What You Are Getting in a 4 Ply KN95 Mask
Four layers is the whole construction, and it is worth understanding what each is for. The outer and inner layers are non-woven and handle abrasion and comfort against skin. The filtering work happens in the middle, where a charged melt-blown layer catches particles that are far smaller than its own fibre gaps. That electrostatic effect is why the rating is given at 0.3 micron rather than at the size of a visible hole. Filtration efficiency is above 95% at that particle size. Fit is the other half of any mask's real-world performance. The nose piece is a malleable strip pressed down over the bridge of the nose. The body is held by elastic ear loops rather than head straps. Ear loops go on and come off faster, and they seal less firmly than two head straps. That is the trade for the convenience. The folding shape means it packs flat in a pocket or a drawer. Each mask is single use. It cannot be washed, cannot be reused once it is soiled or damp, and the filtration layer loses its charge with handling.
What a Disposable Particulate Respirator Like This Is Not
What a KN95 mask does tends to get overstated, so the standards are worth reading plainly. KN95 is a Chinese designation. It is not an N95, which is a United States rating, and not an FFP2 under the European standard. All three sit at similar filtration levels, but each is tested under its own scheme. A KN95 carries none of the other two by default. The United States regulator withdrew its emergency authorisations for non-domestically-approved disposable respirators in 2021. There is no current federal authorisation to point at for a mask of this type. A product name is not a certificate. The warnings set the limits. It is not a replacement for a gas mask or for a medical mask. It is not suitable for a toxic environment. It should not be worn where breathing is impeded or during sleep. Treat it as a dust, pollen and general particulate mask for everyday work, which is what it is.
Key Features
- Four layer construction: Non-woven outer and inner, with the filtering layer in the middle.
- Above 95% at 0.3 micron: The filtration efficiency of the material.
- Moulded nose piece: A malleable strip that is pressed down over the bridge of the nose.
- Elastic ear loops: Quicker on and off than head straps, and a looser seal for it.
- Folds flat: So it packs into a pocket or a drawer without being crushed.
- Single use only: It cannot be washed or reused once soiled or damp.
- Not a medical device: Not a replacement for a gas mask or a medical mask.
- Five or ten per pack: The ten pack is priced at exactly double, so cost per mask is flat.
Technical Specifications
| Specification | Value |
|---|---|
| SKU, five pack | KN95M-5 |
| SKU, ten pack | KN95M-10 |
| Product | Disposable folding particulate face mask |
| Layers | 4 ply |
| Filtration efficiency | Above 95% against particles of 0.3 micron |
| Retention | Elastic ear loops |
| Nose piece | Malleable moulded strip |
| Shape | Folding, flat pack |
| Reuse | None; single use, cannot be washed |
| Pack counts | 5 and 10 |
| Price per mask | The same in both counts; the ten pack is exactly twice the five pack |
| What KN95 is | A Chinese designation, distinct from the US N95 and the European FFP2 |
| US authorisation | Emergency authorisations for non-domestic disposable respirators were withdrawn in 2021 |
| Not suitable for | Toxic environments, medical use, gas mask duty, or wear during sleep |