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PVDF Water Filtration Membranes

Kynar® PVDF solutions for microfiltration and ultrafiltration membranes. Extremely durable. High throughput for the lifetime of the module.

Kynar® Water Filtration Membrane

High Performance

  • Easy processing (both NIPS and TIPS) of hollow fibers
  • Consistent macro-void free structure
  • Tremendous strength, ductility, resilience
  • High gel strength, good spinning stability
  • Uniform pore size and high permeability/throughput
  • Suitable pH range: 1-13
  • Radiation resistance: e-beam, gamma radiation, steam, chemical methods

Extreme Chemical Resistance & Toughness

  • Tremendous resistance to harsh halogenated chemicals (Chlorine, NaOCl bleach, Chlorine dioxide, Chloramines) and acids, peroxides, aromatics, ozone and other oxidants
  • Improved toughness and ductility
  • Less cracking/breaking during turbulent water flow (both outside-in and inside-out/backflush flow conditions) and air-scouring operations

 

The result is a membrane that is more durable, requires less maintenance (less down-time) and is tougher than PSU and PESU alternatives.

EXTREME CHEMICAL RESISTANCE

                                       

Chemical Effect on % Elongation

Kynar® PVDF versus PES and PSU

ControlHCl (pH 1)NaOH (pH 13)NaOCl (3000ppm pH 9.5)Cl water (3000ppm) or NaOCl (pH 6)Br water (3000ppm)
Kynar® PVDF 243 212 230 260 220 190
PES 107 113 93 97 1 1
PSU 200 194 218 150 1 1

*PES and PSU are too brittle to test after Cl and Br exposure

Hollow fiber for water filtration membranes.

Let us save you years of R&D. Allow us to help you optimize your fibers.

  • Model formulation
  • Membrane spinning conditions
  • On-site lab trials, training
  • Field technical support
  • Characterization - physical & chemical
  • Regional support across the globe
Chemical effect on elongation of Kynar® PVDF vs. other materials.

This graph demonstrates the truly exceptional chlorine and bromine resistance of Kynar® PVDF grades. As more and more pressure is placed on municipal and industrial treatment facilities to "do more, with less", there is a greater need for extreme materials that can resist extreme conditions.

 

 

AN EXTREME WORLD NEEDS EXTREME MATERIALS

Longer Lifetime in Halogenated Environments: Life expectancy in Cl- ppm hours for PES is 50,000; Kynar® PVDF is 1,000,000

Durable Hydrophilicity = Higher Throughput Ultrafiltration

In 2016, Arkema was awarded the Pierre Potier innovation award in France for its invention of high throughput hydrophilic Kynar® PVDF grades. This novel development, Kynar® DH100 PVDF incorporates molecular-scale modification of the fluoropolymer surface, resulting in tailored hydrophilicity that promotes higher flow rates and lower fouling rates. The overall throughput of processed water is improved by up to 20% with no increase in energy consumption. Significantly, the surface functionalization is highly durable – both mechanically and chemically, and remains functional for the entire lifetime of the membrane.

Graphical depiction of Arkema water filtration membranes.

The Kynar® DH100 grade offers durable hydrophilicity through a proprietary grafting process whereby hydrophilic blocks on the surface of the PVDF are permanently anchored by copolymerized PVDF-miscible blocks. 

 

Tailored functionalization is a core strength of the Arkema water membrane development center. 

High Throughput After Repeated Cleaning Cycles

Relative permeability of Arkema membranes vs. other membranes.

This graph demonstrates the retention of high throughput (flux) of Kynar® DH100 after repeated washing/backflush cycles compared to two other commercial PVDF membranes. 

 

Select the Right Grade

Depending on the filtration process and specific formulation space, Arkema can recommend several grades.

 

NIPS Flat Sheet

Kynar® 761 (Datasheet US/SI)

Kynar® 761A (Datasheet US/SI)

NIPS Hollow Fiber

Kynar® 761, Kynar® 761A, Kynar® MG15 (Datasheet US/SI), Kynar® DH100 durable hydrophilic grade

TIPS Hollow Fiber

Kynar® 741, Kynar® 761

Each of these grades is completely soluble at 5-20% solids in each of the following solvents at ambient temperature:

 

  • Dimethyl Acetamide
  • N-Methyl-2-Pyrrolidone (NMP)
  • Dimethyl Formamide
  • Dimethyl Sulfoxide
  • Triethyl Phosphate
  • Tetramethyl Urea

A Viscosity to Match Your Process

Typical viscosity in NMP (cps)
 % solids: 10% 15% 20%
Kynar® 761              500            2,000          12,000
Kynar® 761A           1,000            5,000          25,000
Kynar® MG15           1,700            9,500          52,000
Kynar® DH100           2,280          10,000          55,600

 

Typical viscosity in DMAC (cps)
 % solids: 10% 15% 20%
Kynar® 761 220 1000 5500
Kynar® 761A 450 2500 13000
Kynar® MG15 800 4800 25000
Kynar® DH100 840 4000 22030

Regulatory Listings & Approvals

 Certain Kynar® grades are approved for the following regulations. Please speak to your Arkema representative for grade-specific details.

 

ORGANIZATION

 

REGULATION

National Sanitation Foundation (NSF)

 

NSF-61 Potable Water, NSF-51 Food Equipment, NSF-14 Plumbing System Components

Food & Drug Administration (FDA)

 

177.2510 & 177.2600 Repeated Contact with Food, 177.1520 Single-Use Adjuvant for Use in Polyolefins

1% Concentration

United States Department of Agriculture (USDA)

 

Use in Process or Storage Areas to Contact with Meat or Poultry Food Products

3-A Sanitary Standards Inc. (3-A SSI)

 

Multiple-Use Plastic Materials Used as Product Contact Surfaces for Dairy Equipment

United States Pharmacopeia (USP) Class VI

USP Class VI

Chicago Rabbinical Council (CRC)

Kosher Certified

The Challenge for Global Water Supply

Globally, there is an enormous demand for superior / higher efficiency water purification processes. Almost a billion people on the planet do not have easy access to clean drinking water or basic hygiene. The continued drive toward urbanization puts more and more pressure on our ability to make dirty water clean. Simultaneously, agricultural water is being recycled more and more without adequate retreatment – a vicious cycle that puts even more pressure on the filtration challenge.

 

Municipal treatment facilities are forced to do more – often, without the ability to expand their operation. Consequently, they must achieve higher throughput rates – with less down-time and must use harsher and stronger cleaning agents to rehabilitate their fouled membranes.

 

This extreme challenge makes Kynar® PVDF an obvious choice. For decades, Kynar® PVDF has proven itself as a world leading technology in chemical resistance and durability – while being easy to process and install. Engineers all over the world know that Kynar® is a trademark for reliability and peace of mind.

Speak to the Right Person

We understand your challenges and we’re here to help. No matter where on the planet you are, we’ve got resources to help you. Our global Membrane Innovation Center is located in King of Prussia, USA – and we have regional relay technical facilities in France, China, Korea and Japan. Let us help you today with:

 

  • Model formulation
  • Process optimization
  • Membrane spinning conditions
  • Field technical support
  • Physical characterization
  • Co-development
  • On-site lab trials and training

 

See contact form below.

 

 

View and Download Our Water Brochures!

Let's Run Together

Our range of materials is constantly growing.  As the market demands higher performance materials we will continue to develop innovative solutions.  Our global team of engineers is eager to work on new developments and design creative solutions for your material needs.  Contact our team today to start your development.

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