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How to reactivate silica gel?

Vacuum Sealer discussions

How to reactivate silica gel?

Postby condomain » Thu Sep 13, 2012 8:48 pm

I read that if too hot or too fast heating, the package will melt.

How do you guys reactivate the free silica gel packs we get from buying food in the store?
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Re: How to reactivate silica gel?

Postby conjomen » Thu Sep 13, 2012 11:51 pm

Put it in the oven on the lowest heat you have. Mine is 140 leave it in for 15 minutes and turn the oven off. When the pan is cool take them out and seal immediately. I use them in addition to my o2 absorbers so can't say for sure how well they work The second time around, but I haven't lost any food to spoilage.(hope that helped.)
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Re: How to reactivate silica gel?

Postby Tom Bergstrand » Fri Sep 14, 2012 1:34 am

It is my understanding that there is a brand of Kitty Litter that is ALL silica gel. Not sure of the name but I believe it has "Crystal" in the name.
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Re: How to reactivate silica gel?

Postby Illini Warrior » Fri Sep 14, 2012 3:52 pm

Tom Bergstrand wrote:It is my understanding that there is a brand of Kitty Litter that is ALL silica gel. Not sure of the name but I believe it has "Crystal" in the name.


Fresh Step crystal kitty litter is 100% silica gel .... approx $13 for a 10lb bag at the big box stores ..... make packs from coffee filters


to rejuvinate you need low oven heat for an extended time .... crack open the oven to allow the moisture to escape .... turn the packs over a few times during the drying time period .... time varies per size of desiccant pack ..... I have some large 2 lb packs that take a couple of hours in the oven .... test for complete pack dryness using a zip lock bag .... place the warm desiccant bags into the zip lock .... any accumulated moisture on the bag surface indicates incomplete drying .....
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Re: How to reactivate silica gel?

Postby dale011 » Fri Sep 14, 2012 3:55 pm

Reactivation Instructions - Tyvek Packets

Low heat and a long processing time is required to properly dry out silica in Tyvek.

Do not try to cheat the process by starting with a hot oven or using excessive heat, doing so will destroy the storage medium and/or Silica material.

Products that include reactivation instruction users should follow the exact manufacture recommended instructions.

Important: Check your ovens temperature for proper heating levels.

Ovens must be a vented model to allow moisture released from the Silica to escape during the heating process. The best oven choice is convection or forced air system as it provides the best air flow to aid in drying the packets.

Tyvek has a melting point of 250 degrees Fahrenheit and will melt if you reach or exceed this temperature!

Place packets on a wire rack shelf to improve air-flow, do not pile up packets. When processing more than one rack of packets leave 1”-2” of space between racks, rack should be at lest 1-1/2 feet from the heat source.

The beads have trapped moisture so you need to start the reactivation process with a cold oven, this help prevent seal failure when the water vapor starts to cause the packets to expand as water molecules are released.

Silica can be reactivated at temperatures between 220 - 240 degrees, the ovens Temperature should not increase faster than 0.25 to 0.50 deg F per minute.

The Desiccant will require 12-24 hours of drying time depending on the volume of product being reactivated.

Packets reactivated should be promptly stored in a heat resistant air tight container to prevent moisture from being re-absorbed during the cooling period.

Once packets have cooled you can replace them in your area of humidity control or store these in an air tight container until ready to use.
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Re: How to reactivate silica gel?

Postby bane5150 » Fri Sep 14, 2012 4:02 pm

Try the food dehydrater as not to heat it up to much...
I have several large military size silica packs in the brown bags and they say "Desi Pak MIL-D-3464 type I & II reactivation in bag 16 hours at 245 deg.F"
Made by United Desicants 101 Christine Dr. Belen NM 87002 ( not sure when these packs were made but they work very well in my ammo cans and gun cases)
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Re: How to reactivate silica gel?

Postby condomain » Fri Sep 14, 2012 5:54 pm

Illini Warrior wrote:
Tom Bergstrand wrote:It is my understanding that there is a brand of Kitty Litter that is ALL silica gel. Not sure of the name but I believe it has "Crystal" in the name.


Fresh Step crystal kitty litter is 100% silica gel .... approx $13 for a 10lb bag at the big box stores ..... make packs from coffee filters


to rejuvinate you need low oven heat for an extended time .... crack open the oven to allow the moisture to escape .... turn the packs over a few times during the drying time period .... time varies per size of desiccant pack ..... I have some large 2 lb packs that take a couple of hours in the oven .... test for complete pack dryness using a zip lock bag .... place the warm desiccant bags into the zip lock .... any accumulated moisture on the bag surface indicates incomplete drying .....


Oooo thanks you guys! Great tip for saving money!!!
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Re: How to reactivate silica gel?

Postby condomain » Fri Sep 14, 2012 5:56 pm

Wow 16 hours...
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Re: How to reactivate silica gel?

Postby condomain » Wed Sep 19, 2012 5:52 pm

Interesting pages; see the links on the right-hand side:

http://www.ehow.com/list_6002100_uses-silica-gel.html

PS - i thought it was supposed to be non-toxic? Anyway, swallowing them is not good either way.
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Re: How to reactivate silica gel?

Postby condomain » Wed Sep 19, 2012 5:54 pm

Hey, I am thinking, 212 F (100 C) should be sufficient to dry out the silica right?

I mean, that is the boiling point of water.

No need to get to 300 F?
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Re: How to reactivate silica gel?

Postby condomain » Wed Sep 19, 2012 5:55 pm

This one says 110 F.

So confusing....

http://www.ehow.com/how_5938239_activat ... a-gel.html
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Re: How to reactivate silica gel?

Postby condomain » Wed Sep 19, 2012 5:57 pm

And the same website says 275 F

LOL

http://www.ehow.com/how_5833149_dry-silica-gel.html
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Re: How to reactivate silica gel?

Postby condomain » Wed Sep 19, 2012 6:00 pm

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Re: How to reactivate silica gel?

Postby bane5150 » Thu Sep 20, 2012 2:44 pm

Just use common sense...all yout trying to do is dehydrate the gel...Im not sure if the higher temp brings it back to a pre used condition and keeps the particals from sticking together or what. I just use the instructions that come on the bags.
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Re: How to reactivate silica gel?

Postby condomain » Thu Sep 20, 2012 6:37 pm

Actually I am trying to re-use the silica bags that come in food, and so I don't have instructions.

I did order some "real" silica gel packs but they have not yet arrived.
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