How does thermoplastic polyurethane film achieve both liquid resistance and water vapor permeability?

Thermoplastic polyurethane film is a strong, durable, and flexible elastomer known for its excellent wear resistance, high strength, toughness, chemical resistance, hydrolysis resistance, mold resistance, low-temperature flexibility, transparency, and color stability. TPU processing is highly versatile, allowing it to be used in various applications.

TPU films are widely recognized for their waterproof and breathable properties, often referred to as "breathable waterproofing." They are commonly used in outdoor apparel such as mountaineering jackets, windbreakers, hoodies, and seamless undergarments. TPU-based composite fabrics provide comfort and breathability, keeping wearers cool even in hot summer conditions.

TPU films can resist liquid penetration while allowing high water vapor permeability. This is achieved thanks to their special molecular structure. TPU films are non-porous hydrophilic membranes that use hydrophilic groups to transport water molecules from the side with higher vapor pressure to the side with lower vapor pressure. As a result, TPU films are both waterproof and breathable, providing excellent moisture management.

The high elasticity of TPU films ensures a close fit to the body, adapting well to different surfaces while maintaining comfort. Their breathability allows the skin to "breathe," reducing the risk of irritation or allergies.