Ingemar

Silica gel is a modified, expanded, form of silica and is inert. Colour
indicated silica gel is not inert: it is laced with a beautifully ionic
salt which is not going to improve a PC Assembly. It is cobalt chloride
which is blue in its anhydrous form and turns progressively redder in
its dihydrate and hexahydrate forms. All forms are water-soluble and
hygroscopic. I'd be **extremely** cautious about placing anything like
that close to an assembly or any component thereof.

Brian

"Ingemar Hernefjord (EMW)" wrote:
>
> Just indicate and not quantify? Why not use the kind of crystals that are put into all delicate transports, changes to nice azur blue if it has been exposed to wet. At least we use them as simple indicators, costs nothing, you can put in one single crystal or several pounds. Reversible too. Don't know the chemical composition, used everywhere on this planet. Modified Silica maybe.Donno.
> Ingemar
>
> -----Original Message-----
> From: Bev Christian [mailto:[log in to unmask]]
> Sent: den 24 maj 2001 00:29
> To: [log in to unmask]
> Subject: [TN] Permanent Moisture Sensitivity Indicators?
>
> TechNetters,
> Hann asked this same sort of question May 9th and I am not aware of any
> answers being posted.  Certainly not with the same title (searched
> archives).
>
> Ever have clients dunk your hard work in water and then claim that you
> couldn't make good product?  Do any of you know of any really small,
> moisture indicator strips that permanently changed color when they are
> dunked in liquid water, as opposed to just being exposed to high humidity
> for long periods of time?  I know, I know a tall order.  Any help would be
> appreciated.  Thanks.
>
> Bev Christian
> Research in Motion
>
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