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fredorosa(at)gmail.com
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 Posted: Mon Nov 08, 2010 10:14 am Post subject: epoxy |
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Is it OK to keep resin in the freezer to extend shelf life for a year or more. Or does that degrade it.
Al
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jerzy_krasinski(at)sbcglo
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| Posted: Tue Nov 09, 2010 5:45 am Post subject: epoxy |
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There is a very general law in chemistry called Arrhenius law, saying that the speed of chemical destruction of whatever molecules decreases exponentially with reducing temperature ( it also decreases exponentially with increase of activation energy of that molecule, but we can not change that for a given epoxy) .
In simple words it means that you approximately double the lifetime for every 10 degrees centigrade of temperature reduction.
So, keeping it in a refrigerator at zero centigrade (20 degrees temperature reduction) would increase the lifetime by a factor of four. Holding it in a freezer (thirty or more degrees temperature reduction) would increase the lifetime by a factor of eight or more, depending on temperature.
All that is true, but there is more to it. If the stuff is a mixture of a few chemicals you might experience separation of these chemicals at low temperature and the stuff can break into layers. That does not mean that it got spoiled, but you would have to mix it again well after reheating to room temperature before future use.
Luckily, epoxy has high viscosity, which increases fast with cooling. It would be a solid in a freezer, and solids do not separate. Fast cooling would reduce the risc of separation even further.
Jerzy
From: ALFRED ROSA <fredorosa(at)gmail.com>
To: kisbuilders <kis-list(at)matronics.com>
Sent: Mon, November 8, 2010 12:10:05 PM
Subject: epoxy
Is it OK to keep resin in the freezer to extend shelf life for a year or more. Or does that degrade it.
Al
[quote][b]www.aeroelectric.com
omebuiltHELP [b]
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fredorosa(at)gmail.com
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| Posted: Tue Nov 09, 2010 6:55 am Post subject: epoxy |
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Thanks Jerzy. Certainly more economical to get a gallon of resin instead of quarts when you need it. I'll keep a quart out and freeze the rest.
Al
On Tue, Nov 9, 2010 at 8:41 AM, jerzy krasinski <jerzy_krasinski(at)sbcglobal.net (jerzy_krasinski(at)sbcglobal.net)> wrote:
[quote]There is a very general law in chemistry called Arrhenius law, saying that the speed of chemical destruction of whatever molecules decreases exponentially with reducing temperature ( it also decreases exponentially with increase of activation energy of that molecule, but we can not change that for a given epoxy) .
In simple words it means that you approximately double the lifetime for every 10 degrees centigrade of temperature reduction.
So, keeping it in a refrigerator at zero centigrade (20 degrees temperature reduction) would increase the lifetime by a factor of four. Holding it in a freezer (thirty or more degrees temperature reduction) would increase the lifetime by a factor of eight or more, depending on temperature.
All that is true, but there is more to it. If the stuff is a mixture of a few chemicals you might experience separation of these chemicals at low temperature and the stuff can break into layers. That does not mean that it got spoiled, but you would have to mix it again well after reheating to room temperature before future use.
Luckily, epoxy has high viscosity, which increases fast with cooling. It would be a solid in a freezer, and solids do not separate. Fast cooling would reduce the risc of separation even further.
Jerzy
From: ALFRED ROSA <fredorosa(at)gmail.com (fredorosa(at)gmail.com)>
To: kisbuilders <kis-list(at)matronics.com (kis-list(at)matronics.com)>
Sent: Mon, November 8, 2010 12:10:05 PM
Subject: KIS-List: epoxy
Is it OK to keep resin in the freezer to extend shelf life for a year or more. Or does that degrade it.
Al
| Quote: | www.aeroelectric.com
omebuiltHELP [url=http://www.homebuilthelp.com/][/url]
_blank">www.aeroelectric.com
.com" target="_blank">www.buildersbooks.com
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et="_blank">http://www.matronics.com/Navigator?KIS-List
tp://forums.matronics.com
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richard_trickel(at)yahoo.
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| Posted: Tue Nov 09, 2010 8:56 am Post subject: epoxy |
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I would email the manufacture.with this question. I have done it myself but never kept it in for a long period of time
Rich
--- On Tue, 11/9/10, jerzy krasinski <jerzy_krasinski(at)sbcglobal.net> wrote:
| Quote: |
From: jerzy krasinski <jerzy_krasinski(at)sbcglobal.net>
Subject: Re: epoxy
To: kis-list(at)matronics.com
Date: Tuesday, November 9, 2010, 1:41 PM
There is a very general law in chemistry called Arrhenius law, saying that the speed of chemical destruction of whatever molecules decreases exponentially with reducing temperature ( it also decreases exponentially with increase of activation energy of that molecule, but we can not change that for a given epoxy) .
In simple words it means that you approximately double the lifetime for every 10 degrees centigrade of temperature reduction.
So, keeping it in a refrigerator at zero centigrade (20 degrees temperature reduction) would increase the lifetime by a factor of four. Holding it in a freezer (thirty or more degrees temperature reduction) would increase the lifetime by a factor of eight or more, depending on temperature.
All that is true, but there is more to it. If the stuff is a mixture of a few chemicals you might experience separation of these chemicals at low temperature and the stuff can break into layers. That does not mean that it got spoiled, but you would have to mix it again well after reheating to room temperature before future use.
Luckily, epoxy has high viscosity, which increases fast with cooling. It would be a solid in a freezer, and solids do not separate. Fast cooling would reduce the risc of separation even further.
Jerzy
From: ALFRED ROSA <fredorosa(at)gmail.com>
To: kisbuilders <kis-list(at)matronics.com>
Sent: Mon, November 8, 2010 12:10:05 PM
Subject: epoxy
Is it OK to keep resin in the freezer to extend shelf life for a year or more. Or does that degrade it.
Al
| Quote: | www.aeroelectric.com
omebuiltHELP [b]
ollow target=_blank>www.aeroelectric.com
/" rel=nofollow target=_blank>www.buildersbooks.com
ofollow target=_blank>www.homebuilthelp.com
llow target=_blank>http://www.matronics.com/contribution
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et=_blank>http://forums.matronics.com
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