Inspection Marking after Conformal Coating????

Paint pen.

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Q1. What kind of labels/ink/sharpe can be used under conformal coating without disolving etc...? A1. While we're not familiar with the conformal coat you have selected, this might help.

Label selection: The following chemically durable materials are recommended. ("In-plant" printed labels can be conveniently printed on the production floor. "Pre-printed" labels are purchased with incremented serial numbers.) Recommended material for: * In-plant printing when the label is applied before soldering are polyimide facestock or high temperature polyimide alternative with matching thermal transfer ribbon. * Pre-printed labels applied before soldering is polyimide facestock with polyimide over-laminate. * Labels applied after soldering is polyester facestock or tamper evident facestock with matching thermal transfer ribbon. Printed circuit board label material selection should be done carefully so thermal, chemical and optical scanning requirements are matched to the specific application needs. That way, intended automation objectives can be realistically met. [Meeting Tough Requirements for Printed Circuit Boards, P Henkel, Founder, Electronic Imaging Materials, Keene, NH]

Q2. The board requires a final test after conformal coating. How can I label or mark the assembly as passing final test if the board is coated? A2. It could be as simple as a 'sharpie' or an inked qc stamp

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1. You can use this Brady label (p/n THT-21-426) with a laser printer.

2. You can use the Industrial Sharpie, or the label above.

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We use paper labels with a protective coating to prevent browning during reflow. We've had no problems coating over these labels with our silicone. If your coating is not silicone, a Sharpie should print on the coating.

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