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RESULTS FOR PROPOSED MASK "FIXES"
LAST UPDATEDMay 17, 2020
NORTHEASTERN UNIVERSITY - FERNANDEZ AND MUELLER
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Table 3. Proposed methods for improving mask fit: filtration efficiency and uncertainty. NOTE: All "fixes" tested on the poorest fitted commercial surgical mask (S-3).
Return to website here:Mask Testing at Northeastern University
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LabelPhotoShapeNumber of SamplesMean Filtration Efficiency - Surgical Mask Alone (%)Did "fix" improve results?Improvement in Mean Filtration Efficiency with "fix" (% points)Absolute Mean Filtration Efficiency with "fix" (%)Variability between tests, using "fix" (% points)Variability in filtration efficiency, with "fix" (% points)Materials & description
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Note 1Note 2Note 5Note 3Note 4
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FIX-1DIY Surgical Mask Brace, thick353.4YES40.193.52.62.5standard rubber bands (information and photo to right courtesy of fixthemask.com)
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FIX-2
DIY Surgical Mask Brace, thin353.4YES43.296.62.31.0standard rubber bands (information and photo to right courtesy of fixthemask.com)
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FIX-3Mask Brace V2.0, 1/16th thick353.4YES38.191.52.34.1rubber sheeting (information and photo to right courtesy of fixthemask.com)
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FIX-4Mask Brace V2.0, 1/32nd thick353.4YES25.178.52.47.6rubber sheeting (information and photo to right courtesy of fixthemask.com)
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FIX-5Brace for ear loops to improve comfort353.4YES20.774.15.18.6https://www.thingiverse.com/thing:4249113
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FIX-6Nylon stockings (cylindrical section)353.4YES40.093.42.33.1Hanes Silk Reflections, Silky Sheer, size EF
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FIX-7Nylon stockings (cylindrical section)353.4YES38.091.43.04.6Hanes Silk Reflections, Silky Sheer, size GH
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FIX-8Nylon stockings (cylindrical section)353.4YES30.083.42.38.4Hanes Silk Reflection, Silky Sheer, size IJ
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FIX-9Nylon stockings (cylindrical section)353.4YES40.894.22.32.5L'eggs Silken Mist, size Q
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FIX-10Nylon stockings (cylindrical section)353.4YES43.096.42.31.3L'eggs Silken Mist, Ultra Sheer with run resist, size Q
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FIX-11Nylon stockings (cylindrical section)353.4YES41.895.22.52.0Hanes Stylessentials Sheer Tight, L/XL
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FIX-12Nylon stockings (cylindrical section)353.4YES24.077.43.019.6
Hanes Stylessentials Silky Opaque Tight, L/XL
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FIX-13Bamboo tights (cylindrical section)353.4YES43.797.12.31.1Knit tights, 70% rayon made from bamboo, 27% polyester, 3% spandex, no brand name available, size M
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EXPLANATORY NOTES:
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1Tests run by using the proposed method for improving mask fix on top of Mask S-3.
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2If "YES" - this means the overall fit of the mask when worn as designed had significant air-leakage pathways. If "LIKELY" it means we did not have enough masks to verify repeatability of the improvement seen.
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3Reported as the standard deviation between replicate masks - provides a measure of consistency of construction of the mask and fix together.
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4Provides a combined measure of goodness of fit and material filtration efficiency. Calculated as the mean of time-based standard deviation for each mask test.
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5Provides a measure of how well this approach improves the fit of the underlying mask.
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