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Old 02-24-2011, 09:01 PM
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So, I've been looking into gas masks lately, mostly for use in the event of tear gas/cs being used. In doing this, I've come up with a few questions I can't seem to find an answer to. So, here I am.

How long do gas mask filters typically last, in terms of constant use? I know it varies depending on what they have been exposed to, but I was wondering if there is an approximate lifespan.

Also, how do you know when its time to change a filter? Does it get harder to breath through them? I honestly don't know.

Thanks in advance.
Old 02-24-2011, 09:14 PM
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For use specifically against CS/tear gas type exposure almost any filtering respirator will do. CS is not truly a gas but is a micro pulverized particulate which can float in the air like dust. So any good particulate filtering mask will satisfactorily defend against CS. Just be sure it fits well and seals against the face without gaps, then you will need to protect the eyes with snug goggles or use a full face mask. Filters for ordinary paint respirators would work and could be replaced cheaply and as often as you felt necessary to provide good flow, but should last quite long and still work.
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Old 02-24-2011, 10:05 PM
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Quote:
Originally Posted by DaarkMatter View Post
For use specifically against CS/tear gas type exposure almost any filtering respirator will do. CS is not truly a gas but is a micro pulverized particulate which can float in the air like dust. So any good particulate filtering mask will satisfactorily defend against CS. Just be sure it fits well and seals against the face without gaps, then you will need to protect the eyes with snug goggles or use a full face mask. Filters for ordinary paint respirators would work and could be replaced cheaply and as often as you felt necessary to provide good flow, but should last quite long and still work.
Well thats good news. Thanks!

So how do you know when its time to change a filter, though?
Old 02-24-2011, 10:14 PM
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Even old filters will do for tear gas. In boot camp we used training cannisters (i.e. expired cannisters). They just went in a bin at the end of the training for reuse, and I am just guessing they probably didn't keep track of how many times they were used. For NBC purposes though there is a shelf life based on how long the cannister has been exposed to the air. I believe without exposure to agents it's good for 24 hours. The time decreases based on the severity of the threat. I am pretty sure I can get this info for you if you shoot me an email to remind me. I am of course assuming you're talking about NATO standard gas masks/filters. That soviet block **** is useless.

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Old 02-24-2011, 10:16 PM
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I have conducted hundreds of CS/ Gas chamber house exercises training troops. Sometimes spent hours in the chamber at a time. Used the same mask for years, never needed to change filters. If it start to feel plugged or draws harder swap it out. Easy to do with a commercial type mask just buy extra and keep them sealed until needed
Old 02-24-2011, 10:38 PM
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Awesome, thanks guys!
Old 02-25-2011, 10:06 PM
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Quote:
Originally Posted by 5thhorseman View Post

How long do gas mask filters typically last, in terms of constant use? I know it varies depending on what they have been exposed to, but I was wondering if there is an approximate lifespan.

Also, how do you know when its time to change a filter? Does it get harder to breath through them? I honestly don't know.
A typically filter stored in a cool dry place will last for 4 to 5 years, manufacturer always print it - also 4 to 5 years.

After that period, certain properties in the filter will lose its effectiveness, so if your life depends on it, change and store new ones, don't save on the few dollars.

Generally in a heavily gas/chemcials contaminated area, the filter last about 45 minutes. Yes, when the breathing gets harder, its time to change, when changing, take one last breath and hold your breath, then change, after changing, release the breath (breath out) before breathing in, to expel any contaminated air within the mask while changing the filter.

Remember, choose the right mask and filter combination(s) for the right protection!
Old 02-26-2011, 01:39 PM
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Quote:
Originally Posted by dtcepl View Post
Generally in a heavily gas/chemcials contaminated area, the filter last about 45 minutes. Yes, when the breathing gets harder, its time to change, when changing, take one last breath and hold your breath, then change, after changing, release the breath (breath out) before breathing in, to expel any contaminated air within the mask while changing the filter.
Just upgraded to the newer M50 gas mask models for the latest exercise on my base. -They're really nice... and a good bit more comfortable than the older ones.

One cool thing about them is the dual canisters, and the valves for them. When a canister is removed, a valve closes and prevents air from flowing through the open hole.
Since there are two canisters like this, you can change one at a time while breathing normally. Pretty cool.
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Old 02-26-2011, 06:49 PM
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Anyone know if this is a legit dealer for a gas mask?

http://www.interamer.com/Masks.htm
Old 02-27-2011, 06:22 AM
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Quote:
Originally Posted by ocalhoun View Post
Just upgraded to the newer M50 gas mask models for the latest exercise on my base. -They're really nice... and a good bit more comfortable than the older ones.

One cool thing about them is the dual canisters, and the valves for them. When a canister is removed, a valve closes and prevents air from flowing through the open hole.
Since there are two canisters like this, you can change one at a time while breathing normally. Pretty cool.
Thanks, great recommendation and advice

I am currently in debt and low on savings, currently I got a full face mask and a half face mask with screwed-in filter of the highest filtration grade. Hope by end 2011, I could get out of the debt situation and purchase more gear, your recommendation is definitely one of my consideration.

