Also used here for cockpit display/warning panels, leds on one side,
connectors to the driver & input boards on the other side.
Ken
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ian Hanna
Sent: Thursday, September 02, 2010 8:52 AM
To: [log in to unmask]
Subject: Re: [TN] NTC - Re: [TN] Is green solder mask the default by any IPC
standard or is it default by common usage?
this is pretty common for display signs -- matte black mask on the front,
often green on the back circuit-side so that tracking can still be seen by
field technicians...opacity is desirable so that if the rear of the
enclosure is opened, light does not shine through and the sign remains
readable...ian
Guy Ramsey <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
09/02/2010 11:29 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Guy Ramsey <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] NTC - Re: [TN] Is green solder mask the default by any IPC
standard or is it default by common usage?
There is a local OEM of solar powered highway signs. They order black
mask.
The black mask is what we see as we fly by the warning sign. LEDs and
black
mask. All the other parts are on the back side of the board.
Guy
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dennis Fritz
Sent: Thursday, September 02, 2010 10:55 AM
To: [log in to unmask]
Subject: [TN] NTC - Re: [TN] Is green solder mask the default by any IPC
standard or is it default by common usage?
Interesting comments on solder mask color. In the dark ages (early
1980's)
I was product manager for solder mask at MacDermid - dating myself as they
have been out of the mask business for years, now.
Anyway, legend has it that mask was green to blend with the background
color
of laminate. Seems the story was that the first adhesion promoter for
glass
fiber to coat with epoxy resin was based on Chromates. They were green,
giving the laminate a green tint. Of course, for good environemental
reasons the adhesion promoter was changed to silanes, years ago. I heard
green tint was added to laminate so there would be less customer reaction
to
the change. At the same time, there was red laminate, blue laminate and
black laminate. Those made really great etched/plated wall hangings -
Constitutions, Declarations of Independence, ships, dogs, etc. Think more
colored laminate was sold for non-work projects than for actual boards.
Solder mask is similar, but does have some useful colors. A number of
OEMs
use red or blue for static sensitive boards. Of course, there is the
debate
over matte or gloss mask. The most interesting "custom mixed mask" I
remember was black. Not total coverage with black marking ink, a black
mask. Fabricator did not want the customer to see the traces under the
mask
- don't know why, but Solder Mask over Bare Copper - SMOBC was a pads only
version. Beautiful.
Denny Fritz
-----Original Message-----
From: Douglas Pauls <[log in to unmask]>
To: TechNet <[log in to unmask]>
Sent: Thu, Sep 2, 2010 9:18 am
Subject: Re: [TN] Is green solder mask the default by any IPC standard or
is
it default by common usage?
Gregg,
have always liked the old military adage that said you can have any
olor solder mask you want, as long as it is green.
To my knowledge, there is no default color requirement for solder mask in
ny IPC specification, at least one that is current. And as I am vice
hair on the solder mask committee, that is a pretty good estimate.
Doug Pauls
"Temkin, Gregg" <[log in to unmask]>
ent by: TechNet <[log in to unmask]>
9/01/2010 12:35 PM
lease respond to
echNet E-Mail Forum <[log in to unmask]>; Please respond to
Temkin, Gregg" <[log in to unmask]>
o
[log in to unmask]
c
Subject
TN] Is green solder mask the default by any IPC standard or is it default
y common usage?
s green solder mask the default by any IPC standard or is it default by
ommon usage?
In other words, if a drawing does not specify the solder mask color, is
here a color IPC standards default to, or is it uncontrolled?
Thanks,
Gregg
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