TECHNET Archives

February 1997

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:
Date:
Sun, 9 Feb 1997 12:01:58 -0500 (EST)
Content-Type:
text/plain
Parts/Attachments:
text/plain (55 lines)
In a message dated 97-02-08 01:10:52 EST, you write:

>Has anyone had any problems with developer antifoams harming panels run
>through the Black Hole process?
>
>I've heard some antifoams have a detrimental effect, either on the surface
>itself, or on subsequent plating operations.  Obviously, poor rinsing would
>be one cause of this.
>If anyone has experienced this problem, I'd like to hear about it.   Have
you
>found an antifoam that is safe?  Or, have you eliminated antifoam in you
>developer?  Any information would be greatly appreciated.
>
>

Mark:

Antifoams cover a multitude of sins, as they are variously formulated with
all sorts of insoluble ingredients that can coat panels and cause severe
problems done the line.  The type of antifoam that you are looking for is a
pure polyglycol, that is 100% completely soluble in your rinse water, yet
becomes insoluble in the increased temperature and concentration of your
developer.

Did I mention that a defoamer must be insoluble to defoam, but that
polyglycols become insoluble with increasing temperature and increasing salt
content, and thus can function nicely in a developer, yet rinse completely
cleanly in a cold rinse system?

How can you tell if you have such a defoamer already?  Simple, merely take
your defoamer, and dilute it to 5 or 10% in cold tap water.  I should
dissolve COMPLETELY, leaving no cloudiness or layer of anything.   If not, it
is time to look to another source of defoamer.

Further questions, or for the name of a good vendor of "pure polyglycol" type
defoamers, 
Call or write

Rudy Sedlak
RD Chemical Company
Phone 415-962-8004
fax      415-962-0370

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to:           *
* [log in to unmask] with <subject: unsubscribe> and no text.        *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact   *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      *
***************************************************************************



ATOM RSS1 RSS2