Hello together!

Graham,

I have a little confunsion with the units of the ionic contamination... are
they "mg/cm2" or "microgram/cm2"?

It would be a good thing to be able in Outlook to include greek letters!

Best regards

--
José Antonio García Ontalba

Quality department
NAGARES, S.A.
Ctra. Madrid-Valencia, Km. 196
16200 Motilla del Palancar (Spain)
Tel:  00 34 969 18 00 21
Fax:  00 34 969 33 11 31
E-mail: [log in to unmask]
--


-----Mensaje original-----
De: TechNet [mailto:[log in to unmask]]En nombre de Douglas O. Pauls
Enviado el: martes, 31 de agosto de 2004 22:21
Para: [log in to unmask]
Asunto: Re: [TN] Ionic contamination of PCA


Graham,
The hanging one is a piece of "rope", which, by the way is 8.4 meters long.
String is entirely different.

I would be curious as to the studies which set the 0.2 microgram / cm2
level.  Use of a more modern dart board, no doubt.
Doug Pauls




                      Graham Naisbitt
                      <Graham.Naisbitt@con        To:       IPC TechNet
<[log in to unmask]>, Doug Pauls <[log in to unmask]>
                      coat.co.uk>                 cc:
                                                  Subject:  Re: [TN] Ionic
contamination of PCA
                      08/31/2004 08:48 AM






Doug

If that is the piece of string you were keeping to hang someone with, its
too short!

Irving,

Most of our customers presently employ a go/no-go at something less than
0.2microgrammes of NaCl equivalence per cm2. The old 1.5 limit may be too
high for many modern circuit designs. Remember, that old spec should be
interpreted as: It is acceptable to leave UP TO 1.5mg/cm2 on your assembly
surface, and that cant be a good thing.

--
Regards Graham Naisbitt

[log in to unmask]

Concoat Limited - Engineering Reliability in Electronics
A British Manufacturer

www.conformalcoating.com      www.concoat.co.uk     www.concoatsystems.com

Golf Quote of the week: I may be the only golfer never to have broken a
single putter...if you don¹t count the one I twisted into a loop and threw
into a bush.



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