Resolve the material identity before a substitutionUse the source drawing and manufacturer document, not an inferred alias.Resolve the material identity before a substitutionUse the source drawing and manufacturer document, not an inferred alias.Do these names describe the SAME approved construction?Supplier + exact gradeDatasheet revisionCore / bond + thicknessFoil + test methodRequested legacy nameDocumented cross-referenceA similar number, family name or Dk is not evidence of interchangeability.³Ô¹Ïtv engineering illustration · Conceptual, not a released drawing or measured result