This specification covers end product inspection and test of high frequency (microwave) printed boards for microstrip, stripline, hybrid and multilayer stripline applications. This specification is intended to provide information on the detailed performance criteria of high frequency printed boards. It supersedes IPC-HF-318A and was developed as a revision to that document. The information contained herein is also intended to supplement the generic requirements identified in IPC-6011. When used together, these documents should lead both manufacturer and customer to consistent terms of acceptability.