A single yes/no compliance certificate tells you a part passed one rule on one day. It tells you nothing about which substances are actually in the part, at what concentration, or how that part behaves the moment a new SVHC lists or a PFAS rule expands. That gap is where audit findings, re-collection cycles, and penalty exposure come from. A Full Material Declaration closes it by disclosing the complete substance composition of a part down to the CAS-number level, so one dataset can be screened against REACH, RoHS, PFAS, and Proposition 65 at once instead of re-contacting suppliers for every regulation. The hard part was never the definition. It is collecting complete, correctly formatted declarations from hundreds or thousands of suppliers without endless manual follow-up, partial data, and confidentiality stalls. This guide breaks down what a usable FMD must contain, how it differs from a certificate of compliance, how FMD relates to IPC-1752A, IEC 62474, and IMDS
