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, >