And many companies now make N95 respirators. But for 3M, which has gone from producing billions to hundreds of millions of ...

FILE - In this March 5, 2020, file photo, Dr. Deborah Birx, Ambassador and White House coronavirus response coordinator, holds a 3M N95 mask as she and Vice President Mike Pence visit 3M headquarters ...

The masks are based on the shape of the 3M 1860 style of N95 masks, the type normally used at Brigham and Women's Hospital. The researchers tested several different sterilization methods on the ...