Duo-Fine II Filter Cartridges

Summary

Product identification

Pall Duo-Fine® II Series Filter Cartridges are designed for efficient particle removal in liquid or gas systems.

Key features include:

• Superior filtration performance
• More economical than depth-type cartridges
• Excellent classifying filter
• Optional 100% Bubble Point Testing
• Rigid polypropylene outer cage protects filter media in harsh operating environments
• Available with extended core
• Imprinted for easy identification
• Excellent chemical compatibility

Operating limits

• Recommended Change Out Differential Pressure: 35 psid (2.4 bard)
• Maximum Differential Pressure:
  • 75 psid (5.2 bard) @ 68°F (20°C)
  • 40 psid (2.8 bard) @ 150°F (65°C)
• Sterilization: All cartridges may be autoclaved for 30 minutes at 250˚F (121°C) under no end load conditions.

Product water

• Filter Grades: 0.2, 0.45, 1, 3, 10, 30, 50 µm (nominally rated)

Particle Retention (Liquid Service):

• DFNT 0.2: 90% Efficiency @ 0.2 µm, >99.9% Efficiency @ 1 µm
• DFNT 0.45: 90% Efficiency @ 0.45 µm, >99.9% Efficiency @ 2 µm
• DFNT 1: 90% Efficiency @ 1 µm, >99.9% Efficiency @ 4 µm
• DFNT 3: 90% Efficiency @ 3 µm, >99.9% Efficiency @ 10 µm
• DFNT 10: 90% Efficiency @ 10 µm, >99.9% Efficiency @ 18 µm
• DFNT 30: 90% Efficiency @ 30 µm, >99.9% Efficiency @ 45 µm
• DFNT 50: 90% Efficiency @ 50 µm, >99.9% Efficiency @ 75 µm

Particle Retention (Gas Service by DOP Test):

• DFNT 0.2: 99.999% Efficiency
• DFNT 0.45: 99.998% Efficiency
• DFNT 1: 96% Efficiency
• For DFNT 3, 10, 30, and 50 cartridges, the table is incomplete in the provided extract. See the official PDF for exact tabulated values.

Mechanical / hydraulic

Materials of Construction:

• Filter Media:
  • 50 µm: Spunbonded Polyester
  • All Other Grades: Borosilicate Microfiberglass with Acrylic Binder
• Support Material: Spunbonded Polyester
• Netting: Polypropylene
• Hardware: Polypropylene
• Sealing: Thermal Bond
• Gaskets/O-rings: Silicone Elastomer, Buna N, Viton A, Nordel, FEP Encapsulated Silicone, Expanded PTFE, White Buna N, White Silicone

Dimensions (nominal):

• Outside Diameter: 2 3⁄5" (6.6 cm)
• Lengths: 4" (10.2 cm), 9 3⁄4" (24.8 cm), 10" (25.4 cm), 19 1⁄2" (49.5 cm), 20" (50.8 cm), 29 1⁄4" (74.3 cm), 30" (76.2 cm), 39" (99.1 cm), 40" (102 cm)

Flow Rate: A chart titled "Typical Flow vs. Differential Pressure for Application Sizing" indicates that flow rate is per 10" (25.4 cm) cartridge. For liquids other than water, multiply pressure drop by fluid viscosity (cP). Exact flow rates are presented graphically; please refer to the official PDF for detailed curves.

Ordering Information

The product offers various configurations including filter grades, cartridge lengths, end configurations (e.g., DOE, SOE, extended core, different O-ring styles), gasket/O-ring materials, packaging options, and bubble test options.

Disclaimer: This summary is based on the provided text extract and may not include all figures, footnotes, or the latest revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror