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Old 01-15-2009, 03:44 PM
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Default The C2A1 Filter: The Good, The Bad, The Recalled



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Just a brief note on effectiveness of the C2A1 filter, duration of use, and the recall that took place a few years back.

The C2A1 filter has a place in lots of survivalists CRBN preps due to its effectiveness, cost, and relatively long life in storage. It doesn't hurt that it is the current issue filter for the US Armed Services as well as Canada and other forces as well.
Made here in the US by 3M, it incorporates a p100 level particulate filter and activated carbon to protect against a large number of threats, including Sarin and its companion DMMP, Hydrogen Cyanide, Phosgene, Chlorine, Sulphur Dioide, Hydrogen Chloride, CS and CN (tear) gas, the blood agent CK and the nasty pseudo-nerve agent PS.
It does not protect against ammonia or ammonium-based compounds, and it's duration against some of the agents listed here range from a high of around 8 hours for tear agents to a low of just 15 minutes for Sulphur Dioxide. The average duration before the filter begins to lose effectiveness is around 20 to 30 minutes for most of the other agents.
Plan your preps accordingly.

In 2006 the Army identified a number of lots of the C2A1 filters that "might not provide a correct standard of protection" and so sent them for testing. The ones that passed were stenciled with a large "T" on the side; they are good as gold. The ones that failed, or at least some of them, were, you guessed it, surplussed off. I've seen some of these filters appear for sale on ebay. The following lot #s should be considered safe for use with riot agents or for practice use only:
MMB03B031-001
MMB03E035-007
MMB03G035-015
MMB03B033-001
MMB03E035-008
MMB03G035-016A
MMB03C035-001
MMB03E035-009
MMB03G035-016B
MMB03C035-002
MMB03E035-010
MMB03G035-017
MMB03C035-003
MMB03F035-011
MMB03H035-018
MMB03D035-004
MMB03F035-012
MMB03H035-019
MMB03D035-005
MMB03F035-013
MMB03H035-020
MMB03D035-006
MMB03G035-014
MMB04K035-060
MMB03J035-021
MMB04A035-033
MMB04D035-045
MMB03J035-022
MMB04A035-034
MMB04E035-046
MMB03J035-023
MMB04A035-035
MMB04E035-047
MMB03K035-024
MMB04A035-036
MMB04E035-048
MMB03K035-025
MMB04B035-037
MMB04F035-049
MMB03K035-026
MMB04B035-038
MMB04F035-050
MMB03K035-027
MMB04B035-039
MMB04F035-051
MMB03L035-028
MMB04C035-040
MMB04G035-052
MMB03L035-029
MMB04C035-041
MMB04G035-053
MMB03M035-030
MMB04C035-042
MMB04H035-054
MMB03M035-031
MMB04D035-043
MMB04H035-055
MMB03M035-032
MMB04D035-044
MMB04J035-056
MMB04J035-057
MMB04L035-065
MMB05B035-072
MMB04J035-058
MMB04L035-066
MMB05C035-073
MMB04J035-059
MMB04L035-067
MMB05C035-074
MMB04K035-061
MMB05A035-068
MMB05C035-075
MMB04K035-062
MMB05A035-069
MMB05C035-076
MMB04K035-063
MMB05A035-070
MMB05E035-077
MMB04L035-064
MMB05B035-071
MMB05E035-078
MMB03L035-028
MMB04C035-040
MMB04G035-052
MMB03L035-029
MMB04C035-041
MMB04G035-053
MMB03M035-030
MMB04C035-042
MMB04H035-054
MMB03M035-031
MMB04D035-043
MMB04H035-055
MMB03M035-032
MMB04D035-044
MMB04J035-056
MMB04J035-057
MMB04L035-065
MMB05B035-072
MMB04J035-058
MMB04L035-066
MMB05C035-073
MMB04J035-059
MMB04L035-067
MMB05C035-074
MMB04K035-061
MMB05A035-068
MMB05C035-075
MMB04K035-062
MMB05A035-069
MMB05C035-076
MMB04K035-063
MMB05A035-070
MMB05E035-077
MMB04L035-064
MMB05B035-071
MMB05E035-078


Oh, and the shelf life of the C2A1 is supposedly 10 years, but I've seen several army documents extending the shelf life of some of the plastic canned (not the tin can versions) up to 12 years or longer....for what that is worth.
Date of manufacture is going to be the first two numbers and letter...so MMB05A035-01 is January 2005 manufacture.
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Old 01-15-2009, 06:47 PM
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For the benefit of newcomers who haven't encountered it on the site yet, this is called quality information.

