Rey,
There is no "industry standard for moisture content", to my knowledge.
There is a test, IPC-TM-650 2.6.2.1, for moisture absorption for rigid
laminates. Each "laminate" has a different maximum requirement based on
its' resin and reinforcement system (the % uptake by weight is different
for polyimide than it is for epoxy); and the test is based on a 2" square
of a relatively thick material. Also, there is no requirement for prepreg
(although there is a requirement for maximum volatile content). Anyway,
what the interested party needs to do is compare numbers from each
suppliers specification sheets, which while they cannot predict
performance in certain environments, they are relative comparisons of
propensity to absorb moisture. Then, if the product in use will be exposed
to particularly humid conditions, "bias" the choice of laminates to a low
moisture uptake material. (and those numbers can be different from
manufacturer to manufacturer for "generic" material families).
You need more information on what problem they are trying to solve or
trying to avoid (unless they are just sniffing around for specs, which is
not usually the case).
Valerie
"Stolar, Paul W" <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
04/14/2004 09:28 AM
Please respond to "TechNet E-Mail Forum."; Please respond to "Stolar, Paul
W"
To: [log in to unmask]
cc:
Subject: Re: [TN] PCB moisture content
We had a serious problem with moisture in our boards. But we use
polyimide with high temp solders.
You will have to evaluate for your own application.
Paul Stolar
Materials/Reliability Engineer
Manufacturing Reliability Lead Engineer
Baker Atlas
713-625-5376
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: Wednesday, April 14, 2004 6:56 AM
To: [log in to unmask]
Subject: Re: [TN] PCB moisture content
Not to my knowledge. There is J-STD-020 and a brief section in HDBK-001.
But
neither set a standard for moisture content.
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Rey Degollado
> Sent: Wednesday, April 14, 2004 7:25 AM
> To: [log in to unmask]
> Subject: [TN] PCB moisture content
>
> Hey Guys,
>
> One of our customers is asking on what is the industry
> standard for pcb moisture content and the method of checking.
> Can somebody please help? Should there be standard reference
> (book, etc) you can recommend.. Better.
>
> Thanks.
>
> Rey Degollado
>
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