I guess you are in the Military when you mentioned .....base......can you aim and shoot with canisters on both your face? When I am doing my Chemical training, my canister is always on my left side of my face since I am a right hander. Currently, my full-face mask canister mount is in the front, not that ideal too!
Old 02-27-2011, 01:38 PM
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Quote:
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I guess you are in the Military when you mentioned .....base......can you aim and shoot with canisters on both your face?
That's a disadvantage of the new masks...
The canisters are slim, so it isn't too bad, but yes, they do get in the way of cheek weld when shooting.
You have to hold your head at a sharper angle to get a good sight picture with a long gun. (or hold the gun at an angle)
(Or, you could remove one filter and use only the other one. I wouldn't risk it if the contaminant was deadly, like a bio-agent... but for just a chemical irritant that would be an option.)

That said, I'd still take the newer ones for shooting in contaminated air. The advantages outweigh this minor disadvantage by a lot, especially if you get in some practice shooting with the mask on.
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Old 02-27-2011, 02:10 PM
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Quote:
Originally Posted by ocalhoun View Post
One cool thing about them is the dual canisters, and the valves for them. When a canister is removed, a valve closes and prevents air from flowing through the open hole.
Since there are two canisters like this, you can change one at a time while breathing normally. Pretty cool.
As an CBRN Instructor and current M50 mask user, let me advise this when changing filters in a toxic environment: Don't do it! Better to wait until any vapor hazard has passed and then if necessary to change filters use the buddy system. i.e.; Hold your mask against your face to preserve the seal and have your battle buddy change the filter for you, while holding your breath and then re-clear the mask before breathing normally. Only do solo swaps when no other options are available, and then only in relatively clear environments.
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Old 02-27-2011, 02:44 PM
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Quote:
Originally Posted by DaarkMatter View Post
As an CBRN Instructor and current M50 mask user, let me advise this when changing filters in a toxic environment: Don't do it! Better to wait until any vapor hazard has passed and then if necessary to change filters use the buddy system. i.e.; Hold your mask against your face to preserve the seal and have your battle buddy change the filter for you, while holding your breath and then re-clear the mask before breathing normally. Only do solo swaps when no other options are available, and then only in relatively clear environments.
Of course.
Just pointing out that it can be done without holding your breath.
Old 02-27-2011, 09:28 PM
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Quote:
Originally Posted by DaarkMatter View Post
As an CBRN Instructor and current M50 mask user, let me advise this when changing filters in a toxic environment: Don't do it! Better to wait until any vapor hazard has passed and then if necessary to change filters use the buddy system. i.e.; Hold your mask against your face to preserve the seal and have your battle buddy change the filter for you, while holding your breath and then re-clear the mask before breathing normally. Only do solo swaps when no other options are available, and then only in relatively clear environments.

Thanks for the great advice!
Old 05-11-2011, 07:17 PM
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would a filter like this http://www.uline.com/Product/Detail/...sses-Cartridge stop tear gas?
Old 05-11-2011, 08:21 PM
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Hi there. For Cs/Cn, I believe the rating for the filter should be P100... that gives a filtration of 99.9+% for particulates. Almost any filter for respirators/gas masks will have this rating... or will come with a P100 pre-filter that snaps or slides over the intake port of the main filter or canister. Other chems will likely take a bit more... most filters/canisters will come with a list of agents it is effective against... usually it is a limited list that represents many more than what is listed.

Once a filter is opened (removed from original package), usually it has a lifespan of 1 year, if not exposed to nasties. Each filter/canister is different, so read directions... there is often an abundance of info for any filter. Unopened, many filters have a shelf life of up to 10 years... this info should be printed on filter/package... or manufacturer website.

It is probably a good idea to have a few canisters that are CBRN rated and a good number of the (usually cheaper) industrial materials filters. You can get adapters which screw into 40mm thread on mask and allow the attachment of bayonet style cartridges used for many respirators.

Good luck!
Old 08-02-2013, 03:48 AM
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thanks my friend.
Old 01-21-2014, 03:12 PM
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Since we are on the subject of gas mask parts. Does anyone know how to replace the lenses attached to an M40 mask? Not the outserts but the ones attached to the mask itself?
Old 01-21-2014, 03:38 PM
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Quote:
Since we are on the subject of gas mask parts. Does anyone know how to replace the lenses attached to an M40 mask? Not the outserts but the ones attached to the mask itself?
If I remember correctly, that's depot level maintenance or unserviceable. Not sure which, but I cant remember ever repairing any of mine.
Old 01-25-2014, 01:44 PM
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I recently purchased a survivair opti-fit T SERIES M with 4 sealed filters. I've been storing the mask in a zip-block bag with the filters separate in their original packaging (sealed).

In the case on a Nuclear / Bio attack we only have minutes to get the mask on.
Would it be wise to attach 2 of my filters onto the mask and store everything in sealed zip-block?
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