Probably, it certainly is a short range force as it only works near
transmitters.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (EHCOE)
Sent: Wednesday, June 06, 2012 4:58 PM
To: [log in to unmask]
Subject: Re: [TN] Electronic assemblies packaging
Of course the solder joints on your radio are still shiny due to all the
string theory buffs.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Wednesday, June 06, 2012 8:48 AM
To: [log in to unmask]
Subject: Re: [TN] Electronic assemblies packaging
Dampness will improve the static dissipation properties of the card, for
other properties I offer a personal observation rather than rigorous data:
I own an old car (~50 years) and am always on the look out for what is known
as N.O.S. parts. Especially electrical parts like switches, dials/gauges
etc. For non classic car fans, "NOS" means new old stock. In other words the
parts are also 50 or more years old, but have not been used so are in
original packing - cardboard. [This is not for sentimentality but because
the original old stock is better made than modern reproductions and does
things like work and fit.] Terminations on this old stuff are nearly always
perfectly clean and shiny, although the boxes are usually a little sad.
Soldered joints are bright, but what would constitute tracking (very thing
copper pieces in some gauges) is usually dull.
50 years is about 40 more than the planned storage time and predates nearly
all auto electronics, so can't comment on that. [Although I do have a rather
modern late 1960s early 70s radio complete with push button tuning - string
operated of course!]
Regards
Mike
Bonding Services & Products
M: +44 [0] 7810 526 317
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E: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Wednesday, June 06, 2012 3:23 PM
To: [log in to unmask]
Subject: Re: [TN] Electronic assemblies packaging
Maybe I missed something, but that article didn't seem too enlightening.
Isn't it common knowledge that bare copper will tarnish?
and that silver coatings need to be protected with "silver saver" paper or
some type of good packaging until used?
(a "no brainer" study, if you ask me...)
It might not be wise to store "piles of reels" in cardboard boxes for nearly
a decade,
but the component termination plating on those probably aren't copper or
silver.
I thought the original question was about shipping final product, not about
wettability.
What is the danger of shipping AFTER SOLDERING in cardboard?
Maybe not the cardboard,
probably the moisture.
Jack
.
On Tue, 5 Jun 2012 20:33:27 -0400, Robert Kondner
<[log in to unmask]> wrote:
>Hi,
>
> Having used card board shelving supplies for years I was curious. I heard
>about solderability issues but never noticed issues. So I was wondering if
>this was hogwash or not.
>
> So I did a little web look up and found this note:
>
>www.kondner.com/files/cardboard_soldering.pdf
>
>Now I have parts in plastic bags and the cardboard containers do have small
>holes, that might help vent. Our temperature is lower probably around 20 -
>23C. But the result in the paper were a BIG surprise. Likes like it is a
>real issue and NOT hogwash.
>
> I have a pile of 1206 reels that have been sitting in a card board box
>without plastic bags for maybe 10 years. I will need to take a look.
>
>Bob K.
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