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 99% of our products don't need anything tighter. But we do have a design
 that reads a small current from an ion-chamber that won't work if the fab
 and assembly just meets spec. Most of the year is no problem, but in
 hot weather water gets under the mask and we see many failures.

 I think we need a higher class that can be spec'das a (standard) option
 where the need is real.

 Larry Sternig
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 *** Original Author: ipc.ipc.org!ipc.org!          03/07/96  103017

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 From: Keith Lumley <[log in to unmask]>
 Subject: SIR and SEC

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 I am interested in finding out if many of the board shops, or OEM's
 subscribed to Technet are seeing an requirement for SEC and SIR
 significantly tighter than the current Bellcore requirement. ie

                 SEC.......1 micro gramme per sq. cm. NaCl equivelant

                 SIR.......3000 megohms after HASL

 I have seen requests almost an order of magnitude tighter for both
 parameters and am wondering if this in response to an industry trend or just
 isolated cases. I am interested in finding out where our industry is
 heading, in this regard, and if any of the subscribers could suggest why a
 customer may need such tight controls.

                                                 Keith Lumley, RexCan Circuits