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Waterproof Polypropylene Meltblown Non Woven Fabric Filter Media for Mask. High Filtration Efficiency: BFE/PFE up to 99% with low resistance for superior particle capture. Advanced Electret Technology: Nanoscale fibers with optimized charge for low breathing resistance. Multi-Standard Compliance: Meets NIOSH, EN149, GB2626, and AS/NZS global protection standards. Skin Safety Certified: Passed ISO 1093 cytotoxicity tests; safe for direct skin contact. Free Sample Support: Free A4 samples and documentation support for third-party testing.