Technically referred to as Respiratory Protective Devices (RPD) The most common masks can be classified as follows:
- N-95 masks
- Surgical masks
- Homemade masks
CDC does not recommend public use of this masks.
It achieves a very tight fit.
Is very effective in filtration of airborne particles.
Has 95% filtration capacity for particles 0.3 micrometres or bigger.
However, doesn’t 100% eliminate risk of Infection.
Cannot be shared and has limited reuse.
Is a loose fitting disposable mask
Offers protection by creating a physical barrier with immediate environment
Protect against large-particle droplets, splashes, sprays, or splatter
Usually has 2-3 layers ie. 2 ply or 3 ply
Has a low filtration capacity and poor protection against particles < 2 micrometres
One cannot share or reuse.
BASIC HOMEMADE MASK
Offers physical barrier for both inward and outward protection
Has a low filtration capacity
Has a low protective factor compared to other masks
Capacity of re-use
MODIFIED HOMEMADE MASKS
Protection of homemade masks can be increased by adding layers to the mask, proper fitting and adding a filter. We propose the use of a sanitary pad as a mask filter.
Filtration Capacity of a Sanitary Pad
Pads consist of 3 main layers
- Top- non-woven fabric
- Middle adsorbent material
- Outer impermeable back sheet with adhesive (Should be removed when using as a mask filter)
The super-fine inner fibers provide filtration capability for micro/nano-size particles
Masks offer protection in two ways:
Self-protection against transmission by reducing external exposure to particles
Retention of particles inside of masks to reduce spread of infection to others.
- N-95 Respirators – 99
- Surgical Masks – 5.3
- Homemade masks – 3.2