2.5"x40" | DuPont FilmTec NF270 Nanofiltration Membrane | Medium Hardness Passage

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Brand DOW Filmtec
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Note that DuPont has acquired DOW FilmTec with significant cost increases. We continue to offer DuPont elements but we also recommend AMI Membranes as the preferred alternative. AMI Membranes are Made-In-USA with a large inventory in stock for immediate shipment & are competitively priced.

DOW FilmTec Membrane Elements

DOW FILMTEC™  NF270-2540 Nanofiltration (NF) Membrane Elements for Commercial Systems

DOW FILMTEC™ NF270-2540 Elements are ideal for removing a high percentage of TOC and THM precursors with medium to high salt passage and medium hardness passage in commercial systems. The NF270 nanofiltration membrane is an ideal choice for surface water and ground water where good organic removal is desired with partial softening. DOW FILMTEC NF270-2540 elements are tape-wrapped.

DOW FILMTEC NF270-2540 is FDA – 21 CFR 177.2550; Food and Drug Administration Compliant.

Product Specifications


FilmTec Membranes are FDA Compliant     Genuine DOW FilmTec Membrane Element   

Common Applications for FilmTec NF270-2540 Nanofiltration Elements:

  • Production of Municipal Drinking Water
  • Demineralization in Small Commercial Applications

Specifications for NF270-2540

FilmTec Product: NF270-2540
FilmTec Part Number: 149982
Size (Approximate): 2.5" Dia. x 40"L
Flow Rate: 850 gpd (3.2 m³/d)
Applied Pressure: 70 psig (4.8 bar)
Stabilized Salt Rejection: >97%
Single Element Recovery: 15%
Exterior: Tape-Wrapped
Membrane Type:
Polyamide Thin-Film

Permeate flow and salt rejection based:  2,000 ppm MgSOfeed stream, 77°F, 15% recovery, 70 psig.

Operating Limits for NF270-2540

Maximum Operating Temperature: 113°F (45°C)
Maximum Operating Pressure: 600 psig (41 bar)
Maximum Pressure Drop: 13 psig (0.9 bar)
Maximum Feed Flow Rate: 6 gpm (1.4m³/h)
pH Range, Continuous Operation*: 2-11
pH Range, Short-Term Cleaning**: 1-13
Maximum Feed Silt Density Index: SDI 5
Fere Clorine Tolerance***: <0.1ppm

*Maximum temperature for continuous operation above pH 10 is 95°F
**Refer to cleaning guidelines.
***Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure. Since oxidation damage is not covered under warranty, Dow recommends removing residual free chlorine by pretreatment prior to membrane exposure.

Related Products for use with NF270-2540

PV2540PVCAU PVC Membrane Housing Pressure Vessel for 2.5" x 40" Membrane Element
PV2540SSAU-316 Stainless Steel Membrane Housing Pressure Vessel for 2.5" x 40" Membrane Element
PV2540SSAW-316 Stainless Steel  End-Clamp-Style Membane Housing Pressure Vessels for 2.5" x 40" Membrane Elements
PV-IN410 Interconnector Coupler for Installing Multiple Elements in a housing - FilmTec part # 89055.   Includes two o-rings.

Benefits of DOW FilmTec Commercial NF Membranes

  • Good organic (NOM) removal
  • Partial softening preserves water character
  • High flux results in high yields
  • Low energy usage reduces power consumption and costs
  • FilmTec performance and quality

Physical Dimensions of DOW FilmTec NF270-2540

DOW FilmTec Commercial NF Membrane Drawing  
A 40.0 (1,016)
B 1.19 (30)
C 0.75 (19)
D 2.4 (61)

NF270-2540 Fits nominal 25x40 size pressure vessels.

For more information, please visit this products webpage.