Date: Mon, 17 Dec 2001
00:00:05 -0600
Subject: TechNet Digest - 15 Dec 2001 to 16 Dec 2001
(#2001-781)
There are 3 messages totalling 150 lines in this issue.
Topics of the day:
1. tin compatalbe etchants (2)
2. photoplotters
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Date: Sun, 16 Dec 2001 20:27:06 -0600
Subject: tin compatalbe etchants
What are the known etchants useful for boards made with
electroplated tin
etch resists ? We have been using alkaline sulfate based etchant
which works
very well, even with a 1 um bright tin plating thickness.
Ammonium
persulfate etchant was shown to attack tin.
Also are there any advantages of stripping the tin when no solder
mask will
be used ?
Date: Sun, 16 Dec 2001 22:33:28 -0500
Subject: Re: photoplotters
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have you had a chance to look at the Mivatec (Germany)
?
Their rep in USA is 480 777 7600
-----Original Message-----
Sent: Friday, December 14, 2001 11:58 AM
Subject: Re: [TN] photoplotters
Thanks for the replies.
Anyone have an EIE plotter? Specifically the RP200
line?
-----Original Message-----
Sent: Friday, December 14, 2001 04:28
Subject: Re: photoplotters
Hi Karla,
We currently have a 3-4 year old CSI (guess it's Gretag now)
plotter. We're
happy with the images, speed and up-time.
Regards,
Mark Hargreaves
EMDS
-----Original
Message-----
Sent:
Thursday, December 13, 2001 6:28 PM
Subject: [TN]
photoplotters
I'm in the process of
looking at Photoplotters and would appreciate
any
input any of you may
have. We currently have a 5-6 year old Barco
Crescent
30. I'm looking at
EIE, Orbotech, and Barco/Mania. If any of you
have any
comments on those, or any
others (?) I'd appreciate it.
Karla Thompson
CAM Technician
Electronic Controls
Design, Inc
Tel: (503)
829-9108
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Date: Sun, 16 Dec 2001 23:16:46 EST
Subject: Re: tin compatalbe etchants
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Adam: Please see below...
> What are the known etchants useful for boards made with
electroplated tin
> etch resists ? We have been using alkaline sulfate based
etchant which
works
> very well, even with a 1 um bright tin plating
thickness.
Uh, Adam, you are probably using the best etchant known for Tin, and
getting
away with thinner Tin than anyone using any other etchant. The
only other
etchant suitable for use with Tin is a variant on what you are
currently
using, and it is based on ammonium chloride....and most people in
the world
use this one, and most people using this etchant need 5-6 um of
Tin.
Why do you want to change?
Rudy Sedlak
RD Chemical Company