Neither UL markings nor stackup markings are IPC requirements. Again go to 6012D section 3.3.5; its outlined there. Sent from my iPhone On Nov 30, 2017, at 4:11 PM, Stadem, Richard D <[log in to unmask]<mailto:[log in to unmask]>> wrote: It doesn't necessarily have to be. Fabrication drawing notes, and notes on the assembly drawing normally take precedence over industry standards, as they are product-specific. The fab drawing and the assembly drawing are the "Bible" thou shalt go by if there is a conflict. The exception to the order of precedence is generally something in the contract. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]<mailto:[log in to unmask]> Sent: Thursday, November 30, 2017 2:13 PM To: [log in to unmask]<mailto:[log in to unmask]> Subject: Re: [TN] IPC Standard, bare board vendor markings Dell - Internal Use - Confidential Is this statement supported (referenced) in an IPC/Industry Standard? Victor, -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Golemme Sent: Thursday, November 30, 2017 2:07 PM To: [log in to unmask]<mailto:[log in to unmask]> Subject: Re: [TN] IPC Standard, bare board vendor markings 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<http://solveforx.com/makani> On Thu, Nov 30, 2017 at 11:56 AM, Jose A Rios <[log in to unmask]<mailto:[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]> <mailto:[log in to unmask]> (617)324-6272 On Nov 30, 2017, at 2:42 PM, [log in to unmask]<mailto:[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,