KB-6160 FR-4: inquiry handoffKB-6160 FR-4: inquiry handoffMaterial identityExact callout, form and source revisionConstruction138°C DSC typical; legacy URL text is not thespecification.Evidence boundaryAnnular geometry is not finished-board acceptance.Commercial scopeQuantity, fixed requirements and permittedalternativesDownload stays on your device. Attach it manually; direct inquiry is always available.