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Sep 11, 2020 · Connecticut's high school volleyball players are learning to adapt to wearing masks while playing and some are even practicing outdoors in the preseason to reduce the risk of coronavirus spread. Melt Blown Face Mask Filter Material (BFE 95%) 40" (5Yds Melt Blown Face Mask Filter Material is a type of HEPA (high efficiency particulate air) filter. This 100% virgin polypropylene filtration material can be used for PPE (personal protective equipment) masks NCL develops face masks capable of filtering out 99% We prepared prototype face masks using spun-bound polypropylene medical grade cloth to evaluate bacterial filtration efficiency (BFE), particulate filter efficiency (PFE), breathability

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