Please note - A600 is NOT A SPEC.  It is an Acceptability GUIDELINE,
basically a collection of photos to show good, bad, in-between.
IPC-6012 is the SPEC.

Patty
Patricia J. Goldman
PPG Industries, Inc.
412-492-5516
[log in to unmask]


-----Original Message-----
From: Timothy Reeves [mailto:[log in to unmask]]
Sent: Thursday, May 25, 2000 3:02 PM
To: [log in to unmask]
Subject: Re: [TN] Searching for IPC "marking" spec


Tom, Franklin:
IPC-A-600E (sec. 2.8.3) did say "no ink on surface mount lands" and
"acceptable on non-surface mount lands as long as it doesn't extend into the
part mounting hole or reduce min. annular ring".
IPC-A-600F is the same for non SM lands but no longer says anything about
ink on SM lands.
IPC-6012A (sec. 3.3.5) does say marking shall not cover areas of lands to be
soldered. That's the most restrictive and probably the spec we should
endeavor to meet.
So, I guess it can be as close as .0000 inches away from a land!
Tim Reeves

> ----------
> From:         Franklin D Asbell
> Sent:         Thursday, May 25, 2000 9:07
> Subject:      Re: Searching for IPC "marking" spec
>
> IPC-A-600 F should have what you're looking for, although I don't
> beleive in that document there is criteria for that
>
>
> Franklin
>
>
>
> "Hybiske, Tom" wrote:
>
> >
> >
> >
> > Was wonder if anyone can point me to the IPC spec which specifically
> > states how close silk screen marking on a printed wiring board can be
> > to land areas?
> >
> > Thanks,
> > Tom Hybiske
> > General Atronics Corporation
> > Wyndmoor, PA
>

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