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High Precision Eptfe Hydrophobic Waterproof Gas Permeable Film. High Filtration Efficiency: Achieves 99.9999% efficiency with a filtration precision of 0.01 um. Superior Hydrophobicity: Made of hydrophobic ePTFE ensuring excellent water resistance. Customizable Width: Available in standard 260mm/520mm or customized up to 1600mm. High Porosity & Low Resistance: Features high porosity with low air resistance for high throughput. Excellent Chemical Stability: Resistant to strong acids, alkalis, and almost all solvents. Customizable Pore Size: Aperture options range from 0.1um to 50um based on requirements. Advanced Manufacturing: Produced via high-temperature bonding of ePTFE and PP non-woven fabric.