IPC 4921A PDF
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).
IPC 4921A:2017 History
IPC 4921A:2017
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IPC 4921:2012
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