Thanks, Cammobunker; you are definitely welcome here.
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Old 01-19-2009, 09:47 AM
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I would not use any protective mask that is not approved/used by our military. I suggest you visit: http://www.nationalterroralert.com/gasmasks/
The site also identifies recommended/approved protective masks and filters and also not usable expired filters, to include the C2 and C2A1, and a few masks.
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Old 01-19-2009, 04:10 PM
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Thanks a bunch for this golden list cammobunker!
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Old 01-19-2009, 05:02 PM
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Quote:
GAS MASK FILTER: AMERICAN C2 (check exp. date) & C2A1 STATUS: EXPIRED -If more than 10 years old ** (old filters are known to have Chromium Toxicity ** and are considered highly dangerous) DETAILS: To find out if your filter is expired, you must find the printed date of manufacture. Look for the serial number on the can: For Example: RFT 920000CF24054 (sample serial #) (first 2 digits are the year of manufacture) In this example the mfg date: RFT [92] is 1992

These are 100% military surplus filters. The military discontinued use of the C2 in favor of the new/better C2A1 filters.


http://www.nationalterroralert.com/gasmasks/
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Old 03-30-2011, 08:19 AM
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I have a military issue C2A1 filter in plastic container with LOT:MMB04B035-037T, is this one ok as it's not on cammobunker's list and it has a "T" at the end of the LOT number?
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Old 03-30-2011, 11:36 AM
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That is some decent information, but your list is 5 years old. Another concern is you don't mention is the C2 series are NOT reated for industrial chemicals which are more lethal. The chemical list you provided is for battlefield concentrations.

Here is a cut-n-paste from the T.O. on canister service life:
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Old 04-10-2011, 11:46 PM
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I've seen some places advertise this model as NBC and other places just as BC Bio/Chem. Does anyone know which is it?

http://www.armygasmasks.com/Current-...aaagas-157.htm
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Old 04-11-2011, 12:23 AM
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great info. i vote for sticky!
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Old 04-11-2011, 08:00 AM
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Quote:
Originally Posted by Jack_Bauer View Post
I have a military issue C2A1 filter in plastic container with LOT:MMB04B035-037T, is this one ok as it's not on cammobunker's list and it has a "T" at the end of the LOT number?
I believe the 'T' that is stamped on the filter/canister is large... not just a letter as part of the serial#.
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Old 04-11-2011, 07:02 PM
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Quote:
Originally Posted by Captain Bomblast View Post
I believe the 'T' that is stamped on the filter/canister is large... not just a letter as part of the serial#.
Filters do not have sizes.

The "T" denotes a change in production. This change does not affect the serviceability of the item. Sometimes, it has something to do with a change in the method of production.
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Old 04-11-2011, 07:24 PM
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Quote:
Originally Posted by Chili View Post
Filters do not have sizes.

The "T" denotes a change in production. This change does not affect the serviceability of the item. Sometimes, it has something to do with a change in the method of production.
I meant that the "T" is a big "T" stamped on the canister... not that the "T" meant the canister was a large size. Sorry if that was confusing... I was trying my best to be clear.
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Old 04-11-2011, 07:52 PM
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Ok so I did order filters on ebay they say they are isaeli and have the markings
M-III-76-318... should i be concerned?
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Old 04-11-2011, 08:49 PM
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Quote:
Originally Posted by mrnmrssmith View Post
Ok so I did order filters on ebay they say they are isaeli and have the markings
M-III-76-318... should i be concerned?
I don't know what those markings would mean... I'm trying to find specific info on how the lot # is laid out. The writing on the filters I have is all in Hebrew, but there are some numbers. For example, there is a # stamped on the threaded end of the canister, which I assume is the lot #... it is 926532. Also, on the side, there is a bar code w/ 9200 07/06/2004 on it... meaning the year of manufacture is 2004. The sticker with Hebrew on it is likely instructions on how to work the tab and cover on the inlet end.

When I buy on eBay, I always ask what the date of manufacture/expiration date is on the filters... if they can't answer, I don't buy. There are TONS of crappy, out-of-date filters being sold.
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Old 04-11-2011, 09:24 PM
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thanks should be here tomorrow, and i will ask that question next time i buy
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Old 04-12-2011, 04:39 PM
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Quote:
Originally Posted by mrnmrssmith View Post
Ok so I did order filters on ebay they say they are isaeli and have the markings
M-III-76-318... should i be concerned?
It's most likely a specification number or part number.
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Old 04-12-2011, 04:40 PM
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Quote:
Originally Posted by Captain Bomblast View Post
I meant that the "T" is a big "T" stamped on the canister... not that the "T" meant the canister was a large size. Sorry if that was confusing... I was trying my best to be clear.
IMPO it means training filter.
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Old 04-12-2011, 07:20 PM
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Quote:
Originally Posted by Chili View Post
IMPO it means training filter.
Thanks for letting me know that.
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Old 04-12-2011, 07:24 PM
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Quote:
Originally Posted by Chili View Post
IMPO it means training filter.
Also, according to the OP -and according to the information I have seen- the 'T' was stamped on the canisters that had suspect lot numbers, had been tested and were good to go... not 'T' for training.

Did you see information that said the 'T' stood for training? Please post it if you can find it.
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Old 04-12-2011, 07:32 PM
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BTW, here is the bulletin that explains how the canisters should be marked after testing, as well as a list of recalled lot numbers... the explanation about the 'T' marking is toward the bottom. Enjoy.

http://dcfpnavymiltai.org/library/me...1102ZJUL06.htm
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