Maybe a simple question, but how long do silica bags stay good for. If I keep them with my mics to protect from humidity, do I need to change them occasionally or are they good forever...?

3 Answers 3


From http://en.wikipedia.org/wiki/Silica_gel:

Silica gel's high surface area (around 800 m²/g) allows it to absorb water readily, making it useful as a desiccant (drying agent). Once saturated with water, the gel can be regenerated by heating it to 120 °C (250 °F) for two hours. Some types of silica gel will "pop" when exposed to enough water.

  • NB: IMO, an oven is the best way to heat the silica gel to the desired temp. May 14, 2011 at 2:15

I use the Pelican Peli Desiccant Silica Gel containers and they are listed as 'reuseable' so as long as moisture is removed from them I presume they can be reused indefinitely

  • That's what I when I use my 702 in a dry bag from my kayak while hydrophoning, and what I keep in all my Pelican long-term-storage cases. Follow the suggestion in @EMV's post and they can be reused, as per @Tim's answer above, May 11, 2011 at 16:51

If you can get the gel out of the bag, and if they are hard little beads, what you could do to reuse them is put them on a fry pan, without the oil of cause, and heat it up until it changes color. You'll have to put them back into the bag quickly before they start reabsorbing moisture again.

I've generally given up on trying to use them because they are too troublesome to reuse. Lazy me. Ha

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