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
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(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,