N95 masks at various temperatures and humidity levels to determine whether the virus could be detected on the treated masks.They assessed masks subjected to multiple cycles of thermal disinfection for structural integrity using powerful microscopes, and for protective functions using standards of the US National Institute for Occupational Safety, and Health for particle filtration efficiency, breathing resistance and respirator fit.They also analysed fibre samples for structural integrity and assessed function of the masks after treatment with heat."After 10 disinfection cycles, masks maintained fibre diameters similar to untreated masks and continued to meet standards for fit, filtration efficiency, and breathing resistance," the study.