We deal with power boards and sealing surfaces. The note I've had success
with is:

SUPPLIER SHALL MARK STACKUP AND DATE CODE, SUPPLIER NAME AND/OR TRADEMARK,
AND UL FLAMMABILITY RATING IN NON-CONDUCTIVE INDELIBLE INK (COLOR WHITE OR
BLACK). SUPPLIER SHALL NOT ADD ANY TEXT OR MARKING IN COPPER.

Stephen Golemme
Manufacturing Engineer, Makani
650-214-5647
solveforx.com/makani

On Thu, Nov 30, 2017 at 11:56 AM, Jose A Rios <[log in to unmask]> wrote:

> Silk screen (or etched metal) are acceptable forms of marking.
> Requirements for marking are basically legibility and traceability (you
> basically have to be able to match the conformance coupons to the boards
> they represent), by some method of serialization, which shall include date
> code. UL marking is not an IPC requirement, if required the board user must
> specify it. When using etched metal as marking, it shall not violate min
> spacing to board conductors (same with conductive inks). See 6012D 3.3.5
> and its subsections.
>
>
> José (Joey) Ríos, Sr QA Engineer
> Mission Assurance Manager
> Kavli Institute for Astrophysics & Space Research
> Massachusetts Institute of Technology
> [log in to unmask] <mailto:[log in to unmask]>
> (617)324-6272
>
>
>
> > On Nov 30, 2017, at 2:42 PM, [log in to unmask] wrote:
> >
> > Fellow TechNetters:
> >
> >  IPC-1066 covers Lead free markings/Symbols/:Labels, etc.   Which IPC
> Standard covers bare board vendor logo/UL Rating/markings/production
> date/REV and layer counts.   Is silk screening printing of information
> acceptable beside etch from original external copper foil.
> >
> > Victor,
>