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IPC-7093A, "Qualification and Performance of Printed Board Assembly (PBA) Conformal Coating Materials and Processes," is an industry standard from IPC that defines requirements, test methods, and qualification procedures for conformal coating materials and the processes used to apply them to printed board assemblies.
The IPC-7093A standard is a copyrighted document published by IPC. It can be purchased and downloaded as a PDF for immediate use. ipc-7093a pdf
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: Expanded guidance on known defects and issues to avoid during the BTC assembly process. Why It Matters ipc-7093a pdf