What are the criteria for discarding the canisters used in gas masks?
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Our gas filter canisters have been in reserve for a long time; the inspectors said they are no longer usable, but it’s unclear what criteria are used to determine whether they need to be replaced.
It is only used in emergency situations in hazardous areas; it is not used on a regular basis. The usage period has been around 3 years so far.
Under normal circumstances, as long as the user detects an unusual odor or feels discomfort, it indicates that the gas filter canister has failed (after 3,000 hours)
Take a look at this; it should be helpful. \"Test Methods for the Performance of Filters in Filter-Type Gas Masks\" http://bbs.hcbbs.com/viewthread.php?tid=240999&highlight=%B9%FD%C2%CB%CA%BD%B7%C0%B6%BE%C3%E6%BE%DF%C2%CB%B6%BE%B9%DE%D0%D4%C4%DC%CA%D4%D1%E9%B7%BD%B7%A8
I can’t be sure either; in any case, the methods I’ve seen include the following: 1. Weighing – if a gas filter weighs 15g more than before use, it can no longer be used； 2. Smell: The filter should be replaced if employees feel uncomfortable or if the gas they inhale has an unpleasant odor ； 3. Check the time – some need to be replaced after a few hours, regardless of whether they’ve been used or not ；