Testing whether uncertified N95 masks are effective | MIT ...
May 13, 2020·In addition to testing filtration efficiency, the laboratory is also testing N95 and KN95 masks’ resistance to blood penetration. While not all N95 masks are designed or certified as a surgical mask, surgical-grade N95s, and their KN95 counterparts, must protect people both from the inhalation of aerosols and from splashes or sprays of body ...