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Breathing paper (also known as waterproof breathable film, Dike waterproof breathable film) is a functional film made of polymer materials (such as polyethylene, polytetrafluoroethylene, etc.), and the surface is distributed with micropore structure with a diameter of about 0.0004 micron. Its working principle is based on microporous filtration and concentration gradient diffusion: Waterproof: the diameter of liquid water droplets (about 0.02 mm) is much larger than that of micropores, so it cannot penetrate; Permeability: The molecular diameter of water vapor (about 0.0000004 mm) is much smaller than that of micropores, and it can diffuse freely. Some high-end products (such as Dupont Tyvek) use flash evaporation process to form non-woven fabric structure through high-density polyethylene fibers, which has both the toughness of paper and the waterproof of film. application area building field Exterior wall and roof: as the second waterproof barrier, protect the insulation layer (such as metal roof and wood structure building); Energy-saving design: reduce air infiltration and energy consumption (reduce heat loss in cold areas and block hot air intrusion in hot areas). Industry and medical treatment Medical packaging: sterilized packaging (such as sterile masks and surgical instruments), which uses one-way air permeability to balance sterilization and pollution prevention; Chemical protection: resistant to acid and alkali corrosion, used in chemical plants and sewage treatment facilities. Outdoor and consumption Equipment manufacturing: backpacks, umbrellas, tents, both lightweight and durable; Clothing fabric: windproof and waterproof coat to enhance the comfort of outdoor activities.

Breathing paper (also known as waterproof breathable film, Dike waterproof breathable film) is a functional film made of polymer materials (such as polyethylene, polytetrafluoroethylene, etc.), and the surface is distributed with micropore structure with a diameter of about 0.0004 micron. Its working principle is based on microporous filtration and concentration gradient diffusion: Waterproof: the diameter of liquid water droplets (about 0.02 mm) is much larger than that of micropores, so it cannot penetrate; Permeability: The molecular diameter of water vapor (about 0.0000004 mm) is much smaller than that of micropores, and it can diffuse freely. Some high-end products (such as Dupont Tyvek) use flash evaporation process to form non-woven fabric structure through high-density polyethylene fibers, which has both the toughness of paper and the waterproof of film. application area building field Exterior wall and roof: as the second waterproof barrier, protect the insulation layer (such as metal roof and wood structure building); Energy-saving design: reduce air infiltration and energy consumption (reduce heat loss in cold areas and block hot air intrusion in hot areas). Industry and medical treatment Medical packaging: sterilized packaging (such as sterile masks and surgical instruments), which uses one-way air permeability to balance sterilization and pollution prevention; Chemical protection: resistant to acid and alkali corrosion, used in chemical plants and sewage treatment facilities. Outdoor and consumption Equipment manufacturing: backpacks, umbrellas, tents, both lightweight and durable; Clothing fabric: windproof and waterproof coat to enhance the comfort of outdoor activities.