How often should these be replaced? Once the package is open - what is the shelf-life?
1057595
Directly from 3M Technical Data Bulletin #137P-SERIES TIME USE LIMITATIONDispose of the filter when it becomes damaged, soiled, or difficult to breathe through if the filter is used in environments that contain no oil aerosols, or if the filter is used in environments that contain a mixture of oil and non-oil aerosols. If used in environments containing only oil aerosols, dispose of filter after 40 hours of use or 30 days, whichever is first.
1057596
It all depends on how much you use them, but for me i use them everyday with high dust content so I replace them every few months
1057597
"dispose of filter after 40 hours of use or 30 days, whichever is first" - http://multimedia.3m.com/mws/mediawebserver?6666660Zjcf6lVs6EVs6662M_COrrrrQ-&WT.m;c_id=www.3m.com/filterchange
1057598
They should not deteriorate if they are kept dry, however avoid moist and dusty environments while storing. Usually I get about 40 work hours in a medium dusty and noxious environment.Hope this helps!
1057599
"dispose of filter after 40 hours of use or 30 days, whichever is first" - http://multimedia.3m.com/mws/mediawebserver?6666660Zjcf6lVs6EVs6662M_COrrrrQ-&WT.mc_id=www.3m.com/filterchange
1820868
I believe there should be an expiration date on the package. I would say you could keep them for a while at room temperature. After a week I would put them in the frig. The package is usually eaten up by then though for me. Hope this helps. :)
126348
Since packages are about right size for a family meal there is no reason to open sealed package but one at a time.. As long as packages remain sealed there shouldn't be any reason for them to go bad. We've never had a stale one.
1246827
I don't know how often you use them but I have had some for up to 6 months and haven't any trouble with them. Hope this has been helpful. Thanks Bert
1708987
If they in the SEALED package they should be good for at least a year. I have used last years leftovers with good results.
1360316
The ones I bought last month say they are good through October 2015, but I'm assuming that's unopened. Once opened I would just freeze them!
429406
Probably a month or longer. I've had them out for 6 weeks and they were working.Excellent solution. I keep the unopened ones in the freezer to keep them fresher.We use two in the pantry, rotate one each two weeks, so there is a fresh one onone shelf, while the other is two weeks or older.
176248
They are good for a couple of years according to the package. I've had them on the shelf for a year without issues. Brian
225347
I am not sure the shelf life all raped up I would not trust to be more then 6 months. I know they don't last longh after you install them even if you don't print anyting.
2149334
I'd say they're fine for 6 months or so. Have you tried then before? I would recommend tasting them before investing in bulk.
271341
My package didnt have any dates on it, but im guessing around a year which is typical shelflife of nuts after opening.
1828259
I've had mine over a year... no problems. Each cartridge is packed in a sealed plastic "bag" that it seems to me would greatly increase shelf life and prevent drying out... but they are also not "open" until you insert them into the machine so I suspect the shelf life is fairly long.
716888
We buy a year's supply at a time and find them to be fine. The packages I bought the first of 2013 have an expiration date of 12/14 so they would probably last at least 2 years, maybe longer.
1593482
I purchased mine about 6 months ago. Package says use by 9/2015 so I guess that was about 2 years shelf life. As others have stated these last much longer.
2134929
I'm sorry, I bought this a long time ago. I don't remember the shelf life. It was well sealed, so I doubt additional sealing would help.
1842539
I do know what the shelf life is as I buy two boxes every month and drink them daily. The drink pouches are sealed. Sorry I can not help more
1293029
I got a new batch which was only a few months old and did have a five year shelf life from that date. I don't remember the exact dates and they are packed in my go bag.