Fig 1.
Schematic diagrams depicting the tests used to measure filter efficiency (top left), splash resistance (top right), and breathability of the materials examined in this study.
Fig 2.
Summary of the filter efficiency of the indicated materials, including five rounds of sterilization at 121 degrees Celsius for the triple-layer material.
For comparison, we also included a surgical mask and two types of FFP2 mask.
Table 1.
Summary of the filter efficiency of the Quickcheck H300 material and commercially available masks, for the indicated particle sizes.
Fig 3.
The differential pressure over the different layers of materials, including after different rounds of sterilization.
As a comparison the differential pressure is compared to commercially available surgical masks and disposable FFP2 respirators.
Fig 4.
Summary of the results of the water column test.
Fig 5.
A possible design for fabricating a respirator mask with the sterile isolation material.
(A) The layers of the Halyard sterile isolation material are attached by a stitch line on both longitudinal lengths of the sheets. The sheet is folded to provide alignment with the face, and thereby ensure the respirator mask has an adequate fit when worn. The elastics (Resistance Band, Matchu Sport BV) is laser-cut to a width of 13/32 inch (10mm), and a length of 7 7/8 inch (200mm) and attached at the inside of the respirator mask. A single stitch line at the bottom ensures that the surface of the respirator mask stays separated from the mouth and allows to adjust the size of the respirator mask for -and by- anybody. (B) For the nose clip a 0.5mm thick aluminum strips (Al 99.5%, 1050A) is used, cut to a length of 3 1/2 inch (90mm) and a width of 5/32 inch (4mm). A neoprene strip with adhesive is used to hold the noseclip in place, and adhered to the inner-top side of the respirator mask. The fit of the mask was tested using an FT-30 Fit Test from 3M.