TECHNET Archives

July 1998

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:
Phil Culpovich <[log in to unmask]>
Reply To:
Date:
Wed, 8 Jul 1998 06:42:46 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (57 lines)
James, Eddie,

Cupric chloride yields the highest etch factor of all etchants. Using cupric, the etch factor ranges from 2:1
on up to 6.7:1, depending on the type of controller used. The answer to obtaining and easily maintaining a
higher etch factor is to reduce your free acid down to zero and to raise your copper content above 30 oz/gal.
Please contact me off line for complete details at:

[log in to unmask]

Phil

------------------------------

> Date:    Tue, 7 Jul 1998 07:18:57 -0700
> From:    James Patten <[log in to unmask]>
> Subject: etch factor
>
>   REGARDING           [TN] etch factor
>
> What is typical etch factor for 1oz Cu these days? What about 2oz? What =
> is a
> common trace-space that suppliers see these days? Thanks.
>
> ------------------------------
>
> Date:    Tue, 7 Jul 1998 15:42:10 +0100
> From:    Eddie Brunker <[log in to unmask]>
> Subject: Re: etch factor
>
> At 07:18 07/07/98 -0700, you wrote:
> >  REGARDING           [TN] etch factor
> >
> >What is typical etch factor for 1oz Cu these days? What about 2oz? What is a
> >common trace-space that suppliers see these days? Thanks.
> >
>
> May I extend that question from the assembly point of view...
> and ask what overall reduction is seen on pads and traces on 1/2 oz outer layer?
> Due not only to etching but also because of collimation?? tolerance.
>
> Thanks
>
> ------------------------------
>

################################################################
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
################################################################


ATOM RSS1 RSS2