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160um Thick Pet Backing Eptfe Hydrophobic Gas Permeable Film. High Hydrophobicity: Superior water repellent properties for gas filtration applications. High Filtration Efficiency: Achieves 99.9999% efficiency with 0.01 um precision. Customizable Width: Available in 260mm, 520mm, or customized up to 1600mm. Superb Chemical Stability: Resistant to strong acids, alkalis, and almost all solvents. High Porosity and Low Resistance: Ensures high throughput with minimal air resistance. Radiation Resistance: Maintains performance after long-term atmospheric exposure. High Tensile Strength: Durable structure with excellent mechanical properties.