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| Date: | Fri, 8 Dec 2006 16:43:46 EST |
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All excellent points, Steve, thanks!
Robert
[sewing tags back onto his pillows]
____________________________________
In a message dated 12/8/2006 4:30:57 P.M. Eastern Standard Time,
[log in to unmask] writes:
Hi Robert!
As an assembler, it just makes a lot of things easier having silkscreen on
the board if there's room. Programming changes, test trouble-shooting,
documenting rework, etc.. We build many boards that don't have room for reference
designators, but I always advocate silkscreen if there's room.
-Steve Gregory-
____________________________________
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Lazzara
Sent: Friday, December 08, 2006 3:22 PM
To: [log in to unmask]
Subject: Re: [TN] Silkscreen Outgassing?
I think the substrate itself is far more hygroscopic than either the mask
or the lettering ink.
Unless the inks aren't fully cured.
But to your point: It's quite possible to have a polymer mask and a UV
letter screen.
Or combinations including epoxy inks.
So out-gassing, if any, would not necessarily have to be the same for the
solder mask as for the silk screen.
But I'm curious: Why letter screen at-all?
- Are these boards being hand assembled?
- Is the lettering functional for repair purposes?
Most of the boards we fab today are so dense you can't even see the
post-assembly board. So unless you're hand-popping parts why risk ink-on-pads --
with or without out-gassing?
Think I'll go tear some tags off of pillows...
ROBERT LAZZARA
VP, Business Development
T: (800) 560-9457
F: (800) 878-5566 (y servicio de mensaje espaņol)
E: [log in to unmask]
W:_ www.CircuitConnectUSA.com_ (http://www.circuitconnectusa.com/)
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