We use 1.56 micro grams/ sq. in. This is from J-STD 001 8.3.6 ( IPC Test-TM-650 )
Are you sure you don't mean 20 micro grams/ in sq. This was the old MIL STD req.
Charles Caswell

-----Original Message-----
From: Angela Gregor [mailto:[log in to unmask]]
Sent: Friday, September 05, 2003 4:25 PM
To: [log in to unmask]
Subject: [TN] Ionograph


First I wanted to thank you all for the gasket information you gave.
Evidently this forum is very much respected because I didn't get any
arguments from anyone here. Here's another one. At our company we are
currently using Ionograph 500m version 3.02 to test our assembled boards
after wash. Our pass/fail limit is 20 micro grams of sodium per square
centimeters. I'm not sure our calculation is correct, and I was wondering
what other companies pass/fail limits are for comparisons. I called about
three places in my area and got three different answers. If this helps most
of our boards are double sided. I would appreciate any feed-back. Thanks in
advance.

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