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LogicaL Chaos
Ascension Energy & Alien UFOs




Registered: 05/12/07
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Can moisture travel thru a polyfill filter?
#21682457 - 05/15/15 10:26 AM (8 years, 8 months ago) |
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So, i have these PF jars with special polyfill lids (like a grain jar would have).
Can moisture pass thru the polyfill or is it only filtered dry air?
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tripdawg420
low life with no life



Registered: 02/02/09
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Re: Can moisture travel thru a polyfill filter? [Re: LogicaL Chaos]
#21682496 - 05/15/15 10:40 AM (8 years, 8 months ago) |
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hyu on earth would you use poly on a cake ive never had it happen to me but i would imagaine it could sitting on a moist cake
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SpinScratch
Distrusted Cultivator


Registered: 07/26/13
Posts: 826
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Re: Can moisture travel thru a polyfill filter? [Re: LogicaL Chaos]
#21682506 - 05/15/15 10:43 AM (8 years, 8 months ago) |
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In my experience using grain jars with polyfill. Yes moisture escapes, because the top layer of grain usually dries out.
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Mad Season
hookers and blackjack



Registered: 09/16/12
Posts: 12,666
Loc: Canada
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Re: Can moisture travel thru a polyfill filter? [Re: SpinScratch]
#21682532 - 05/15/15 10:55 AM (8 years, 8 months ago) |
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Do you have a dry verm layer? Because you haven't said one way or the other lol
On a side note.. I seriously doubt a dry verm layer doesn't wick away moisture and exchanges dry air too. A tight polyfil filter won't do any different realistically.
Edited by Mad Season (05/15/15 10:59 AM)
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Can moisture travel thru a polyfill filter? [Re: LogicaL Chaos] 1
#21682657 - 05/15/15 11:26 AM (8 years, 8 months ago) |
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Quote:
LogicaL Chaos said: So, i have these PF jars with special polyfill lids (like a grain jar would have).
Can moisture pass thru the polyfill or is it only filtered dry air?
it's fine. I made PF cakes in quart jars with poly lids all the time

I have SFD lids now but poly work just fine.
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LogicaL Chaos
Ascension Energy & Alien UFOs




Registered: 05/12/07
Posts: 69,359
Loc: The Inexpressible...
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Re: Can moisture travel thru a polyfill filter? [Re: bodhisatta]
#21683815 - 05/15/15 04:40 PM (8 years, 8 months ago) |
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nIce!
So u fruit them within the quart jar? Do u use the jar as a monotub then or is the jar in a terrimum?
And yes, i made a classic PF jar with a dry vermiculite layer.
Its a poly lid with red RTV silion injection ports. It worked percfectly, only had one infection out of five jars
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Kizzle
Misanthrope


Registered: 08/30/11
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Re: Can moisture travel thru a polyfill filter? [Re: LogicaL Chaos]
#21683872 - 05/15/15 05:03 PM (8 years, 8 months ago) |
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Water vapor is a gas. It can pass through anything air can. There's no way to trap humidity while allowing dry air to pass through freely with any kind of filter if that's you mean.
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
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Re: Can moisture travel thru a polyfill filter? [Re: Kizzle]
#21683902 - 05/15/15 05:15 PM (8 years, 8 months ago) |
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Quote:
Kizzle said: Water vapor is a gas. It can pass through anything air can. There's no way to trap humidity while allowing dry air to pass through freely with any kind of filter if that's you mean.
they developed tyvek home wrap specifically to keep water vapor from going across but still being air permeable. sure you could force water vapor through if you have a pressure differential but a gradient isn't enough to make it transverse.
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Kizzle
Misanthrope


Registered: 08/30/11
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Re: Can moisture travel thru a polyfill filter? [Re: bodhisatta]
#21683934 - 05/15/15 05:22 PM (8 years, 8 months ago) |
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That's not what it does. It prevents water droplets from passing through like from rain and mist. It still allows water vapor through.
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Kizzle
Misanthrope


Registered: 08/30/11
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Re: Can moisture travel thru a polyfill filter? [Re: Kizzle] 1
#21683940 - 05/15/15 05:23 PM (8 years, 8 months ago) |
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From the Tyvek site
Is DuPont™ Tyvek® a vapor barrier?
No, DuPont™ Tyvek® is not a vapor barrier. It is made with unique material science to keep air and bulk water out while allowing moisture vapor inside walls to escape. http://www.dupont.com/products-and-services/construction-materials/building-envelope-systems/faqs/wb-faq.html
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Can moisture travel thru a polyfill filter? [Re: Kizzle]
#21683943 - 05/15/15 05:24 PM (8 years, 8 months ago) |
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ah you're right, I thought I always read it was a vapor barrier
if you make your lids properly though moisture loss isn't going to be a problem in the time frame it takes to colonize.
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mushpunx
Fungus Punk



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Re: Can moisture travel thru a polyfill filter? [Re: Kizzle]
#21683971 - 05/15/15 05:29 PM (8 years, 8 months ago) |
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Im sure the poly works fine but for PF jars I prefer 2 layers of craft felt between the band and the lid!
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Kizzle
Misanthrope


Registered: 08/30/11
Posts: 9,855
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Re: Can moisture travel thru a polyfill filter? [Re: bodhisatta]
#21683989 - 05/15/15 05:32 PM (8 years, 8 months ago) |
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Yeah. I've had agar cultures in PP contains with a cotton filter go several months without drying out and agar is far more prone to drying out than a PF or spawn jar.
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