Conducting the test procedure of Viral Filtration Efficiency (VFE) of 4Mass S.A. medical masks.
On 2 October 2020, the test procedure for effectiveness of filtration of viral particles (VFE) of medical masks produced by 4MASS S.A. was completed.
The test procedure was carried out by the Department of Chemical, Dust and Biological Hazards at the Central Institute for Occupational Safety and Health of the PIB using the guidelines contained in Annex B (test for filtration efficiency of Staphylococcus aureus strains ATCC 6538) of the European standard EN 14683:2019+AC. In the VFE test, the generated biological aerosol contained viral particles of a bacteriophage strain Phi X174 (AtCC 13796-B1) with a sphere shape with specks of ~32 nm diameter.
Evaluation of the filtration efficiency of viral particles VFE was 98%