What is Breathable film

Breathable film, also known as breathable membrane or breathable fabric, is a functional material that allows the passage of air and water vapor while effectively blocking liquids. This dual capability makes it an essential component across various industries, including construction, healthcare, and performance apparel. The film is typically manufactured using microporous materials like polyethylene (PE) or polypropylene (PP), which feature pore sizes engineered to maintain moisture control without sacrificing barrier performance.

Applications Across Industries

• In the construction sector, breathable membranes are installed beneath roofing or cladding systems. These films enable moisture vapor from inside the building to escape while preventing rainwater intrusion from the outside. This contributes to long-term structural integrity by reducing the risk of condensation, mold, and material degradation in wall cavities and insulation layers.
• Within the medical field, breathable films play a vital role in surgical drapes, wound dressings, and disposable garments. Their ability to allow airflow while maintaining a sterile barrier supports patient comfort, healing efficiency, and infection control.
• For outdoor clothing and functional textiles, breathable waterproof fabrics are used in garments such as raincoats, ski jackets, and hiking gear. These membranes repel external moisture like rain and snow, while permitting internal perspiration to escape, keeping users dry and comfortable during active use.

Material Composition and Technology

Breathable films are typically made from microporous polyethylene (PE) or polypropylene (PP) through specialized processes such as extrusion or lamination. The micropores are small enough to block liquid molecules but large enough to let water vapor and air pass through. This careful balance between breathability and water resistance is achieved without the need for chemical coatings, making it more environmentally friendly and recyclable.

Leading manufacturers like Kae Hwa Industrial Co., Ltd. produce breathable films in a variety of configurations and weights to meet the specifications of over 30 industries worldwide. From large-scale building wraps to medical-grade hygiene layers, the adaptability of these membranes makes them indispensable across multiple fields.