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11-17-2010, 04:24 AM   #1
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Adverse effect of Silica Gel on Lens?

Is there any adverse effect of keeping lens with silica gel in a dry box. I use one of these with my lenses to keep them safe from fungus (though I don't live in humid place). I was wondering if this will have effect on lubricants inside lens?

Pelican Silica Gel 1500-500-000 B&H Photo Video

Thanks

11-17-2010, 05:51 AM   #2
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If you don't live in a really humid environment, I wouldn't use silica gel at all times. Lenses are designed to be kept on the shelf in normal conditions. Then again, many people seem to do it and I've never heard of any harm done.
11-17-2010, 06:09 AM   #3
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Lenses are also packaged with silica sachets when new so I doubt it would do any harm.

Also I think but don't quote me on this that silica has a much greater affinity for polar molecules of which water is one. The lubricants should be fairly non-polar.
11-17-2010, 06:25 AM   #4
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QuoteOriginally posted by tsangpo Quote
Lenses are also packaged with silica sachets when new so I doubt it would do any harm.

Also I think but don't quote me on this that silica has a much greater affinity for polar molecules of which water is one. The lubricants should be fairly non-polar.
Thanks tsangpo. This sounds convincing.

Other opinions?

11-17-2010, 06:35 AM   #5
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I have kept my line up in dry box with silica gel for a year or so and haven't noticed any adverse effect.
11-17-2010, 07:13 AM   #6
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Toxic ?

Yussuf,
I am eyeing some silica, too, and have focussed on orange-color-balls which change the color once they are saturated.
Then, you can put them in an oven at max. ca. 130°Celsius and wait til they will change color back.
What always strikes me is the amount of poisons you can buy with any product and it's all perfectly legal.
Same here, one of the adds for the silica claimed that it is free of:
Cobalt(II)chlorid
DMF (Dimethylformamid)
Don't ask me what these substances do, but maybe that's something to watch out for.
Good luck,
Georg
11-17-2010, 08:19 AM   #7
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QuoteOriginally posted by axl Quote
I have kept my line up in dry box with silica gel for a year or so and haven't noticed any adverse effect.
Thanks, that's relaxing.
11-17-2010, 09:02 AM   #8
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Hi yusuf, you'll be safe. That stuff is hydroscopic in design(absorbs water)
without 'gassing' or having a reaction chemically. If a packet were to break
open there could be a problem with resulting dust, might be easy with them.
Would not recommend using organic compound such as rice or salt.
Rice,especially, has starches that will gas as it hydrates, it will actually ferment.
If contained,could exceed normal atmospheric pressure and force
starch saturated gas into lens barrel, really fouling things up.(even with WR prefix)
George has good point about toxicity, but last year about this time a local
news show did a thing about kids and appetite's for things like these,
little batteries and stuff like that, and apparently not as toxic as one
might think.As far as kids(or pets) go, if theres even a hint that might happen
hide that stuff away.

11-17-2010, 10:01 AM   #9
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QuoteOriginally posted by yusuf Quote
Thanks, that's relaxing.
Chiming in from a pretty humid country. I just placed a few packets of silica gel in the plastic box I store my equipment. Good to know the silica gel won't harm the lenses.
Posted with gratitude.
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