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Author: FTM Date: Jun 12, 2024

PTFE Film: The Secret of Porosity and Breathability

In the field of materials science, PTFE (polytetrafluoroethylene) film stands out for its unique properties, especially in the field of waterproof and breathable. Its unique microporous structure provides a large number of channels for water vapor molecules, allowing the film to achieve efficient breathability while maintaining waterproofing.


PTFE films have a porosity of more than 85 percent, an impressive figure. This means that there are up to 1.4 billion tiny pores on each square centimeter of film. These pores are not only a manifestation of quantity, but also a combination of size and distribution. Their size is much smaller than the diameter of the droplet, so the droplet cannot penetrate the membrane directly, ensuring the waterproofing of the membrane.


However, these tiny pores provide adequate channels for water vapor molecules. The diameter of water vapor molecules is much smaller than the size of micropores, so they can easily pass through the film to achieve breathable function. This unique property makes PTFE film widely used in outdoor clothing, medical dressings, architectural membranes and other fields.


It is worth noting that the high porosity not only provides a channel for water vapor molecules but also reduces their diffusion resistance in the film. Under the same conditions, water vapor molecules diffuse faster in the PTFE film and the moisture permeability is significantly improved. This allows the PTFE film to effectively prevent the adverse effects of a humid environment on the human body while maintaining comfort.


The waterproof and breathable properties of PTFE films depend not only on their porosity and micropore size, but also on other factors, such as film thickness, surface treatment process, etc. However, these tiny pores provide essential channels for water vapor molecules, giving PTFE films an irreplaceable advantage in the waterproof and breathable domain.


With the advancement of science and technology and people's pursuit of comfort, the waterproof and breathable function of PTFE film will be more widely used. From outdoor adventures to medical care, from architectural membranes to electronic device packaging, PTFE film will contribute to the development of various fields with its unique performance.


The porosity and microporous structure of PTFE film are the key to its waterproof and breathable function. This unique structure provides the necessary channels for water vapor molecules, allowing PTFE film to achieve efficient breathable function while maintaining waterproofing. With the continuous development of science and technology, the performance of PTFE film will be further improved and optimized, bringing more convenience and comfort to people's lives.