I. Product Definition

Breathable Membrane ( Breathable Film / Membrane ) is a high-polymer functional film that combines gas permeability and liquid barrier properties. It allows air, water vapor, and other gases to pass through while blocking water, dust, and bacteria, achieving waterproof, dustproof, breathable, and moisture-permeable functions. It is widely used in medical, packaging, construction, textile, and automotive industries.

II. Product Advantages

Breathable and waterproof: discharges water vapor in high-humidity environments, preventing mildew and deterioration, while effectively blocking liquid from entering.

Dustproof and antibacterial: effectively filters dust and microorganisms, maintaining cleanliness within the system.

Extended service life: protects components or packaged contents, reducing the loss rate.

High-temperature adaptability: Some products can withstand temperatures above 100 ℃, suitable for harsh environments.

Environmentally friendly and non-toxic: Complies with FDA 、 REACH 、 ROHS and other environmental standards; can be used in food and medical applications.

Adjustable performance: Air permeability, waterproof level, pore size, etc., can be customized as needed.

III. Product Characteristics

Characteristics   Description

Material Composition   Mainly uses PE 、 ePTFE 、 PU 、 PP and other high-polymer materials

Breathable Method   Microporous structure /  Molecular diffusion type breathability

Waterproof Level   IP67 ~ IP68 level, some can reach IP69K

Type Classification   Membrane body film, composite film (membrane + Non-woven fabric / mesh), pressure-sensitive film, porous film, etc.

Strong Composite Ability   Can be combined with non-woven fabrics, textiles, and films to increase mechanical strength

IV. Technical Parameters (Reference Values)

Parameter   Range (Conventional Value)

Thickness   0.01mm ~ 0.08mm 

Air Permeability   100 ~ 10,000 ml/min · cm 2 (Customizable)

Water Vapor Transmission Rate ( WVTR )   500 ~ 10,000 g/m 2· 24h (Varies with temperature and humidity conditions)

Waterproof Grade   IP67 / IP68 / IP69K 

Pore Size Range   0.1 ~ 10 Micron (μ m )

Tensile Strength   ≥ 20 MPa

Operating Temperature   -40 ℃ ~ 120 ℃ (depending on the material)

Surface Tension (Hydrophilic / Hydrophobic)   Customizable treatment

V. Application Range

Medical and hygiene industry: breathable functional layer for products such as band-aids, surgical gowns, masks, infusion patches, and urinary bags.

Medical packaging breathable membrane (combines sterilization, breathability, and antibacterial functions)

Intelligent Electronics and Packaging Industry

Waterproof and breathable vents for electronic devices: such as Mobile phones, sensors, LED lights, and in-vehicle cameras;

Food packaging bags: venting, anti-inflation, and anti-fog freshness preservation;

Chemical packaging barrel vents, explosion-proof drums.

Construction Industry

Roof / Exterior wall / Ground breathable waterproof membrane, prevents water vapor penetration while allowing moisture to permeate and vent;

Moisture control layer in insulation systems (anti-condensation / anti-mildew).

Automotive Manufacturing

Waterproof and breathable membranes for automobile headlights, taillights, and control boxes;

Pressure difference balance membrane for power battery pack housing.

Textiles and Outdoor Products

Waterproof and breathable clothing, footwear, tents, and backpack fabrics;

Functional layer materials for ski wear, jackets, and raincoats.

VI. Production Process

Raw material melt extrusion

Selection of PE 、 ePTFE 、 PU Thermoplastic materials, combined with functional masterbatches (such as titanium dioxide, calcium carbonate) for granulation.

Film Casting or Blown Film Forming

Forming films through casting, biaxial stretching, or blowing.

Microporous Forming Process

Using techniques such as filling and stretching, thermal pressing, laser micro-drilling, and electrostatic spraying to create a microporous structure.

Composite Processing

Composite with non-woven fabrics, paper, nylon fabrics, etc. to enhance mechanical properties.

Surface Treatment

Hydrophilic, hydrophobic, anti-static, and antibacterial coating treatments according to the application.

Slitting and Rewinding

Precise cutting and packaging of films, sheets, or die-cut products according to customer size.

VII. Market Competitive Advantages

Functional composite products: Combining waterproof, dustproof, and breathable functions, replacing multiple processes.

Wide range of applications: Covering packaging, medical, electronics, and textile industries.

High standards and barriers to entry: Many products require IP level certification, FDA and other quality systems, increasing the barriers to entry.

Strong customization capabilities: Pore size, air permeability, and waterproof level can be adjusted according to requirements.

Environmental regulations promote development: Recyclable and biodegradable films are becoming increasingly popular, with strong policy support.

VIII. Future Development Trends

High-functionality development

Developing towards high moisture permeability, antibacterial, antiviral, anti-static, and multi-functional integration.

Combination of Micro-Nano Technology

Applying nanopore control technology to create more precise gas permeability performance.

Biodegradable and Eco-friendly Materials

Development of PLA based, PBAT based environmentally friendly breathable films to adapt to the global trend of sustainable packaging.

Intelligent Breathable Membrane

Membrane materials combined with temperature and humidity control technology can automatically adjust pore opening and closing according to environmental conditions.

Highly Integrated Die-Cutting Solutions

Highly integrated with die-cutting, electronic bonding, and laser cutting processes to provide one-stop customized services.

Globalization

With the export of electronic products and medical protective products increasing, the global market for breathable membranes is rapidly expanding.