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gas mask question

i have a resperator, but i dont know if this will protect me from the gas and spray the cops use
is there a way i can tell
what should someone look for when they go shopping for a gasmask and where, on a budget?
thanks for any help
see ya in the streets!

respirator wont work 11.Mar.2007 16:27


it won't protect you. go to andy and bax's (or another army surplus) you can get a full face one for cheap

air and masks 12.Mar.2007 00:53

kirsten anderberg kirstena@resist.ca

Once I did research for an article I was going to write about gas mask safety for protests, and what I remember being said over and over again is that the SEAL AGAINST OUTSIDE AIR is #1 important YET GETTING AIR TO BREATHE is equally important so there needs to be a way for you to have a tight seal, but also for you to breathe. The places I looked seemed to cite not getting proper oxygen and intense overheating as serious issues with gas masks. I remember people saying that the problem with USED gas masks is the seal is broken down most often, thereby rendering the masks useless. Again, I do not know much about this, but I do remember these issues as standing out. I seriously doubt a respirator would help against pepper spray, etc.

some info 12.Mar.2007 09:15


I've had training in "gas masks." Here's some stuff I've learned.

Respiratory protection includes:
Full Face Air Purifying Respirator (APR) or
Self Contained Breathing Apparatus (SCBA).

Air purifying respirators for protection against gases or vapors should be equipped with an end-of-service life indicator (ESLI).

There are two basic steps in determining the fit of a respirator:
1. Quantitative fit testing (actual measurement of fit). 2. User seal checks (checking the respirator in negative pressure mode each time you use it).

Quantitative fit testing (QNFT) is performed to objectively verify that the user is capable of getting a good face-to-facepiece seal. This testing is done when the respirator is first issued.

A user seal check of the face-to-facepiece seal should be performed by the respirator user EVERY TIME THE MASK IS WORN. This is usually performed using a positive or negative pressure check.

Individuals with facial hair that interferes with the respirator face seal or exhalation valve (e.g. beard, large moustache, sideburns, large goatee) are not permitted to wear respirator masks designed to fit tightly. More than 24-hours of beard growth is unacceptable. Quantitative fit testing will not be performed for those with facial hair because they occasionally pass the test, which can give false sense of security.

The following requirements are applicable to all qualitative fit tests (QLFT) and quantitative fit tests (QNFT):
1. Allow subject to pick most acceptable respirator from adequate selection.
2. Shows subject how to put respirator on and adjust position and strap tension, and how to determine acceptable fit. Have a mirror available. (This instruction is considered a review, not the formal training which is also required separately.)
3. Inform subject that he/she is being asked to select the respirator with the most acceptable fit; that each respirator is a different size and shape; and that a properly fitted respirator used correctly will provide adequate protection.
4. Instruct subject to hold each chosen facepiece up to the face and eliminate those that obviously do not fit.
5. Take note of the more acceptable facepieces, and have the subject don the most comfortable one and wear for at least 5 minutes to assess comfort. If subject is unfamiliar with the particular mask, have him/her don and adjust the mask several times to practice strap tension adjustment.
6. Comfort assessment is made by considering position of mask on nose, room for eye protection, room to talk, position of mask on face and cheeks.
7. Adequacy of fit should consider proper chin placement, straps not overly tightened, fit across nose bridge, respirator adequately spans nose-to-chin distance, tendency of respirator to slip, and self observation in mirror to evaluate fit and position.
8. Have subject move head slowly up and down, and side to side while breathing deeply. Conduct seal check as described in the Appendix (negative or positive check, or equivalent instruction by manufacturer). If seal check fails, select another facepiece.
9. Do not conduct fit test if there is any hair growth between the skin and the facepiece sealing surface, such as stubble beard growth (more than one day's growth), beard, mustache, or sideburns which cross the respirator sealing surface. Alter or remove any apparel that interferes with fit.
10. If subject exhibits difficulty breathing during the tests, refer him/her to a Practicing Licensed Health Care Practitioner (PLHCP).
11. If subject finds fit unacceptable, he/she shall be given other respirators to choose from, and then retested.
12. Instruct subject on what to do during the fit test, including the various test exercises. Respirator must be worn at least 5 minutes before conducting fit test.
13. During the test, the subject should wear any safety equipment that may be worn during the actual use, which may interfere with respirator fit.
14. Perform the eight test exercises listed below (exclude grimace exercise for QLFT. Also, Controlled Negative Pressure QNFT has its own exercise protocol). Perform each exercise for 1 minute, except the grimace exercise should last only 15 seconds. Any adjustment of the mask once the test has begun voids the test. The eight tests are listed below:
a. Normal breathing.
b. Deep Breathing.
c. Turning head side to side.
d. Moving head up and down.
e. Talking (Subject can read "Rainbow Passage" contained in this Appendix.
f. Grimace (only for QNFT, not for QLFT).
g. Bending over.
h. Normal breathing.

You should check the face-to-facepiece seal of your respirator for leaks before each use using the positive pressure check, negative pressure check, or both.
Positive Pressure Check
l To perform the positive pressure check, first put on the mask and tighten the straps to a comfortable tension.
l Then, using the palm of your hand, cover the mask's exhalation valve, blow gently to see if you can cause slight pressure to build up inside the mask. (You may have to first remove the exhalation valve cover.)
l If pressure builds without evidence of leakage, you have a satisfactory face fit. Be careful not to press too hard on the valve as this can also affect fit.
Negative Pressure Check
l To perform the negative pressure check, first put on the mask and tighten the straps to a comfortable tension.
l Then using the palms of both hands to cover the discharge on each filter cartridge, inhale gently to see if you can cause suction to build up inside the mask. The mask should collapse inward against your face when you inhale, and stay collapsed for at least 10 seconds as you hold your breath without any indication of inward leakage of air.
l If it does, you have a satisfactory fit. Again, be careful.

If you are wearing a respirator for protection against a material, which can be smelled or tasted, you should not be able to sense the contaminant if your respirator is fitted and operating properly.

Color codes for filters used against the more common air contaminants are listed as follows. The respirator manufacturer's literature must always be checked before selecting a respirator cartridge.

Air Contaminant Color(s) Assigned

Organic Vapors............Black
Acid Gases........................White
Organic Vapors and
Acid Gases.....................Yellow
Organic Vapors &
Particles w/TWA less than 0.05 mg/m3............Magenta (purple)
Ammonia Gas...................Green
Chlorine Gas....................White w/yellow stripe