[Evaluation of submicron particle filtration efficiency of domestic and imported surgical masks]

ABSTRACT

Bioaerosols are one of the most important agents that cause post operating infections in hospitals. Surgical masks are recommended for prevention of bioaerosols transmition in operating rooms. This study aimed at evaluation of submicron particle filtration efficiency of domestic and imported surgical masks. In this cross sectional study, 5 types of surgical masks that have the most utilization in operating rooms of country's hospitals including domestic and imported surgical masks were tested. To evaluate all samples, the submicron particle filtration measurements were carried out based on ISIRI 6138 and American DOP standards. Filtration efficiency calculations and pressure drop measurements were performed and the results were analyzed using statistical tests. Results showed that particle filtration efficiency of domestic and imported masks were 56.130% [ +/- 10.7] and 31.906% [ +/- 7.062] respectively. Also, filtration efficiency in domestic masks were more than imported masks [P< 0.001]. Among all samples, Arman mask had the most filtration efficiency [66.5475% +/- 6.14951], where the least [27.8275% +/- 4.44152] filtration efficiency [P< 0.001] belongs to Blosom. The maximum mean of pressure drop in Arman mask [35 +/- 2. 58 Pa] and the least mean of pressure drop in Zist filter mask [11 +/- 1.82 Pa] were observed. According to the effect of filtration efficiency and pressure drop on general quality of mask, the quality factor of masks were also evaluated. Results showed that Zist filter mask had the most quality factor [0.068] while Blosom had the least quality factor [0.016]. This research showed that domestic surgical masks have a better quality toward imported surgical masks but can not obtained quality confirmed by standards, yet. To reduce respective infections and prevalence of diseases, it is recommended using filters with suitable physical characteristics and also carrying out test of surgical masks before supplying