The Filter Performance test was performed on the Cambridge Masks produced in 2020 to determine how well the samples could filter particles and how easy they are to breathe through. To test the PFE, the procedure uses a standard airflow of 85 L/min and NaCl aerosol, and the results indicated that the expired masks consistently performed at an exceptionally high level.
After the full loading process, the masks still blocked an average of 99.2% of 0.3 μm particles, with the lowest recorded efficiency being 99.05%. These results show that the expired Cambridge Masks’ performance falls far above the N95 requirement of 95%, placing them in the N99/KN99-level performance range. Moreover, even after being fully loaded with particles, penetration remained very low at 0.80%, proving that the filter material stayed effective.
In conclusion, the test results below show that the sample masks still demonstrate excellent filtration efficiency and exhibit the performance characteristics of premium, high-efficiency respirators.
If you have further question, please contact us by email at info@cambridgemask.com or Chat button on our sites to connect with our Customer Service Team.