Description
The MSA 818343 is the Flexi-Filter/P100 w/Nuisance level OV, ozone removal, a Flexi-Filter pad for MSA Advantage bayonet (Flexi-Filter Pads for Advantage Respirators). The MSA chart marks it for P100. Color code Magenta. Sold by the pair. Ships in 1–2 business days; most orders arrive in 3–7 business days.
MSA 818343 specifications
| Item | Manufacturer data |
|---|---|
| MSA part number | 818343 |
| MSA chart description | Flexi-Filter/P100 w/Nuisance Level OV, Ozone Removal |
| Cartridge line | Flexi-Filter Pads for Advantage Respirators |
| Type | Flexi-Filter pad |
| NIOSH classes marked on the chart | P100 |
| Fits | MSA Advantage bayonet (Flexi-Filter Pads for Advantage Respirators) |
| Color coding | Magenta |
| End-of-service-life indicator | none stated |
Source: MSA Respirator Cartridge Chart 1000-86-MC (Feb 2017).
What the MSA chart marks for the 818343
| NIOSH class or note | Status |
|---|---|
| P100 | Marked on the MSA chart |
| Chart note 1 | Do not use in atmospheres containing less than 19.5 percent oxygen, in atmospheres containing gases or vapors or in atmospheres immediately dangerous to life and health. |
| Chart note 4 | 99.97 percent efficient against 0.3 micron DOP. |
Source: MSA Respirator Cartridge Chart 1000-86-MC (Feb 2017). P100-Particulate Filter (99.97% filter efficiency level) effective against all particulate aerosols. N95-Particulate Filter (95% filter efficiency level) effective against particulate aerosols free of oil; time use restrictions may apply. R95-Particulate Filter (95% filter efficiency level) effective against all particulate aerosols; time use restrictions may apply.
MSA chart notes for the 818343
Do not use in atmospheres containing less than 19.5 percent oxygen, in atmospheres containing gases or vapors or in atmospheres immediately dangerous to life and health.
99.97 percent efficient against 0.3 micron DOP.
Source: MSA Respirator Cartridge Chart 1000-86-MC (Feb 2017).
MSA facepieces that take the 818343
MSA Advantage bayonet (Flexi-Filter Pads for Advantage Respirators).
| Facepiece | Type | How the cartridge mounts |
|---|---|---|
| Advantage 420 Half-Mask Respirator | Half mask | Advantage bayonet; threaded Comfo cartridges with adapter 809999 |
| Advantage 200 LS Respirator | Half mask | Advantage bayonet |
| Advantage 3200 Twin-Port Respirator | Full facepiece | Advantage bayonet (twin-port) |
| Advantage 4200 Twin-Port Facepiece | Full facepiece | Advantage bayonet mounts in the lens (twin-port) |
| Advantage 1000 Full-Facepiece Respirator / Riot Control Gas Mask | Full facepiece | Advantage bayonet (twin cartridges or bayonet riot-control canister 817588) |
| G1 Facepiece with Twin-Port Cartridge Adapter | Full facepiece | Advantage cartridges with twin-cartridge APR adapter 10199720 |
Source: MSA Respirator Cartridge Chart 1000-86-MC (Feb 2017); MSA Advantage Twin Cartridge Respirators data sheet 1012-42-MC (08.2025); MSA Comfo Classic data sheet 1021-02-MC (07.2026); MSA G1 Facepiece Twin Cartridge APR Adapter data sheet 1000-89-MC.
NIOSH approval configurations naming the 818343
The MSA NIOSH approval inserts list 6 approval configurations naming this part:
| Approval | Protection (insert) | Approval insert | Other cartridges/filters in the row |
|---|---|---|---|
| TC-84A-2739 | P100 | Advantage 1000 Respirator Family | 818342, 818344 |
| TC-84A-2793 | P100 | ADVANTAGE 200 LS RESPIRATOR FAMILY | 818342, 818344 |
| TC-84A-3665 | P100 | ADVANTAGE 3000 SERIES RESPIRATOR - MODEL 3200 | 818342, 818344 |
| TC-84A-4459 | P100 | ADVANTAGE 4000 SERIES APR RESPIRATOR | 818342, 818344 |
| TC-84A-5031 | P100 | ADVANTAGE 420 RESPIRATOR FAMILY | 818342, 818344 |
| TC-84A-8512 | P100 | G1 APR | 815355, 818342, 818344 |
Source: MSA NIOSH approval inserts Advantage-1000, Advantage-200LS, Advantage-3200, Advantage-4000-Series, Advantage-420, G1-APR (material numbers 10021588, 10029528, 10084702, 10100439, 10160485, 818362). Each insert states the respirator is approved only in the listed configurations; the cautions and limitations letters are printed on the insert.
