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Ask the Experts

June 18, 2025 - Updated
July 14, 2016 - Originally Posted

Is Solder Mask Considered an Insulator

If solder from a PTH lead, on the source side, touches solder mask that is over a copper ground plane, but not electrically shorted: is this a defect per IPC standards due to violation of minimum electrical clearance?

Or is solder mask considered an insulating material and not a defect if proven the solder mask has dielectric withstanding voltage > 500volts.

Is solder mask considered a durable insulator over time in harsh environments?

E.C.

Expert Panel Responses

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