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Old 05-28-2020, 10:19 AM
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Lucy Lucy is offline
Join Date: Sep 2001
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Again thanks to Incredible Hulctuary, a study regarding Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks

In conclusion, we have measured the filtration efficiencies of various commonly available fabrics for use as cloth masks in filtering particles in the significant (for aerosol-based virus transmission) size range of ∼10 nm to ∼6 μm and have presented filtration efficiency data as a function of aerosol particle size. We find that cotton, natural silk, and chiffon can provide good protection, typically above 50% in the entire 10 nm to 6.0 μm range, provided they have a tight weave. Higher threads per inch cotton with tighter weaves resulted in better filtration efficiencies. For instance, a 600 TPI cotton sheet can provide average filtration efficiencies of 79 23% (in the 10 nm to 300 nm range) and 98.4 0.2% (in the 300 nm to 6 μm range). A cotton quilt with batting provides 96 2% (10 nm to 300 nm) and 96.1 0.3% (300 nm to 6 μm). Likely the highly tangled fibrous nature of the batting aids in the superior performance at small particle sizes. Materials such as silk and chiffon are particularly effective (considering their sheerness) at excluding particles in the nanoscale regime (<∼100 nm), likely due to electrostatic effects that result in charge transfer with nanoscale aerosol particles.
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