What is the impact of porosity measurement on the performance of ePTFE membrane?

1. Air permeability:
The porosity of the ePTFE membrane directly affects its air permeability. The higher the porosity, the better the air permeability, which makes the ePTFE membrane important in applications such as air filtration, waterproof and breathable.
2. Filtration accuracy:
The pore size and porosity jointly determine the filtration accuracy of the ePTFE membrane. The measurement of porosity can help determine the microporous structure of the membrane and thus evaluate its filtration effect.
3. Barrier performance:
The porosity of the ePTFE membrane also affects its barrier performance. In applications such as liquid filtration, dust and waterproofing, the appropriate porosity can effectively block particles and liquids while allowing gas to pass through.
4. Mechanical strength:
The porosity of the ePTFE membrane has a significant impact on its mechanical strength. Changes in porosity affect the orientation of the fibers and the connection of the nodes, thereby affecting the tensile strength of the membrane.
5. Chemical stability and heat resistance:
The measurement of porosity helps to understand the chemical stability and heat resistance of the ePTFE membrane. While maintaining the excellent chemical stability and heat resistance of PTFE, the pore structure of the ePTFE membrane provides additional functional properties.
6. Surface properties:
The pore size distribution, average pore size and maximum pore size of the ePTFE membrane, together with the surface properties of PTFE, are the most important properties of the membrane in application. The measurement of porosity is very important for quantifying the parameters that define the membrane.
7. Control of microporous structure:
The measurement of porosity can help control the microporous structure of the ePTFE membrane, which is critical to achieving the desired performance in a specific application. For example, in oil-water separation applications, high separation efficiency and flux can be obtained by controlling porosity and pore size.
8. Effect of heat treatment:
Heat treatment can affect the porosity of the ePTFE membrane, thereby affecting its performance. Studies have shown that the maximum pore size, average pore size and porosity of the heat-treated ePTFE membrane are reduced, and the retention rate of nanoparticles suspended in organic solvents is close to 100%.