The Bellcore standard for Ionic  contamination prior to soldermask (and on a
completed pcb) is 6.45 micrograms/sq inch

Lisa

--------------------------------------
Date: 11/15/96 12:21 PM
To: LISA GREENLEAF
From: [log in to unmask]
My question to fellow TechNetters is:

What are some typical Ionic Contamination Levels seen at Pre-Soldermask
application and Final levels of bare board before shipping?

Do other end users require monitoring of Pre-Soldermask levels of Ionic
Contamination or just at final?

We are currently going to specify 10 micro grams/sq" does anyone else
specify anything tighter? Is there a cost associated at the boasrd level
to spec something tighter.

Steve Collins
PCB Design Supervisor
TSX Corporation
El Paso, TX
Ph: (800) 351-2345
Fax: (915) 543-4898
email: [log in to unmask]

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