N95 vs KN95 vs 3-Ply Masks: Which One Do You Need?
“Mask” covers everything from a thin earloop mask to a reusable respirator with filters. They are not interchangeable. A 3-ply mask stops droplets and splashes, while an N95 respirator filters fine dust from the air you breathe. This guide explains the differences so you can pick the right protection.
At a glance
| Type | What it does | Fit | Typical use |
|---|---|---|---|
| 3-ply face mask | Barrier against droplets and splashes | Loose, ear loops | Food service, clinics, salons |
| KN95 | Filters airborne particles (Chinese standard) | Closer, fold-flat | Everyday and light dusty work |
| N95 respirator | NIOSH-approved: at least 95% of non-oil particles | Sealed, two straps | Sanding, grinding, sweeping |
| Half-mask + P100 | NIOSH P100: at least 99.97%, oil and non-oil particles | Sealed, reusable | Lead paint, mould, fibreglass |
3-ply face masks
A 3-ply mask has two outer layers and a melt-blown filter layer in the middle. It is light and easy to breathe through, and it keeps your droplets in and splashes out. Our 3-Ply Earloop Face Masks, Blue, BFE >95%, Liquid Resistant are rated BFE above 95% by the manufacturer, come 50 to a box, and suit food processing, restaurants, dental and medical offices, cleaning and salons. A 3-ply mask is not a respirator: it does not seal to the face.
KN95 masks
KN95 is a Chinese mask standard. A KN95 has several filter layers in a fold-flat shape that sits closer to the face than a surgical mask. Our Clean Shield KN95 Face Masks have five layers and are individually wrapped, which is handy for travel and for handing out at work.
N95 respirators
N95 is the US NIOSH standard. A NIOSH-approved N95 filters at least 95% of non-oil airborne particles and is designed to seal to the face. The 3M 8210 N95 Dust Mask is the classic choice for grinding, sanding, sweeping, sawing and bagging. If your health and safety program requires NIOSH-approved respirators, choose an N95, not a KN95.
N95 means “not oil resistant”. It is not suitable for oil mists, and no particulate respirator protects against gases or vapours.
Reusable half-mask respirators
For regular dusty or hazardous work, a reusable respirator with replaceable filters often costs less over time. The 3M™ Half Facepiece Reusable Respirator accepts 3M cartridges and filters. With 3M™ Particulate Filter. P100, it filters at least 99.97% of particles, including oil-based ones, which suits lead paint, mould and fibreglass. For paint or solvent fumes you need organic vapour cartridges instead, because particulate filters do not stop vapours.
Getting a good seal
A respirator only works if it seals. Put the top strap high on the back of your head and the bottom strap below your ears, then mould the nose clip with both hands. Breathe out sharply: if air leaks at the edges, adjust it. Facial hair under the seal prevents a proper fit. Many workplaces require fit testing for respirators, so check your program.
Frequently asked questions
Is a KN95 the same as an N95?
No. They are different standards. KN95 is Chinese and N95 is NIOSH (US). Workplaces that require NIOSH approval need an N95.
Can I use a 3-ply mask for sanding?
No. For dust from sanding or grinding, use an N95 respirator or a half-mask with particulate filters.
Do P100 filters stop paint fumes?
No. They stop particles only. Fumes and vapours need organic vapour cartridges.