The Filmtec NF-4040 nanofiltration membrane delivers 6,800 GPD of high-selectivity filtration in an 8"x40" commercial format, designed to reject organic compounds above 200 molecular weight while allowing monovalent salts to pass through. With 82 sq ft of active membrane area and stabilized rejection rates exceeding 99% for magnesium sulfate, this element handles demanding process applications including desalting, acid processing, metal recovery, and antifreeze reclamation.
SPECIFICATIONS
Filmtec NF-4040 Nanofiltration Element
Permeate Flow
6,800 GPD
7.4 m³/day nominal
Dimensions
8" × 40"
Standard commercial fit
Active Area
82 sq ft
7.6 m² membrane surface
Salt Rejection
>99%
98% minimum for MgSO₄
Rejection Cutoff
200 MW
Organics molecular weight
Configuration
Spiral Wound
Durable element design
TECHNICAL DETAILS
Performance Parameters & Test Conditions
| Test Pressure |
130 psig (8.9 bar) |
| Test Solution |
2000 ppm Magnesium Sulfate (MgSO₄) |
| Operating Temperature |
77°F (25°C) standard test conditions |
| pH Range |
pH 8 (test standard) |
| Recovery Rate |
15% recovery at test conditions |
| Target Flow (New Element) |
1,950 gpd (7.4 m³/d) baseline |
| Replaces |
Filmtec NF45 series elements |
COMPATIBILITY & APPLICATIONS
Where the NF-4040 Membrane Works
The Filmtec NF-4040 nanofiltration membrane is engineered for commercial and industrial process applications requiring selective separation of dissolved solutes. It excels in desalting organic compounds, acid processing environments, metal ion recovery from waste streams, and antifreeze recovery operations. The membrane's unique selectivity allows it to reject divalent salts and larger organic molecules while permitting monovalent salts to pass, making it ideal for applications where complete desalination is not required but targeted separation is critical. Flow rates will vary based on feedwater chemistry, temperature, pressure, and specific process conditions. This element fits standard 8-inch commercial housings and is compatible with systems previously using Filmtec NF45 membranes.
💧 Nanofiltration membranes operate at lower pressures than RO elements and provide selective separation rather than total dissolved solids removal. Actual permeate flow on your process stream will differ from test conditions based on feed composition, temperature, and operating pressure. Filmtec periodically updates specifications for product improvement, so verify current performance data for critical applications.
