Your browser doesn't support javascript.
Fitted filtration efficiency and breathability of 2-ply cotton masks: Identification of cotton consumer categories acceptable for home-made cloth mask construction.
Drouillard, Ken G; Tomkins, Amanda; Lackie, Sharon; Laengert, Scott; Baker, Allison; Clase, Catherine M; De Lannoy, Charles F; Cavallo-Medved, Dora; Porter, Lisa A; Rudman, Rebecca S.
  • Drouillard KG; Great Lakes Institute for Environmental Research, University of Windsor, Windsor, ON, Canada.
  • Tomkins A; School of Biomedical Engineering, McMaster University, Hamilton, ON, Canada.
  • Lackie S; Great Lakes Institute for Environmental Research, University of Windsor, Windsor, ON, Canada.
  • Laengert S; Department of Chemical Engineering, McMaster University, Hamilton, ON, Canada.
  • Baker A; Department of Biomedical Sciences, University of Windsor, Windsor, ON, Canada.
  • Clase CM; Department of Medicine, McMaster University, Hamilton, ON, Canada.
  • De Lannoy CF; Department of Chemical Engineering, McMaster University, Hamilton, ON, Canada.
  • Cavallo-Medved D; Department of Biomedical Sciences, University of Windsor, Windsor, ON, Canada.
  • Porter LA; Department of Biomedical Sciences, University of Windsor, Windsor, ON, Canada.
  • Rudman RS; Windsor Essex Sewing Force, Community Volunteer Group, Windsor, ON, Canada.
PLoS One ; 17(3): e0264090, 2022.
Article in English | MEDLINE | ID: covidwho-1753188
ABSTRACT
The objective of this study was to characterize commercially-available cotton fabrics to determine their suitability as materials for construction of cloth masks for personal and public use to reduce infectious disease spread. The study focused on cottons because of their widespread availability, moderate performance and they are recommended for inclusion in home-made masks by international health authorities. Fifty-two cottons were analyzed by electron microscopy to determine fabric characteristics and fabric weights. Sixteen fabrics were selected to test for breathability and to construct 2-ply cotton masks of a standard design to use in quantitative fit testing on a human participant. Cotton mask fitted filtration efficiencies (FFEs) for 0.02-1 µm ambient and aerosolized sodium chloride particles ranged from 40 to 66% compared with the mean medical mask FFE of 55±2%. Pressure differentials across 2-ply materials ranged from 0.57 to > 12 mm H2O/cm2 on samples of equal surface area with 6 of 16 materials exceeding the recommended medical mask limit. Models were calibrated to predict 2-ply cotton mask FFEs and differential pressures for each fabric based on pore characteristics and fabric weight. Models indicated cotton fabrics from 6 of 9 consumer categories can produce cloth masks with adequate breathability and FFEs equivalent to a medical mask T-shirt, fashion fabric, mass-market quilting cotton, home décor fabric, bed sheets and high-quality quilting cotton. Masks from one cloth mask and the medical mask were re-tested with a mask fitter to distinguish filtration from leakage. The fabric and medical masks had 3.7% and 41.8% leakage, respectively. These results indicate a well fitted 2-ply cotton mask with overhead ties can perform similarly to a disposable 3-ply medical mask on ear loops due primarily to the superior fit of the cloth mask which compensates for its lower material filtration efficiency.
Subject(s)

Full text: Available Collection: International databases Database: MEDLINE Main subject: COVID-19 Type of study: Diagnostic study / Prognostic study Limits: Humans Language: English Journal: PLoS One Journal subject: Science / Medicine Year: 2022 Document Type: Article Affiliation country: Journal.pone.0264090

Similar

MEDLINE

...
LILACS

LIS


Full text: Available Collection: International databases Database: MEDLINE Main subject: COVID-19 Type of study: Diagnostic study / Prognostic study Limits: Humans Language: English Journal: PLoS One Journal subject: Science / Medicine Year: 2022 Document Type: Article Affiliation country: Journal.pone.0264090