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    Breathable Films

    Monolithic films that are impervious to liquids (water) but permeable to gases (water vapor).

    Breathable film with water droplets

    Watch the webinar recording

     

    Monolithic & Breathable

    Certain Pebax? polymer grades are inherently breathable when extruded alone or in combination with otherwise non-breathable resins.

     

    Through very careful choice of proprietary polyether block chemistry within the Pebaxpolymer backbone, a continuous molecular channel may be achieved that allows physical transport of water vapor molecules while simultaneously blocking any transport of liquid water. 

     

    Unlike perforated or microporous films, monolithic films made from Pebax polymers do not rely on vapor transport through holes or voids (which enables physical transport in both directions). 

     

    The moisture vapor transmission rate (MVTR) of the final film may be finely tuned by varying the level of Pebax? polymer within the host material (usually functional polyolefin). 

     

    Typical Applications

    • Medium, High Perm Housewrap
    • Surgical Gowns, Bed Encasements
    • Surgical Drapes, Masks, Gloves
    • Mattress, Pillow Protectors
    • Packaging
    • Waterproof Apparel

    Monolithic films also ensure better odor barrier properties and protect against gradual loss of overall performance due to plugging.

    Choose the Right Grade

    There are three grades of Pebax? offered for breathable/hydrophilic applications:

     

    Pebax? MH 1657: Higher melt point, Higher melt strength 

    (Datasheet US/SI)

    Pebax? MV 1074: Higher transparency, Lower melt point, Good sealability (Datasheet US/SI)

    Pebax? MV 3000: Softer touch, Easy to process, Translucent 

    (Datasheet US/SI)

     

    Each grade is tailored in its performance according to the careful selection by Arkema of the polyether and polyamide blocks in the Pebax? polymer backbone:

    Pebax Diagram of Polyamide and Polyether

    MVTR (Moisture Vapor Transmission Rate) 15 micron Film - g/m2 per day - Typical Values

      ASTM E-96 50% RH, 23° C 50% RH, 38° C 90% RH, 23° C 90% RH, 38° C
    Pebax? MH 1657 B Method                 1,900                 4,000                     650                 1,300
      E Method                     500                 1,600                 1,500                 3,100
      BW Method               13,700               19,000                 4,400                 6,200
    Pebax? MV 1074 B Method                 1,900                 4,000                     650                 1,300
      E Method                     500                 1,600                 1,500                 3,100
      BW Method               13,700               19,000                 4,400                 6,200
    Pebax? MV 3000 B Method                 1,900                 2,900                     650                 1,300
      E Method                     300                 1,600                 1,500                 3,100
      BW Method               13,700               19,000                 3,300                 6,200

    B Method: Upward evaporation through film; E Method: Dessicant absorption through film; BW Method: Inverted water transfer vthrough film  

    Typical Physical Properties

      Pebax? MH 1657 Pebax? MV 1074 Pebax? MV 3000
    MP °C 204 158 158
    Density g/cc 1.14 1.07 1.02
    Flex Modulus Mpa 80 80 45
    % Elongation @ Break >500 >700 >450
    % Water Absorption 20°C, 50% RH 4.5 1.4 1
     
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