Packs,Gas Masks,Radios

[Ian]

I helped design the S10, the NBC drinking mechanism is mine with input on other facets.

The filters degrade with time. If they are past their use by date they probably won't work with war or riot gasses but the particulate filter part is good for a long, long while.

No gas mask is airtight, they all leak. The S10 has an 'actual protection factor' (PF) of about 50 i.e. what is inside is about 1/50th of what is outside. But only in ideal conditions. Working hard, sweating, 5 o'clock shadow, it degrades to about a PF of 10-20. This is one reason why fit is so important with four sizes available.

I can't see any reason why you want such a mask, you are never going to be exposed to war gasses and if you are looking to riot gasses or particulates e.g. fallout, there are much better, more comfortable and cheaper alternatives. and lighter, longer lived, cheaper cartridges.

P.S. the 40mm thread is a DIN standard for glass bottle-neck threads if you like trivia.

[Attack Warning Red]

Wow, cool Ian! The S10 is an amazing design.

I collect cold war and NBC stuff, hence I have a few of these items. I do the suction test and they seem airtight to me. But I always keep at least one in working order - just in case...

[newdawnfades]

I helped design the S10, the NBC drinking mechanism is mine with input on other facets.

The filters degrade with time. If they are past their use by date they probably won't work with war or riot gasses but the particulate filter part is good for a long, long while.

No gas mask is airtight, they all leak. The S10 has an 'actual protection factor' (PF) of about 50 i.e. what is inside is about 1/50th of what is outside. But only in ideal conditions. Working hard, sweating, 5 o'clock shadow, it degrades to about a PF of 10-20. This is one reason why fit is so important with four sizes available.

I can't see any reason why you want such a mask, you are never going to be exposed to war gasses and if you are looking to riot gasses or particulates e.g. fallout, there are much better, more comfortable and cheaper alternatives. and lighter, longer lived, cheaper cartridges.

P.S. the 40mm thread is a DIN standard for glass bottle-neck threads if you like trivia.

Hi Ian...thats quality that you got experience when it comes to raspirators...probably will have some question s in the future becouse you would probably know better what yopu talking about...i was lookin into this site for raspirators...take a look...Link Bellow!

http://www.avon-protection.com/

[Dogfood]

I helped design the S10, the NBC drinking mechanism is mine with input on other facets.

The filters degrade with time. If they are past their use by date they probably won't work with war or riot gasses but the particulate filter part is good for a long, long while.

No gas mask is airtight, they all leak. The S10 has an 'actual protection factor' (PF) of about 50 i.e. what is inside is about 1/50th of what is outside. But only in ideal conditions. Working hard, sweating, 5 o'clock shadow, it degrades to about a PF of 10-20. This is one reason why fit is so important with four sizes available.

I can't see any reason why you want such a mask, you are never going to be exposed to war gasses and if you are looking to riot gasses or particulates e.g. fallout, there are much better, more comfortable and cheaper alternatives. and lighter, longer lived, cheaper cartridges.

P.S. the 40mm thread is a DIN standard for glass bottle-neck threads if you like trivia.

Hey Ian,

What is the science in the filter why wont they work after the use by date ?

[Ian]

Sorry just noticed this.

The filters are multi layer and multi compound. Various particulate filters with finer meshes to remove dusts and aerosols, then a mix of materials. Many war gasses are acid so there are neutralising agents and activated charcoal for adsorbing some others. These slowly react with each other and destroy adsorption capacity

Storage is always a problem and temperature changes and vibration can break down the filler structure allowing channels to form in the canister so gas passes straight through.

Oxygen will slowly penetrate the foil packaging and oxidise the contents.

All of this limits the active life of the cannister and an informed guess is made as to its longevity. There is a lot of experience and info to guide the guess.

Accelerated environmental tests are made to ensure that the guess is about right and tests are made over time to ensure that batches are still useful and haven't degraded.

Surplus military cannisters are probably useless or stolen. The military are not known for throwing away expensive kit that is still OK. If you must have them it is probably better to buy civilian vapour filters and stacking particulate filters.

I still wonder why anyone would need such a mask and filters. You will never be exposed to war gasses and a simple particulate filter would protect from fallout.

[Dogfood]

Sorry just noticed this.

The filters are multi layer and multi compound. Various particulate filters with finer meshes to remove dusts and aerosols, then a mix of materials. Many war gasses are acid so there are neutralising agents and activated charcoal for adsorbing some others. These slowly react with each other and destroy adsorption capacity

Storage is always a problem and temperature changes and vibration can break down the filler structure allowing channels to form in the canister so gas passes straight through.

Oxygen will slowly penetrate the foil packaging and oxidise the contents.

All of this limits the active life of the cannister and an informed guess is made as to its longevity. There is a lot of experience and info to guide the guess.

Accelerated environmental tests are made to ensure that the guess is about right and tests are made over time to ensure that batches are still useful and haven't degraded.

Surplus military cannisters are probably useless or stolen. The military are not known for throwing away expensive kit that is still OK. If you must have them it is probably better to buy civilian vapour filters and stacking particulate filters.

I still wonder why anyone would need such a mask and filters. You will never be exposed to war gasses and a simple particulate filter would protect from fallout.

Thanks Ian was just interested was all was never explained during NBC training when I was in the forces, but hey , now I know cheers.

[ELM]

Being in the ATC does help since you can get cheap equipment from the RAF and NATO.

[the-gnole]

Being in the ATC does help since you can get cheap equipment from the RAF and NATO.

Still the ATC, even with their new corporate title.



Shh, don't tell everyone about the cheap gear though, they'll all want some

[ELM]

THey might all want some but I doubt that they'll get it.

[TomW]

After a bit of research found the Scott A2P3 filter. Product info states its good against radiation as well as biological threats. Uses a 40mm thread and gives 50 minutes of protection. At just under a tenner each they're very competitively priced for a new, in date filter with a 4 year shelf life. I'll be ordering a couple as a test so will review what they're like working with an s10 then. Roll on payday Will also add some links but its a pita from my phone so will have to wait till morning now