To: emc-p...@ieee.org
Subject: RE: PCB temp ratings, etc...
Richard -
Then the answer is no. The MOT, as Pete Perkins pointed out,
establishes the test points for thermal conditioning, but solder resists are
then tested in conjunction with the PWB only for fl
Richard -
Then the answer is no. The MOT, as Pete Perkins pointed out, establishes
the test points for thermal conditioning, but solder resists are then tested
in conjunction with the PWB only for flammability classification.
Regards,
Peter L. Tarver, PE
ptar...@nortelnetworks.com
-Origin
: Peter Tarver; emc-p...@ieee.org
Subject: Re: PCB temp ratings, etc...
Hi Richard & Peter,
Richard, I wonder if you are calling the solder resist coating as
conformal coating?
If so, I expect that the resist coating is ignored for any PWB
ratings
sist coating.
Mike Harris/Teccom
-Original Message-
From: Peter Tarver
To: emc-p...@ieee.org
Date: Wednesday, October 11, 2000 8:31 AM
Subject: RE: PCB temp ratings, etc...
You're welcome, Richard.
MOTs are developed for a copper clad industrial lam
You're welcome, Richard.
MOTs are developed for a copper clad industrial laminate and verified by
certain tests on a finished PWB. Conformal coatings are not a normal part
of this process, though I suppose a board house could ask for such
considerations to be made for a selection of coatings.
Ac
Pete thanks for your reply. I have noticed that the conformal coating on
some boards begins to discolor when subjected to continuous high
temperatures. In some samples, the coating begins to darken, bubble and
delaminate from the surface. Is the conformal coating considered when
setting the rated
PSNet,
PWB's are one form of plastic insulating materials. They must endure for a
long time without giving up the properties that make them good insulators or
enclosures for insulators. In the long term the volatiles evaporate away
and the molecular structure breaks down giving way to fail
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