BOS Max Filter Bags

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Pall FSI Seamless-Absoluted Rated Filter Bags

BOS Max Filter Bags

The innovative BOS Max Filter Bags are a heavy duty seamless filter bag that have an advanced design that provides extended life and increased efficiency with a greater depth filtration than conventional filter bags. It provides all of the benefits of the standard BOS filter bag with a semi-rigid microfiber insert that increases the dirt holding capacity of the filter while providing the absolute filtration of the BOS filter bag.


  • BOS MAX Heavy Duty Extended Life Bags contain a semi-rigid, microfiber cartridge insert for up to four times the life of standard BOS bags and are ideal for high-purity applications.
  • Absolute rated 3-100 microns for high efficiency and consistent quality.
  • Thermally-bonded microfibers contain no sizing, bonding adhesive, resin or silicone.
  • Contaminant free to eliminate craters providing better surface results.
  • PolyLoc® ring creates hermetic seal within a vessel housing to prevent liquid bypass.

Available Materials

  • Polypropylene


  • Seamless Construction

Maximum Operating Temperature

  • 160° F (71° C)

Suggested Differential Pressure

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

Absolute (98%) Micron Rating

  • 3, 5, 10, 25, 35, 50, 75, 100


  • #1: 7” x 16” (17.8 cm x 40.65 cm)
  • #2: 7” x 32” (17.8 cm x 81.3 cm)

Other Specifications

  • Plastic PolyLoc® Rings
BOS = Seamless Polypropylene
Micron Rating
See specifications
PM = Polypropylene
1, 2
P = Polypropylene PolyLoc®
MAX = Maximum life