Hi Joyce - we have seen the same yellowing effect but only at Doug's desk. We are pretty sure it has something to do with his Diet Mt. Dew habit. Dave Joyce Koo <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 06/06/2012 11:10 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Joyce Koo <[log in to unmask]> To <[log in to unmask]> cc Subject Re: [TN] Electronic assemblies packaging Paper product has been changed dramatically in last 100 years. I had old 18xx copy of books, still black and white with gold edge. My new text book about state of the art technology, turned yellow very quickly under the sun. Some of them smell funny too. 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 Whittaker, Dewey (EHCOE) Sent: Wednesday, June 06, 2012 11:58 AM 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 T: +44 [0] 1865 522 663 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. ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. 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