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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

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 Pebax® polymer 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

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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