VNF2-8040 NF Membrane
Effective membrane area: 37.2㎡
Desalination rate: 97%
Water production: 39.7 m³/day
Maximum water inlet pressure: 4.14 Mpa
Influent PH value range: 3-10
Maximum inlet water turbidity: 1.0 NTU
VNF2-8040 Nanofiltration Membrane
High-Rejection NF Membrane for High-Purity Water Applications
The VNF2-8040 is a high-performance nanofiltration membrane element designed for large-scale industrial and municipal water treatment systems.
Engineered for high salt rejection and stable operation, VNF2-8040 delivers near-reverse-osmosis-level desalination while maintaining the operational advantages of nanofiltration technology.
It is ideal for applications requiring strong removal of both divalent and monovalent salts.
Key Performance Features
- ≥95% rejection of sulfate (SO₄²⁻)
- ≥95% rejection of sodium chloride (NaCl)
- High removal of organics and hardness
- Designed for high-purity water production
- Stable performance under continuous operation
- Suitable for 8-inch industrial membrane housings

VNF2-4040 and VNF2-8040 Technical Specification Comparison
| Model | VNF2-8040 | VNF2-4040 | ||
| Type | Size | 8*40 inch | 4*40 inch | |
| Membrane material | Aromatic polyamide composites | |||
| Effective membrane area | ft2 | 400 | 90 | |
| m2 | 37.2 | 8.4 | ||
| Thickness of water inlet screen | 32 mil | |||
| Performance | Desalination rate (%) | 92-97 | ||
| Water production (GPD) | 10,500 | 2,400 | ||
| Test Conditions | NaCl solution concentration | 500 mg/L | ||
| Pressure | 75 psi (0.52 Mpa) | |||
| Temperature | 25℃ | |||
| Recovery rate of a single membrane element | 15% | |||
| Test solution pH value | 6.5-7.0 | |||
| Conditions of Use | Maximum water inlet pressure | 600 psi (4.14 Mpa) | ||
| Maximum water inlet flow | 75 GPM (17 m3/h) | 16 GPM (3.6 m3/h) | ||
| Maximum water inlet temperature | 45℃ | |||
| Influent PH value range | 3-10 | |||
| Cleaning PH range | 1-12 | |||
| Maximum inlet water turbidity | 1.0 NTU | |||
| Maximum water inlet SDI | <5 | |||
| Maximum pressure drop of a single membrane element | 10 psi (0.07 Mpa) | |||
Advantages of 8040 Size Configuration
Compared to 4040 elements, the 8040 configuration:
- Provides significantly higher membrane area
- Reduces system footprint per unit flow
- Lowers installation quantity for large projects
- Improves cost efficiency in large-scale systems
VNF2-8040 is especially suitable for medium to large industrial systems.
Supply & Technical Support
Xi'an Ink-blue Environmental Protection Technology Co., Ltd. supplies genuine Vontron VNF2-8040 membrane elements for global markets.
We provide:
- Bulk supply for industrial projects
- Technical selection support
- Export logistics coordination
- System matching consultation
Anti-counterfeiting verification is available for genuine products.


everything you may want to know about INK-BLUE
A comprehensive supplier of water treatment equipment integrating design, production, sales, and installation. The product line includes a complete set of water treatment systems, RO membranes, membrane housings, FRP pressure vessels, filter elements, filter cartridge housings, etc. Ink-blue Environmental Protection Technology has a team of engineers who can design and provide customers with targeted water treatment solutions based on actual conditions. Of course, we can also manufacture products according to customers' drawings or samples.
Our customers are worldwide, mainly in the Middle East, Asia, Africa and Europe. The business scope covers various industries such as drinking water production and treatment, sewage treatment, seawater desalination, medical, pharmaceutical, food, beverage, chemical, agricultural irrigation, etc. Ink-blue Environmental Protection Technology has won an excellent reputation in the water treatment industry with high-quality products and perfect pre-sales and after-sales services.
Team composition
We have a team of engineers who can tailor water treatment solutions for customers, and we can also produce products according to the drawings provided by customers.
7x24 hours delivery
Quote within 24 hours, CAD or design drawings within 72 hours, and respond quickly to customer needs.

20%
Engineer team proportion
800+
Customers served
70%
Export proportion
$3M+
Annual sales
Certifications

ASME

CE

ISO9001

ISO14001

NSF

Test report
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