Kynar® PVDF Water Filtration Membranes
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.
View and Download Our Water Brochures!
Kynar® PVDF: High Performance Choice for Water Filtration Membranes Brochure
High Performance Kynar® PVDF for High Performance Membranes
- 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
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Improved toughness and ductility
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Less cracking/breaking during turbulent water flow (both outside-in and inside-out/backflush flow conditions) and air-scouring operations
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The result is a membrane that is more durable, requires less maintenance (less down-time) and is tougher than PSU and PESU alternatives.
Chemical Effect on % of Elongation of Kynar® PVDF versus PES and PSU
*PES and PSU are too brittle to test after Cl and Br exposure
Longer Lifetime in Halogenated Environments: Life expectancy in Cl- ppm hours for PES is 50,000; Kynar® PVDF is 1,000,000
The graph on the left shows the outcome of the chemical resistance test, where Kynar® PVDF, PolySulfone (PSu) and PolyEtherSulfone's (PES) elongation was measured after 2 weeks of exposure to various chemicals. As seen in the graph, the data for PSu and PES is missing for bromine water and chlorine water, because the samples were damaged due to exposure and the elongation measure became impossible.
Chemical exposure test result images: Kynar® PVDF vs PSu and PES
Kynar® PVDF samples after 2 weeks of exposure in 3000 ppm bromine water (left) and 3000 ppm chlorine water (right)
PolySulfone (PSu) samples after 2 weeks of exposure in 3000 ppm bromine water (left) and 3000 ppm chlorine water (right)
PolyEtherSulfone (PES) sample after 2 weeks of exposure in 3000 ppm bromine water (left) and 3000 ppm chlorine water (right)
Our hollow fiber expertise
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
A blend of Kynar® resin and block copolymer made via Controlled Radical Polymerization
Kynar® Innovation is the technology patented by Arkema and the membrane manufacturing partner Polymem. Kynar® resin offers durable hydrophilicity through a proprietary grafting process whereby copolymerized PVDF-miscible blocks permanently anchor hydrophilic blocks on the surface of the PVDF.
Tailored functionalization is a core strength of the Arkema water membrane development, which results in a long-lasting low-fouling effect and stable performance through a lifetime of chemical cleaning.
Regulatory Listings & Approvals
Certain Kynar® grades are approved for the following regulations. Please speak to your Arkema representative for grade-specific details.
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ORGANIZATION |
REGULATION |
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National Sanitation Foundation (NSF)
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NSF-61 Potable Water, NSF-51 Food Equipment, NSF-14 Plumbing System Components |
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Food & Drug Administration (FDA)
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177.2510 & 177.2600 Repeated Contact with Food, 177.1520 Single-Use Adjuvant for Use in Polyolefins 1% Concentration |
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United States Department of Agriculture (USDA) |
Use in Process or Storage Areas to Contact with Meat or Poultry Food Products |
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3-A Sanitary Standards Inc. (3-A SSI) |
Multiple-Use Plastic Materials Used as Product Contact Surfaces for Dairy Equipment |
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United States Pharmacopeia (USP) Class VI |
USP Class VI |
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Chicago Rabbinical Council (CRC) |
Kosher Certified |
Water Membrane Case Studies
Kynar® & Adheflon®51H additive for water membranes Case studies
KYNAR® & ADHEFLON®51H FOR INDUSTRIAL PROCESS WATER TREATMENT IN LUXEMBOURG
KYNAR® & ADHEFLON®51H FOR SEAWATER ULTRAFILTRATION
Kynar® MG15/ G150 Case studies with Akkim
KYNAR® MG15 FOR ISTANBUL AIRPORT WASTE WATER REUSE PLANT
KYNAR® MG15 FOR WASTE WATER RECOVERY IN A TEXTILE PRODUCTION PLANT