FYI, I am in the midst of such a comparison between real time storage of
four popular finishes , ENIG, HASL, OSP and Palladium stored in two
different environments and tested daily using a wetting balance. The
initial report on this will be presented at SurFin 99 with the data set at
approximately 400 days for the metal finishes and 230 for the Organic. This
is an ongoing study with updates presented at the JStd003 committee
meetings. A statistical comparison will also be made against 85/85
conditioning , 65/92 conditioning, steam age as well as dry bakes in order
to determine if a useable correlation factor exists.

-----Original Message-----
From:   Joy, Stephen C [SMTP:[log in to unmask]]
Sent:   Wednesday, May 05, 1999 12:32 PM
To:     [log in to unmask]
Subject:        Re: [TN] Simulation of PCB ageing

Which is an interesting experimental concept. Why hasn't this been done?

If we can't agree on acceleration factors, why doesn't the industry do a
DOE
with a leg or 2 being actual life and other legs being acceleration tests
to
determine factors for different constructions/components/surface
finishes/.....

Or has this been done?

Steve

-----Original Message-----
From: Matthew Lamkin
[mailto:[log in to unmask]]
Sent: Wednesday, May 05, 1999 7:44 AM
To: [log in to unmask]
Subject: Re: [TN] Simulation of PCB ageing


You could always build a time machine, send them back 11& 3/4 months and
then they'll be ready next week. 8-)

><CUT>
>How to simulate a Pcb ageing equivalent to a one year storage ?
><CUT>
>
>
T.T.F.N

Matthew Lamkin
Printed Circuit Board Draughtsman
Protec Fire Detection PLC
Churchill Way,
Nelson, Lancs
BB9 6RT.
England U.K.
Tel 01282 717393
Fax 01282 717273
Email = [log in to unmask]

Company Web Site = http://www.protec-fire-detection.plc.uk

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following
text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section
for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or
847-509-9700 ext.312
################################################################

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################