NF membrane has a molecular weight cut-off between 200-800 Dalton usually. It is generally targeted to remove only divalent and larger ions. Monovalent ions such as sodium and chloride will pass through a nanofiltration membrane, therefore many of its uses involve groundwater softening, de-salting of the process stream. NF membrane is also becoming more widely used in food processing applications such as dairy, for simultaneous concentration and partial (monovalent ion) demineralisation. NF membrane operation press is around 3.5-30 bar.




We provide spiral nanofiltration membranes, DOW NF270 nanofiltration membrane is an ideal choice for surface water and ground water where good organic removal is desired with partial softening.  We using DOW NF270 flat sheet membrane for water soft. The performance is satisfied. NF270 MWCO:300-400 Dalton. We have standard size like 2540 NF membrane, 4040 NF membrane, 8040 NF membrane. Also, we can make small size 1812 for lab test.

Decoding of the product code: SS-NF1-2540-F1

NF Products
With a pore size between 0.1-10nm, Nanofiltration membranes allow water and some salts to pass through the membrane while retaining multivalent ions, low molecular weight molecules, sugars, proteins, and other organic compounds. 

After years of research and development, We can offer different molecular weight NF membranes to meet a wide range of industiral separation processes.

Our NF5 has excellent MgSO₄ and lactose rejection,which can be used for dairy industry. Nanofiltration membranes overall are also able to greatly reduce levels of hardness, nitrates, sulfates, tannins, turbidity, color, TDS, and moderate levels of salt from feed water streams.


Our NF membrane specifications

NF1-NF3 test condition: 2,000ppm MgSO4, 70psi(0.48MPa), 25ºC;                        
NF4, NF5, NF7, NF8  test condition: 2,000ppm MgSO4, 110psi(0.76MPa), 25ºC;                        
NF6 test condition: 2,000ppm NaSO4,  142psi(1.0MPa), 25ºC.    


APPLICATION                    
Water softening                    
Precious metal recovery                    
Concentration of protein, amino acid, vitamin in food, beverage and pharmaceutical industry         
Acid/caustic recycling                    
Dye color removal                    
Heavy metal separation of waste water
Removal of natural organic matter in water and wastewater treatment
Reduction of hardness in water purification
Sulfate removal from seawater and chemical processes
Desalting of process streams in various industries

Operation Conditions:
Maximum Operating Temperature: 113°F (45°C)
Maximum Operation Pressure: 600 psi (41 bar)  
Maximum Pressure Drop: 15 psi (0.9bar)
Maximum Feed Silt Density Index: SDI 5
Free Clorine Tolerance: <0.1ppm
Operating pH Range: 2.0 - 11.0
pH Range, Short-Term:2-11


Cross Replacement Refer: