Hmmmm. Prince of Cedar Rapids. Kinda like the sound of that. What's
next, Duke Hillman? Viscount Adams?
But, how to handle the papparatzi? Ahh well, Cedar Rapids only has two of
them and they can be bought off with some good Iowa smoked pork chops.
Doug Pauls
Dennis Fritz <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
02/25/2011 01:20 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Dennis Fritz <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] bare board shelf life
Louis - to quote the eloquent Prince Pauls of Cedar Rapids - "it depends"
You have given us storage temperature - thanks.
We can presume you mean the Pittsburgh area, but you need to confirm
humidity - storeroom, sealed desicant bags, etc.
Next, is there a source of sulfur compounds anywhere close to storage -
heaven forbid boards held by rubber bands. Some finishes are much more
sensitive to "microenvironments" than others.
Finally, can you set up a test program - say every 3 months for a year
running some test coupons with each finish against your flux/solder and
J-003 flux/solder for real data within your environment?
-----Original Message-----
From: Louis Hart <[log in to unmask]>
To: TechNet <[log in to unmask]>
Sent: Fri, Feb 25, 2011 1:50 pm
Subject: [TN] bare board shelf life
TechNetters, it has been some time since the subject of bare board shelf
ppeared on TechNet. As you probably know, IPC published IPC-1601 in August
010, which discusses printed board storage.
IPC-1601 has some comments on HASL finish, referring to a technical paper
which,
presume, was based on data. It mentions 8-9 month degradation of
solderability
n 'thin' areas of coating, with other areas degrading in 1-2 years. If my
eading is correct, 1601 says the degradation 'plateaus' after these times,
ndicating that solderability deteriorates little after these storage
periods.
t does not say anything like 'solderability will be questionable' or 'it
may be
ifficult to form an acceptable solder joint on boards stored for more than
(X)
onths'.
Information on ENIG and Immersion Silver in 1601 is more limited than that
for
ASL.
I am trying to develop a shelf-life policy for this company to use,
thinking
hat some official policy is better than none.
May I have comments on storage and shelf life of boards finished with
HASL,
NIG, and ImAg? If anyone is interested, our storage area does not have
climate
ontrol. I estimate the minimum temperature is at least a little greater
than 10
, maximum temperature is less than 30 C.
Louis Hart
ompunetics
onroeville, PA
SA
[log in to unmask]<mailto:[log in to unmask]>
12-858-1272
______________________________________________________________________
his email has been scanned by the MessageLabs Email Security System.
or more information please contact helpdesk at x2960 or [log in to unmask]
_____________________________________________________________________
---------------------------------------------------
echnet Mail List provided as a service by IPC using LISTSERV 15.0
o unsubscribe, send a message to [log in to unmask] with following text in
he BODY (NOT the subject field): SIGNOFF Technet
o temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
o receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
earch the archives of previous posts at: http://listserv.ipc.org/archives
lease visit IPC web site
http://www.ipc.org/ContentPage.aspx?Pageid=E-mail-Forums
or additional information, or contact Keach Sasamori at [log in to unmask] or
47-615-7100 ext.2815
----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/ContentPage.aspx?Pageid=E-mail-Forums for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/ContentPage.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
