i used the same ratio for pcb shop microsetions -- found the fresh mix
overly reactive and would terrorise the softer materials like electroless
copper -- (in a production environment) found a daily make up, held for
30-60 minutes prior to first use, yielded reasonably consistent results
raising nice grain structure without obliterating fin features....
From:
Chris Mahanna <[log in to unmask]>
To:
<[log in to unmask]>
Date:
16/01/2012 12:49 PM
Subject:
Re: [TN] Copper etchant, 1:1:1
Sent by:
TechNet <[log in to unmask]>
Hi Victor,
Chemist: No
Etchant SME: No
Etched a bazillion PB and PBA microsections: Yes
I suspect your primary variable is the catalyzation. We also find that
the DI water does more harm than good.
We rub the wet cotton swap on copper foil, then re-apply the etchant, then
etch the sample in a 'random' orbital pattern for 3 to 5 seconds. You
will learn quickly the saturation of blue on the cotton ball that produces
a quality microetch.
Keep your copper foil clean, or you'll transfer to the mount.
I know some of our competitors put very small pieces of copper foil
directly in the etchant container.
Using drug store peroxide seems to help the usable life of the etchant,
but it still is only good for maybe 2 hours.
BTW, we JUST added this catalyst step to the new draft IPC microsection
method at Midwest.
Chris
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: 2012/01/16 12:21 PM
To: [log in to unmask]
Subject: [TN] Copper etchant, 1:1:1
Folks,
Is there a real chemist out there or someone very knowledgeable of
etchants?
DI water 10ml
Ammonium Hydroxide 28.0 - 30.0% 10ml
Hydrogen Peroxide 35 10ML
Polish, 6, 3, & 1 micron
Final polish 0.05 Alumina suspension
3 -5 seconds, flush with water
Which of the two chemicals would I increase volume to get stronger
delineation/demarcation region of plated copper. The process being equal
will not yield the same etchant quality. The variable is the quality of
overseas copper suppliers.
Victor,
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0 To
unsubscribe, send a message to [log in to unmask] with following text in the
BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET
Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts:
send e-mail to [log in to unmask]: SET Technet Digest Search the archives of
previous posts at: http://listserv.ipc.org/archives For additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
For additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
