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        Kynar? 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 Kynar? PVDF for High Performance Membrances

        • 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

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        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

        A graphical depiction of Kynar? PVDF water filtration membranes with a hydrophilic copolymer

        Graphical depiction of Kynar? PVDF water filtration membranes with hydrophilic copolymers.

        Kynar? resin 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

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

         

        Select the Right Grade of Kynar? PVDF for NIPS or TIPS

        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)

        TIPS Hollow Fiber

        Kynar? 741 (Datasheet US/SI), 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

         

         

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

         

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        Kynar? Grade Viscosity in NMP

        10%20%30%
        Kynar? MG15 500010000800000
        Kynar? 761A 4000800040000
        Kynar? 761 800250011000

        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!

         
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