[info] How to identify the different masks?

QUESTION 2: HOW TO IDENTIFY THE DIFFERENT MASKS?

Protective masks can differ in terms of their Bacterial Filter Efficiency (BFE) and Particle Filter Efficiency (PFE) properties. BFE measures the filtration efficiency of masks using mean particle size (MPS) in bacterial challenge at around 3.0 microns; PFE, on the other hand, measures the filtration efficiency of a mask using non-living, nonviable particles fixed in size from 0.1 microns. Masks with PFE properties will provide users with better levels of protection as the coronavirus itself measures between 0.05 and 0.2 microns in diameter. The two most widely available types of masks are:

• Cloth and paper masks: These are also commonly referred to as one- or two-ply masks and are effective in preventing large particles expelled by the user from reaching the environment. It has also been found and tested to be non-fluid resistant . This affects its protective qualities, making it less effective in protecting wearers against the virus. For this reason, its use should be restricted to low-risk situations.

• N95 respirator: This mask does reduce the user’s exposure to very small airborne particles or contaminants but may not protect against sprays and direct liquid splashes. The N95 respirator mask is different from the N95 surgical option which are used mostly in the medical field. 

Unlike the abovementioned varieties, surgical masks and medical-grade N95 masks offer the same bacterial filtration efficiency (BFE) of no less than 95%. Users should note that wearing a disposable medical mask provides enough protection if they are in a public place without contact with patients.

Ref: https://www.tuvsud.com/en-sg/resource-centre/stories/unmasking-the-facts