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May 2001

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Subject:
From:
Ken Mc Gowan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 28 May 2001 20:02:08 -0100
Content-Type:
text/plain
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text/plain (185 lines)
Just my $ 0.02. Why not design strip with 'one way' absorbtion barrier. Use
anhydrous copper sulphate which will go blue on contact with moisture/water.
I will not conduct my thing about the origin if colours in transition metals
but it would happen.

Regards,

Ken Mc Gowan
----- Original Message -----
From: "Bev Christian" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, May 28, 2001 12:29 PM
Subject: Re: [TN] Permanent Moisture Sensitivity Indicators?


> Seriously guys, what I am looking for is a PERMANENT change.  I have been
> given a few good leads and after I have checked them out I will share the
> results with TechNetters.
>
> regards,
> Bev
> Research in Motion
>
> -----Original Message-----
> From: Ingemar Hernefjord (EMW)
> [mailto:[log in to unmask]]
> Sent: May 28, 2001 9:11 AM
> To: [log in to unmask]
> Subject: Re: [TN] Permanent Moisture Sensitivity Indicators?
>
>
> Brian
>
> then I propose 'chinese women's hair'. Same mechanism as in a hygrometer,
> but let the shaft through a hole in the unit, put an index or pointer on
the
> shaft, and..behold...you can stay on the ground and check the humidity on
> inside of the units that are 200 meters up in the masts. Yes, the pointer
> must be very big, or you have good binoculars. Don't tell me you see
> problems with the women too.
>
> Ingemar
>
> -----Original Message-----
> From: Brian Ellis [mailto:[log in to unmask]]
> Sent: den 28 maj 2001 11:58
> To: TechNet E-Mail Forum.; Ingemar Hernefjord (EMW)
> Subject: Re: [TN] Permanent Moisture Sensitivity Indicators?
>
>
> 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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