Every MSA Advantage cartridge, filter and prefilter we list
| Part number | MSA chart description | NIOSH classes | Color coding | MSA pack |
|---|---|---|---|---|
| 815355 | Organic Vapor (GMA) | Organic Vapor | Black | 2/PKG |
| 815362 | Organic Vapor/P100 (GMA) | Organic Vapor, P100 | Black/Magenta | 2/PKG |
| 815357 | Organic Vapor/Acid Gas (GMC) | Organic Vapor, Chlorine, Sulfur Dioxide, Chlorine Dioxide, Hydrogen Chloride, Hydrogen Sulfide | Yellow | 2/PKG |
| 815364 | Organic Vapor/Acid Gas/P100 (GMC) | Organic Vapor, Chlorine, Sulfur Dioxide, Chlorine Dioxide, Hydrogen Chloride, Hydrogen Sulfide, P100 | Yellow/Magenta | 2/PKG |
| 815359 | Multigas (GME) | Organic Vapor, Chlorine, Sulfur Dioxide, Chlorine Dioxide, Hydrogen Chloride, Hydrogen Sulfide, Ammonia, Methylamine, Formaldehyde, Hydrogen Fluoride | Olive | 2/PKG |
| 815366 | Multigas/P100 (GME) | Organic Vapor, Chlorine, Sulfur Dioxide, Chlorine Dioxide, Hydrogen Chloride, Hydrogen Sulfide, Ammonia, Methylamine, Formaldehyde, Hydrogen Fluoride, P100 | Olive/Magenta | 2/PKG |
| 815368 | Chlorine/Mercury Vapor/P100 (Mersorb) | Chlorine, Mercury Vapor, P100 | Olive and black diagonal stripe/Magenta | 2/PKG |
| 815369 | Low-Profile P100 | P100 | Magenta | Pack of 2 |
| 818342 | Flexi-Filter/P100 | P100 | Magenta | — |
| 818346 | Flexi-Filter/N95 | N95 | Black | — |
| 815394 | N95 Snap-On Prefilter | N95 | — | Pack of 10 |
| 815392 | Reusable Snap-On Cover (for N95 Snap-On Prefilter) | N95 | — | 2 in a Package |
Source: MSA Respirator Cartridge Chart 1000-86-MC (Feb 2017).
MSA shelf life and change-out statements
Shelf Life of Filter Cartridges: All particulate-only cartridges and filters have an unlimited shelf life. This includes Flexi-Filters, Comfo and Advantage style P100 cartridges. Also, Type HE PAPR cartridges that are particulate-only have unlimited shelf life. These include Optifilter and OptimairTL Type HE cartridges. Chemical and Combination cartridges for all APR have a recommended shelf life of 3 years. Please note that these cartridges do not have an "expiration date" printed on them. PAPR combination cartridges, gas mask canisters, including industrial gas masks, CBRN and Riot control canisters have an expiration date printed on the cartridge label. Generally these are 5 year expiration. While the P100 or particulate performance efficacy of these types of canisters may remain intact following expiration, MSA cannot advocate use beyond the expiration date.
Riot Control Canisters, CBRN Canisters, and Combination Chemical/Particulate Respirator Cartridges (GMA-P100, GMB-P100, GMC-P100, GMD-P100, GME-P100, GMF-P100 and GMI-P100) generally are limited use cartridges and have required changeout schedules.
Source: MSA Product Cleaning Guidance 1000-91-MC.
Catalog data
| Item | Manufacturer data |
|---|---|
| Filter Rating | P100 |
| Style | Filter Pad |
| Color | Magenta |
| Filter Class | P100 |
Source: Manufacturer published product data as carried in our catalog.
MSA Flexi-Filter® P100 pads for MSA Advantage respirators add relief from nuisance levels of organic vapors and ozone, in a low-profile, flexible pad that fits under a welding hood.
- Swept-back design for better vision and comfort
- Low-profile, flexible pads fit well under a welding hood and with other protective equipment
Sold by the pair
One pair holds 2 pads. The price shown is for the full pair; quantity 1 = 1 pair (2 pads).
MSA 818343 questions
What does the MSA 818343 protect against? The MSA chart marks P100.
Which MSA facepieces take the 818343? MSA Advantage bayonet (Flexi-Filter Pads for Advantage Respirators).
What is the 818343 color code? Magenta (MSA chart).
Guides: cartridge change schedules · P100 vs N95 vs R95 · half mask vs full facepiece · assigned protection factors · what OSHA requires for fit testing · cleaning and storing respirators · all respirators by model and hazard.
