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Offlinehealing
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Does a canning jar produce an airtight seal?
    #22078442 - 08/11/15 08:35 PM (8 years, 5 months ago)

Does the seal on a closed canning jar allow gas or moisture to pass into or out of the jar? What about vacuum sealing plastic bags. Are vacuum sealed bags air and moisture tight, or do they allow gas and moisture to pass into or out of the bag?


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InvisibleJean-Luc Picard
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Re: Does a canning jar produce an airtight seal? [Re: healing]
    #22079823 - 08/12/15 03:17 AM (8 years, 5 months ago)

A standard canning jar is not absolutely air/water tight, as the seal material on the lid is a sort of rubber. Rubbers and plastics allow for slow diffusion of moisture and oxygen.

However, there are more factors at play. Given the extremely small exposed seal surface area and the relatively think seal path the the oxygen/moisture would have to travel (compared to say a plastic bag or something), I would guess that the actuAL diffusion rates would be ridiculously low. This guess is backed by years of performance history related to food preservation, where oxygen is one of the archnemeses.


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OfflineRebelutionsssss
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Re: Does a canning jar produce an airtight seal? [Re: Jean-Luc Picard]
    #22079862 - 08/12/15 03:50 AM (8 years, 5 months ago)

It would be so slow you wouldn't even notice it unless you came back years later


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Invisiblemustangbob3
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Re: Does a canning jar produce an airtight seal? [Re: Rebelutionsssss]
    #22079865 - 08/12/15 03:55 AM (8 years, 5 months ago)

dosent vaseline on the rim help if you need a better seal?

heard that somewhere for canning foods

or was it to wet the jar rim before putting lid on:shrug:
may have been that lol



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Edited by mustangbob3 (08/12/15 04:28 AM)


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Invisiblekoraks
Registered: 06/02/03
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Re: Does a canning jar produce an airtight seal? [Re: mustangbob3]
    #22079896 - 08/12/15 04:20 AM (8 years, 5 months ago)

Well said agmotes. Canned foods remain good for years, hence, diffusion is virtually negligible.


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InvisibleCorporal Kielbasa


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Re: Does a canning jar produce an airtight seal? [Re: koraks]
    #22080461 - 08/12/15 08:52 AM (8 years, 5 months ago)

I think it depends on if the contents were heated and under a vacuum its a tighter seal then if it was hand tightened.  Canned food keeps its seal for a long time if stored properly, hand tightened jars with herbs seem to lack luster after a while.


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Invisiblefoodsgoodtoo
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Re: Does a canning jar produce an airtight seal? [Re: Corporal Kielbasa]
    #22089706 - 08/14/15 12:18 AM (8 years, 5 months ago)

there were some sterelized bulk sub that was sterilized that contaminated within a matter of weeks maybe a month with cob web mold so depending on that factor thats your window.


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Offlineguyute22
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Re: Does a canning jar produce an airtight seal? [Re: foodsgoodtoo]
    #22101727 - 08/17/15 07:28 AM (8 years, 5 months ago)

Quote:

foodsgoodtoo said:
there were some sterelized bulk sub that was sterilized that contaminated within a matter of weeks maybe a month with cob web mold so depending on that factor thats your window.




that just means it was not fully sterilized and spores were not destroyed.

There is no way a mold spore is going to sneak into a sealed jar....


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