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IPC 4921A PDF
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Requirements for Printed Electronics Base Materials (Substrates)
IPC 4921A – Requirements for Printed Electronics Base Materials (Substrates)
IPC 4921 establishes the classification system, qualification and quality conformance requirements for printed electronics base materials (substrates).
The standard defines the base material only and should not be used for substrates that have been postprocessed and comprise defined features or structures (e.g., conductive traces).