KN95 Respirator Testing (IMAGE) Southwest Research Institute Caption The SwRI Particle Science and Technology Laboratory team is testing N95 and KN95 respirators and surgical masks for quality assurance. Engineers cut out a sample of mask material to evaluate particle filtration and flow resistance. The team previously focused solely on engine emission particle testing. They began testing mask materials for health care, government and industry clients in response to the COVID-19 pandemic. Credit Larry Walther, SwRI Usage Restrictions Images/videos may be used by the media and the public for educational and informational purposes only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.