TECHNET Archives

January 2000

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
"Zajko, Robert A (PA62)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 3 Jan 2000 07:41:47 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (102 lines)
Dave, et al,
After 20 years working in research involving "harsh environments" and the
performance of electronics, in both coated and non coated conditions, there
are two controlling documents that are accepted in the process control
industry where harsh environments exist.

The documents that you would be interested in are:
ISA-S71.04  "Environmental Conditions for Process Measurement and Control
Systems:  Airborne Contaminants"
This is the industry standard for electronic equipment operating in harsh
environments.  It defines the environments in terms of G1, G2 G3 and Gx.

ISA-S71.01 "Environmental Conditions for Process Measurement and Control
Systems:  temperature and Humidity"
This is the industry standard for the acceptable temp and humidity
conditions for electronics.

You will see hundreds of papers written on electronic corrosion.  Like, D.W.
Rice's "Corrosion in the Electronics Industry", CORROSION/85.  However, the
industry standards noted above are the standards.

And finally, there are several test facilities in the US that do
"accelerated" Flowing Mixed Gas Corrosion Testing per IEC/SC 50B/WG6:
Corrosion.  One of which is Battelle Labs in Columbus O.  Bill Abbott, who
has dedicated his life to electronic corrosion, is the country's leading
electronics corrosion expert there.

good luck in 00
BZ



-----Original Message-----
From: David Douthit [mailto:[log in to unmask]]
Sent: Saturday, January 01, 2000 8:51 PM
To: [log in to unmask]
Subject: Re: [TN] Harsh Environments?


Joyce,

Pardo me for jumping in here ( because I started all this I feel
obligated ) but you
brought out a very critical point.

"Environmental exposure classification for electronic packaging are well
defined based on my knowledge (can't remember the document name...it has
been used so much..almost a "grandfather" clause)."

Electronic circuitry, components and materials are changing so rapidly
that these types
of classifications and "grandfather" clauses can and do create
expensive, sometimes
dangerous situations. The basic problem is there does not appear to be
any baseline information, tests, or test equipment using combined
environmental conditions. This
results in very limited testing, disputes about the relevance of the
testing methods,
diverging views of the test results, and confusion over what needs to be
done.

A very poor situation at best. There needs to be a starting
point/testing method used as a
reference to build on. Otherwise the result is ever expanding chaos.

If you have not done so please read my response to Mel Parrish (from
EMPF ) under
this "Harsh Environments?" thread.

Thank you for your time.

D. A. Douthit

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following
text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################

ATOM RSS1 RSS2