The composite structure also is very suitable for use as thermal insulation in apparel.doi:US5804295 ADavid L. BraunJames E. SteffenUSUS5656368 May 23, 1995 Aug 12, 1997 Minnesota Mining And Manufacturing Company Fibrous filtration face mask having corrugated polymeric microfiber filter layer...
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A composite structure of this construction made by this method provides very good filtration performance, making it particularly suitable for use as a filter in a cup-shaped face mask. The composite structure also is very suitable for use as thermal insulation in apparel.Braun, David L....
A composite structure of this construction made by this method provides very good filtration performance, making it particularly suitable for use as a filter in a cup-shaped face mask. The composite structure also is very suitable for use as thermal insulation in apparel. STEFFEN JAMES EDAVID ...