alt Hacker News> 3M does not provide product information on which filters are best for government repression
That would be the 3M™ Organic Vapor/Acid Gas Cartridge/Filter 60923 [0]. Replace after each exposure or 30 days after opening the sealed packaging for best results. A clean shave is important for a good air seal.
The absolute best protection would be a PAPR (powered air-purifying respirator) with a TR-6530N filter [1] installed. Something like the 3M Versaflo M-407SG[2] would fit the filter and provide impact resistance. It can be fitted with a Speedglas 9100XXi [3] (or 9100X/V) auto-darkening filter for protection against flashbangs.
This is an equivalent PAPR [3] with a better form factor which also includes ANSI Z87.1 rated impact-protection (helpful against projectiles) and auto-darkening lenses (helpful against flashbangs/pyrotechnics). It also still works fine even if you keep a beard. I believe this is part of the Optrel Helix product line, which advertises 14-hour battery life. However, the listing I linked does not come with organic vapor / acid-gas filtration. That requires a different form factor for the filter, the Optrel ABE1P Combination Filter [4] offers A1B1E1P certification (Protects against organic gases/vapors, inorganic gases, acid gases, and particulates)
As 'closewith added, "CBRN" or "NBC" masks are also a good option - they are rated for chemical/biological/radiation/nuclear contamination and are available as riot gear with good impact-resistance. Look for A2B2E2K2-P3 ratings / certification.
You could also look into something like the Joseph Leslie Dynamiks A3B3E3K3-rated Jumbo canister for 10000 ppm extended exposure. [5]
0: https://www.3m.com/3M/en_US/p/dc/v000075263/
1: https://www.mcmaster.com/products/cartridges/manufacturer-mo...
2: https://multimedia.3m.com/mws/media/1892506O/3m-versaflo-m-4...
3: https://www.3m.com/3M/en_US/speedglas-welding-helmets-us/spe...
3: https://www.mcmaster.com/9258n17/
4: https://optrel.us/product/upgradekit-combifilter-swiss-air-5...
5: https://www.josephlesliedynamiks.com/brochures/Gas_Filters.p...
Replies
I wonder how that performs vs the CP3N.
My own experience is that fit is as/more important than filters, and who knows how well civvies will fit their CBRN gear. It's _oppressively_ uncomfortable!
I've used the same 3M 6011 (organic vapor) filter for years, for tasks like cleaning with ammonia where I'm not really worried about hazardous exposure just nuisance [0]. And it's lasted just fine (extremely off-label use, of course). So with something like tear gas where you're not worried about actual toxicity per se, I'd think that subjective experience would be fine for knowing when it needs to be changed. If you want to be paranoid, it seems like you could also carry a backup fresh set still in the sealed foil.
With the prices for respirators going up (/me gestures at federal "government" attacking our own cities), if I wanted to save money I'd get a knock-off full face respirator from Amazon (or Ali if you're comfortable transiting the import blockade with this specific item), and then genuine cartridges (NOT from Amazon obviously, lol).
[0] for most things I do, I use the 2097 filters which are primarily particulate with just a small amount of activated charcoal for "nuisance vapors". This is all generally with half-face 7500 bodies.