4"x40" | Full-Fit | Sanitary| 2,400 GPD | FilmTec RO Membrane

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Brand DOW Filmtec
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RO-4040-FF is currently out of stock. We can process special orders with a lead time of approximately 3 weeks. Potential alternative: HSRO-4040-FF is in stock for immediate shipment at reduced pricing.

DOW FilmTec Membrane Elements

DOW FILMTEC™  RO-4040-FF Sanitary-Grade Full-Fit Elements for Sanitary Applications

DOW FILMTEC RO-4040-FF elements deliver high flux and outstanding quality water for applications requiring sanitary-grade membrane elements. The full-fit configuration minimizes stagnant areas and is optimal for applications requiring a sanitary design. All materials of construction are compliant with U.S. Food & Drug Administration indirect food contact requirements and are suitable for use in food processing applications in the U.S.

Product Specifications

DOW FILMTEC RO-4040-FF is FDA – 21 CFR 177.2550; Food and Drug Administration Compliant.

FilmTec Membranes are FDA Compliant     Genuine DOW FilmTec Membrane Element   


Benefits of DOW Full-Fit RO Elements:

  • High flux results in high yields
  • Full-Fit Sanitary-Grade Design
  • Consistant FilmTec performance and quality from automated rolling

Specifications for RO-4040-FF

FilmTec Product: RO-4040-FF
FilmTec Part Number: 84286
Replaces Part Numbers: BW30-4040-LW
Size (Approximate): 4" Dia. x 40"L
Flow Rate: 2,400 gpd (9.1 m³/d)
Applied Pressure: 225 psig (16 bar)
Stabilized Salt Rejection: 99.5%
Minimum Salt Rejection: 98.0%
End Style/PWT: Male PWT, 0.75 OD
Exterior: Cage-Wrapped
Product Type: Spiral-Wound Element 
Membrane Type: Thin-Film Composite 

Permeate flow and salt rejection based:  32,000 ppm NaCl feed stream, 5ppm boron, 77°F, 8% recovery, 800 psig, pH 8.


Operating Limits for RO-4040-FF

Maximum Operating Temperature: 113°F (45°C)
Maximum Operating Pressure: 600 psig (41 bar)
Maximum Pressure Drop: 15 psig (1 bar)
Maximum Feed Turbidity: 1 NTU
pH Range, Continuous Operation: 3-10
pH Range, Short-Term Cleaning*: 1-12
Maximum Feed Silt Density Index: SDI 5
Fere Clorine Tolerance: 0

*Refer to cleaning guidelines.

Common Applications for FilmTec RO-4040-FF Sanitary-Grade Elements:

  • Medical Applications
  • Sanitary Uses
  • Food Pocessing

Physical Dimensions of DOW FilmTec RO-4040-FF

DOW FilmTec Full Fit Sanitary RO Membrane Drawing  
A 40.0 (1,016)
B 0.75 (19)
C 3.9 (99)

RO-4040-FF fits nominal 4x40 size pressure vessels.

Common Applications for FilmTec RO-4040-FF Sanitary-Grade Elements:

  • Medical Applications
  • Sanitary Uses
  • Food Pocessing
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