A friend of mine just gave me 2 big bags of this stuff...he got it from big machine his company bought lasttime....

So wanna ask is the silica gel or can it be use like Silica gel ?? I pressed it, all like tiny bean inside

PS : I dun want to cut the bag to see what's inside since it's come with very thick cloth bag...

I also check on the net ...
http://www.engelhard.com/Lang1/xDocID33B50.../up1/SubSiteID0
http://www.engelhard.com/documents/EC-7887...%2025_10.04.pdf

this looks to me like a industrial sized dehumidifying pack!

and look, it's already stated on the bag. "bla bla and static dehumidification approved...."

definately is a de-humidifier, but not necessary silica gel. can be some karbonat as well.

ehhh...my english not so good ler...so can or cannot use ?? its stated need activation or reactivation bla bla... ...

But the weblink said "...also ideal for machine parts, photographic and optical devices, medical equipment and diagnostics, aerospace and military products, film, paper and metal, food packaging, shipment and storage, packaged chemicals, and packaging of any hygroscopic materials."

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Added on April 4, 2007, 10:55 pmif become karbonat meaning becoming dust ??? danger to camera ??

This post has been edited by g88: Apr 4 2007, 10:55 PM

chemical composition 70% silicon oxide/silica gel SiO2, , 20% Alumina, Al2O3.... considered silica gel..... you would need to reheat the before use... oven at 150C will do or... microwave that exites the water molecules, There is usually some colour indicating gel.. be it blue to red.....deep blue to light blue

You would have to remove the silica gel beads from the cloth bag by removing some stitches and heat those beads in a tray... refill the bag and.. stitch back/ put into smaller containers...

Edit.. it appears to be to be clay type desicator with Si02 present... still regeration of the desicating function maybe possible.

This post has been edited by BeastX: Apr 5 2007, 12:39 PM

THanks for the chemical explaination....how long do it need to heat it ?? WHat is over tempreature ?? Will it exploded or something since am planning use office microwave do it.. ...

How do i "clean" the microwave after that ?? Dun want my colleague got poison ler

SiO2 and Al2O3is not poisonous.. it is the trace elements/colour indicators that is poisonous such as cobalt that is often used for colour indicator.. As long as there is no dust particles it should be save... Wipe the interior microwave with wet towel will do..

Silica gel will often crack/break into smaller pieces under microwave but most will remain intact.

As for how long .... the colour indicating gels are a good measuring stick (if present), pinkish to deep blue or light blue to deep blue.. ... or even weighing the end results... Silica Gel may loose up to 20% or more of its initial mass after heating.. I usually mix a little colour indicating gel distributed evenly in non-indicating gel as a guide

For example.. 200g of ordinary silica gel with roughly 3 to 5 mm diameter beads takes probably 7 to 10minutes in a 700w microwave oven to regenrate.

This post has been edited by BeastX: Apr 7 2007, 08:05 AM

read again properly, this bag is activated for 12 hours ONLY!

so, what do you think?

i also got this type of bag in my work, but never bother about it.

Basic chemistry SiO2 water molecule binding is reversible... deactivation... heating the SiO2 to around 120-135C (245-275F),.. reactivation.. period 12 hours would be the ability of SiO2 water molecule binding reaction to reach an equalibrium to keep the moisture content in an enclose space relatively stable (low)..

This post has been edited by BeastX: Apr 8 2007, 12:02 AM

wow...big bag u got there....

I got 2 bags ...friend gave but after read all the sifu comment i think i will send it to dustbin soon

i would put it under the hot sun for an hour or so. with the sun this hot nowadays...
I won't put it in my microwave, unless that oven is no longer doing food stuff.

I would use it in my camera casing. just leave it at the bottom of the case. once a while just take it out to sun it.

good idea also. Let me get my mama do it for me tomorrow

Thanks thanks !!

Do it yourself. Goodness.

unlike drying cloths... unless you concentrate the sun rays... there is no way sunning provide enough energy for the water molecules to discociate from SiO2 molecule..

Microwave on other hand use wave that excite/vibrate molecules (and other high density solids.. as well).. that lets H2O to disassociate with relatively low energy..

This post has been edited by BeastX: Apr 10 2007, 09:25 AM

wow, that size i think u need to go microwave

day time work la...weekend lain cerita.

Anyway i bought real silica gel oredi

Where you bought your silica gel ? price ?

Thanks !

I thought it's a small pack of gun powder

it's look like a sugar..can i make a cup of coffe using this silica?