Sender: |
|
X-To: |
|
Date: |
Thu, 3 Jun 1999 09:47:29 EDT |
Reply-To: |
|
Subject: |
|
MIME-Version: |
1.0 |
Content-Transfer-Encoding: |
7bit |
Content-Type: |
text/plain; charset="us-ascii" |
From: |
|
Parts/Attachments: |
|
|
Emilio:
At risk of doing your suppliers job for them, typically, oxide thickness is
controlled by weight loss after stripping.
Typical process is to take a coupon which has been run down the oxide line,
and then removed from line BEFORE any anti-pink ring treatment. Coupon is
dried at 120 degrees C for 15 minutes, and weighed to 0.1 mg. Coupon is
then stripped of oxide in 20% HCl (15 seconds?) rinsed quickly, and
thoroughly under running water, and given a final deionized water rinse. Dry
again at 120 degrees C, for 15 minutes, and reweigh.
Calculate weight loss per square cm of exposed Copper.
Typical weights will run 0.5-0.6 mg/square centimeter.
As Michael Carano said, too much weight gives poor bond strength, too little
weight gives a spotty performance in the anti-pink ring treatment, although
better bond strength.
Does this help?
Rudy Sedlak
RD Chemical Company
################################################################
TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################
|
|
|