Material: Halyard H600 two-ply spun polypropylene. Provides an outstanding barrier against both aqueous and airborne contamination.
With M-95 respiratory masks in short supply, UF Health workers devise way to reuse hospital materials, otherwise discarded.
The innovative mask uses Halyard H600 two-ply spun polypropylene that cannot be penetrated by water, bacteria or particles. It blocks 99.9% of particulates, making the masks about 4% more effective at blocking particulate material than the N95 masks, according to Bruce Spiess, M.D., a professor of anesthesiology in the UF College of Medicine, who made that calculation based on the manufacturer’s specifications.
The Halyard material, which comes in 4-by-4-foot sheets, is typically discarded after surgical instrument trays are unwrapped and before coming into contact with patients. About 10 masks can be made from one sheet
“This material is otherwise thrown out, so by taking it, cutting it and making masks out of it, we’ve repurposed it,”
Local seamstress Georgetta Graham has stepped up to help with production and is already sewing prototypes in her home. Soon, kits containing pre-cut pieces of the Halyard material, ribbon or elastic to wrap around the head and a nose wire will be distributed for people to start sewing them in their homes.
The masks would be returned to UF Health the next day and individually sterilized by ultraviolet light or autoclave before being distributed to health care providers. As people use the masks, they should be either fit tested or pressed as tightly to the face as possible.
Source: https://www.gainesville.com/news/20200326/more-coronavirus-diy-uf-upcycles-for-masks
PDF document with specs
see Appendix 3: Physical properties ( on page 12 ) PDF download: https://www.halyardhealth.co.uk/media/17530073/hc465-03-uk_compliance_2015.pdf from: https://www.halyardhealth.co.uk/
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