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.






-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Bavaro
Sent: Tuesday, June 05, 2012 7:30 PM
To: [log in to unmask]
Subject: Re: [TN] Electronic assemblies packaging

No one mentioned the other item I had always heard of....sulfur and
phosphorus contamination in cardboard..it might have been from the days of
China Lake and Jim Raby telling us not to degrade our solderability by using
cardboard....but it has been a long time so my memory might not be all
there.

If your assemblies are not going to have to be soldered anymore, it might
not be important.

FOD would be the only other concern that comes to mind.



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Tuesday, June 05, 2012 1:54 PM
To: [log in to unmask]
Subject: Re: [TN] Electronic assemblies packaging

It depends.  You can get 100% RH in Asia for few days, sufficient to get
cardboard to grow some fungus.  How temporary is your definition at what
condition?  Storage for 6month is definitely not temporary under 100% RH.
(raining season some places is 3 month).  

Joyce Koo
Materials Researcher - Materials Interconnect Lab Research In Motion Limited
Office: (519) 888-7465 79945
Mobile: (226) 220-4760

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of JF
Sent: Tuesday, June 05, 2012 4:24 PM
To: [log in to unmask]
Subject: Re: [TN] Electronic assemblies packaging

I missed those kind of replies Dewey!

OK... say we cut corners, what are the effects on sulfur? Our assemblies are
enclosed but, some may have an opening. "Normally" the packaging should be
temporary. But then again sometimes there's nothing more permanent that
something that is temporary. In which case, what is the "shelf life"? How
long before the sulfuring begins?

On 6/5/2012 4:14 PM, mike buetow wrote:
> You such a card, Dewey. You should be dealt with.
>
> Ugh. I'm board with this already.
>
> --- On Tue, 6/5/12, Whittaker, Dewey
(EHCOE)<[log in to unmask]>  wrote:
>
> From: Whittaker, Dewey (EHCOE)<[log in to unmask]>
> Subject: Re: [TN] Electronic assemblies packaging
> To: [log in to unmask]
> Date: Tuesday, June 5, 2012, 4:07 PM
>
> Don't cut corners on the packaging procedures and you won't sulfur the
consequences.
> Dewey
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of JF
> Sent: Tuesday, June 05, 2012 12:48 PM
> To: [log in to unmask]
> Subject: [TN] Electronic assemblies packaging
>
> Hi all,
>
> Back on Technet after a much needed change of life.
>
> I remember reading, somewhere, that it is not advised to ship 
> electronic assemblies in regular cardboard. We are talking electronic 
> boards in an enclosure, not an unprotected PCB.
>
> Can anyone give me precisions on this matter?
>
> Thanks!
>
> JF
>
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