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June 2012

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From:
"Goodyear, Patrick" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Goodyear, Patrick
Date:
Thu, 7 Jun 2012 03:38:31 +0000
Content-Type:
text/plain
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text/plain (126 lines)
HMMM, NOS I can understand mainly with electronic assemblies and not car parts though. 
   
I seem to remember from my High School and College Chemistry and Physics classes that tarnished Silver is a better conductor then the clean silver, considerably.    I remember that being drilled into our heads in Navy ET school as well that one was never to "clean" silver connectors and that was why all Mil-Spec RF connectors were silver plated.   I want to remember that Silver Oxide was right next to bare clean copper in conductivity.   I believe even the lugs connecting to the high voltage buss work were silver plated.   

I know when we make connections at the power plant the electricians use a silver plating powder (Cool-Amp) to coat the connection point, this is especially true with aluminum wiring.   

Cardboard is a great storage medium, it absorbes moisture, just don't want to get it soggy.   

Pat

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Wednesday, June 06, 2012 11:06 AM
To: [log in to unmask]
Subject: Re: [TN] Electronic assemblies packaging

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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