What Applications Need RO 4040 Membranes?
Thin-Film Composite
Polyamide RO Membrane
RO Membrane 4040
Commercial-grade TFC polyamide -- Model: JZ-RO-4040
Stop Replacing Filters So Often — Switch to a Better Solution
Commercial RO systems need consistent high-quality permeate. Low-quality membranes cause salt passage, frequent cleaning, and shortened element life.
High-rejection TFC polyamide RO membrane 4040 (4x40 inch). 99.5% salt rejection, 200-300 GPD flow rate. Compatible with standard 4-inch pressure vessels. FDA-compliant materials for potable water.
Commercial RO systems, bottled water production, light industrial process water, hospital dialysis water, small desalination units.
Bottling plant achieved 15% higher recovery rate. Hospital maintained consistent water quality for dialysis with 18-month element life.
Applications
The 4040 RO membrane element features thin-film composite (TFC) polyamide construction with 200 to 300 GPD output and 99.5 percent salt rejection rate. Designed for brackish water desalination, tap water purification, industrial water treatment, and commercial RO systems. Standard 4-inch by 40-inch, compatible with most RO pressure vessels.
Key Features
- High Salt Rejection -- 99.5% nominal for brackish water
- TFC Polyamide -- Thin-film composite membrane technology
- Standard Size -- 4.0" x 40" fits industry-standard vessels
- Consistent Output -- 200-300 GPD per element
- Durable Construction -- Fiberglass wrap with male adapter
- Wide pH Range -- 2-11 continuous, 1-13 cleaning
Technical Specifications
| Parameter | Specification |
|---|---|
| Element size | 4.0" x 40" (101.6 x 1016 mm) |
| Active membrane area | 85 ft² (7.9 m²) |
| Membrane type | TFC polyamide thin-film composite |
| Permeate flow rate | 200-300 GPD (0.3-0.5 m³/h per element) |
| Stabilized salt rejection | 99.5% nominal / 99.0% minimum |
| Max operating pressure | 600 psi (4.1 MPa) |
| Max operating temperature | 45 °C (113 °F) |
| pH range | 2-11 continuous / 1-13 short-term cleaning |
| Max feed flow | 16 GPM (3.6 m³/h) |
| Max feed SDI | 5 |
| Max feed turbidity | 1 NTU |
| Free chlorine tolerance | <0.1 ppm |
| Outer wrap / connections | Fiberglass wrap; standard 4" male adapter |
How Is a “4040” Element Written?
Buyers, drawings and quotations describe the same element in several ways, and search terms follow. The 4040 element is a 4-inch diameter, 40-inch long membrane, and it also appears as:
| Written as | Where you see it |
|---|---|
| 4040 | The standard industry shorthand, and how we list it |
| 4" x 40" | Specification sheets and datasheets |
| 4x40 or 4 x 40 | Handwritten notes and search terms |
| 4 by 40 / 40 inch | Spoken and written out in full |
| RO 40 | Shorthand search term for the 40-inch element |
If you are searching for a 4x40 membrane or an RO 40 element, this is the element you are looking for. The 40-inch length is the same on the 4040 and 8040 — only the diameter differs. See the 4040 vs 8040 comparison if you are choosing between the two.
Price Guide
| Element | Indicative FOB China price | Notes |
|---|---|---|
| 4040 brackish water | $80 - $150 per element | Volume pricing applies from 50 pieces |
| BW-4040 high rejection | $120 - $180 per element | For higher feed TDS |
| Seawater (SWRO) 4040 | Quoted per project | Higher pressure construction |
Prices are indicative FOB China and depend on grade, quantity and current membrane pricing. Request a quotation for current pricing and lead time — we reply within 24 hours.
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