A New Option for Medical Mask Filter Layers: UNM ePTFE Filter Media

The core of medical and protective masks lies in the filter layer. It must intercept droplets, particulates, and microorganisms while ensuring low breathing resistance and a comfortable fit. Traditional melt-blown fabric relies on electrostatic adsorption; however, as time passes and humidity fluctuates, the static charge diminishes, potentially reducing filtration efficiency.

UNM ePTFE microporous filter media offers a new option for high-end mask filtration. The ePTFE membrane forms a microporous structure through biaxial stretching, achieving high filtration efficiency through physical interception rather than electrostatic forces, resulting in more stable performance. For particles ranging from 0.1 to 0.2 micrometers, the interception efficiency can reach over 99.9995%, effectively blocking droplets, dust, pollen, and other particulate matter.

When used as the filter layer in medical and protective masks, UNM ePTFE filter media offers the following features:

First, low resistance. With a porosity of over 85%, the ePTFE membrane provides excellent air permeability. This reduces breathing resistance and enhances wearing comfort while maintaining filtration efficiency.

Second, hydrophobic and splash-resistant. PTFE has low surface energy and is inherently hydrophobic and oleophobic, which reduces wetting by droplets and bodily fluids, keeping the filter layer dry and stable.

Third, it is chemically stable. It is resistant to acids, alkalis, and organic solvents, resists aging, and is suitable for use in composites with nonwoven fabrics and melt-blown fabrics.

Fourth, it is composite-ready and customizable. UNM can provide ePTFE membrane materials in various grammages, widths, and air permeability levels based on mask structural requirements; when thermally laminated with nonwoven fabrics, it does not delaminate and is easy to cut and weld.

UNM ePTFE filter media can be used as the filtering material in high-end protective masks and reusable masks, helping to enhance filtration performance and the wearing experience. For mask manufacturers, UNM offers customized support ranging from membrane materials to lamination, making it an important option for developing differentiated mask products.