Paul,
I am not familiar with this spec, but I presume it is similar to the
Battelle flowing gas test, of which there are various flavours (pun
intended).  This test is routinely used to check gas tight connections for
press fit connectors and wire wrap connections, where there is no hint of a
conformal coating.

regards,
Bev Christian
Research in Motion

-----Original Message-----
From: Paul Bannister [mailto:[log in to unmask]]
Sent: May 15, 2001 2:36 PM
To: [log in to unmask]
Subject: [TN] ISA-S71.04 G3 "Environmental Conditions for Process
Measurements"


Does anyone have information about the effects of corrosive gases on printed
circuit board assemblies.  Specifically what I am interested in is what
happens to PCB's when exposed to corrosive levels as described in ISA-S71.04
G3 (Harsh) specification, what is the failure mode?  We are conformally
coating our printed circuit boards now to meet this specification but it is
not clear to me what would happen to the PCB if it were not coated.  Do
people meet this specification without conformal coating?
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