  • Polypropylene center tube supports filtration media, aids in insertion of filter bag, and accepts a bag magnet.
  • PolyLoc® ring eliminates liquid bypass.
  • Mesh cover assists in insertion and removal of filter bag.


*Compared to a standard felt bag. Based on lab testing using water and test dust.

Specifications for PolyFold Filter Bags

Available Materials

  • Polypropylene Extended Life Felt

Maximum Operating Temperature

  • 200-220° F (93-104° C)

Suggested Differential Pressure

  • 35 PSIG maximum — dirty
  • 10-15 PSIG optimum change out

Micron Rating

  • 5, 10, 25, 50, 100


  • #2: 7” x 32” (17.8 cm x 81.3 cm)

Other Specifications

  • Polypropylene PolyLoc® Rings
  • Polypropylene Center Tube
Type of Filter
B = Filter Bag
POF = Polypropylene extended life felt
Micron Rating
See specifications
P400 = Polyester Multifilament Mesh (400 Micron)
P = Polypropylene PolyLoc®