Ideal humidity level for drybox?


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DanielG

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May 10, 2002
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#1
Hi all,

Just got the Sony A300 last week. Now keeping the set in the free drybox. Just changed the silica gel last night and notice that the Hygrometer on the drybox cover drop from 75% to about 30% this morning. Is this normal or will this be too dry? Read somewhere that the ideal RH should be about 45%-55%. But since this is not the electrical type, how to control?

Any ideals appreciated.
 

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ortega

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Nov 2, 2004
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#2
can but it will take alot of effort

when it gets too dry just open the box a little
then close and monitor again

better to get a electrical one
 

tabako

Senior Member
Nov 25, 2005
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#3
Hi all,

Just got the Sony A300 last week. Now keeping the set in the free drybox. Just changed the silica gel last night and notice that the Hygrometer on the drybox cover drop from 75% to about 30% this morning. Is this normal or will this be too dry? Read somewhere that the ideal RH should be about 45%-55%. But since this is not the electrical type, how to control?

Any ideals appreciated.
Where did u get the replacement silica har?
 

B-setting

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Jul 16, 2004
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#6
yeah, i have heard of people frying the pink silica gel in the wok to get the absorbed moisture out. they said drying it in the sun would not work though. but i have not tried any of that. :confused:
 

DanielG

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May 10, 2002
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#7
Got mine at CP for $5 a bottle of 500g. Probably can get it cheaper else where.

Not sure about frying the silica in a wok though... but I've microwaved them for about 1 min will turn it blue again.
 

Shen siung

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May 21, 2008
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#8
Got mine at CP for $5 a bottle of 500g. Probably can get it cheaper else where.

Not sure about frying the silica in a wok though... but I've microwaved them for about 1 min will turn it blue again.
Any method of heat (to evaporate the water absorbed) will make the silica gel turn blue, however I don't think doing it in wok is a good idea, unless you got no use wok or wok no longer for preparing food...
 

DanielG

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May 10, 2002
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#9
Back to the topic...

So 30% is too low? Then maybe i try to varies the amount of silica gel and see how it goes.... maybe new gel so super thirsty. Or maybe I wait a few days see if the RH will change or not.
 

Octarine

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Jan 3, 2008
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#10
Not sure what is ideal for the dry box .. but the recommended humidity for photographic equipment is between 40 and 50%. More details can be found in the respective manuals :)
 

Octarine

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Jan 3, 2008
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#11
yeah, i have heard of people frying the pink silica gel in the wok to get the absorbed moisture out. they said drying it in the sun would not work though. but i have not tried any of that. :confused:
Nothing I would do. The blue colour of the gel is Cobalt Chloride.
Wikipedia: http://en.wikipedia.org/wiki/Cobalt_chloride
Check the International Chemical Safety Card at the end, do you like to have toxic substances in your kitchen?
 

B-setting

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Jul 16, 2004
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#12
Nothing I would do. The blue colour of the gel is Cobalt Chloride.
Wikipedia: http://en.wikipedia.org/wiki/Cobalt_chloride
Check the International Chemical Safety Card at the end, do you like to have toxic substances in your kitchen?
thnks for the tips on safety. wah! those people who put it in their microwave ovens should also be careful!!! :confused:
 

Yoricko

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May 25, 2008
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#13
My friend told me 40-55% is nice, he usually sets it lower like 30-45% because he uses the box often.
 

ianwurn

New Member
Jul 30, 2008
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#14
Honestly.... getting a small electrical dry cabinet is more economical in the long run. Up front cost is perhaps higher, but there's peace of mind. No need to keep pumping silica gel $$ too.
 

Yoricko

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May 25, 2008
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#16
Honestly.... getting a small electrical dry cabinet is more economical in the long run. Up front cost is perhaps higher, but there's peace of mind. No need to keep pumping silica gel $$ too.
Some Silica Gels can be sun-tanned and re-used.
 

aaxiz

New Member
Jul 15, 2004
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#19
Actually in comparison, even in the long run, you wun spend much more on silicon gel...

Best gauge is to determine whether your dry box is enough for your storage. If its not big enough, then get a Dry Cabinet.

Therefore, determine whether you are going to get more lens / filters or so.

You can also determine whether you have other form of equipment like Video Camera , PNS camera that you can also store in your cabinet. Make full use of it.

Btw, previously I used a dry box. Humidity drop till 20%! Thus you need to adjust the amount slowly. A few days trial and error wont affect your equipment much.
 

ThoNguyen

New Member
Dec 31, 2008
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Boonlay
#20
i disagree with axxiz that silica gel cost more in the long run. i bought a box of 500g and used for already 2 weeks, i used about 1/4 of the box. when i finish using it, put all in a frying pan for like 10mins, it will be blue and there i go, another full box to use. it virtually cost nothing after u bought one box. dry cabinet is always a better choice as you have more $. myself is a student, a dry box 25$ and 4$ of silica gel is good for me :D
 

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