NIOSH particulate filter approval Categories
|Minimum filter effisciency||N Series|
Not resistant to oil
|R Series |
Somewhat resistant to oil
Strongly resistant to oil
Important Quality Parameters of masks Explained
Bacterial filtration efficiency 3STM F2101
|• Evaluation of filtration efficiencies related to both patient generated aerosols and wearer generated aerosols.|
• Higher BFE, better the protection level.
BFE > 95% indicates the Type-I surgical face masks
BFE > 98% indicates the Type-II surgical face masks.
|Breathing resistance (∆P) BSEN 13274- 3 - 2001 & EN 143|
|Used to determine the resistance of airflow through the facemask.|
• Lower the breathing resistance values per cm2 higher the comfort
Splash resistance (ASTM F1862-07):
|· Higher splash resistance, better protection|
|Flammability (16 CFR 1610):|
| The materials used in operation theatre will burn if high intensity heat energy is applied to them, especially in the presence of elevated oxygen levels.|
· Hence, the flammability test for surgical face masks is essential.
The flame spread characteristics are classified in terms of class 1 to class 4 for the above tests.
· For NFPA, class 1- slow burning