MTC / inspection certificate
Records material identity and specified test results. State the required certificate type, governing standard and whether originals, digital copies or validation are required.
Purchase-order controls
How to Specify MTC, PMI & Third-Party Inspection
“MTC required” or “SGS inspection” is not a complete requirement. Define document type, inspection scope, sampling, acceptance criteria, witness points and release authority before quotation.
Inspection requirements must be tied to the purchase specification and order lines.Different controls
Understand what each item does
PMI
Positive material identification checks alloy chemistry with an agreed method and scope. It does not replace every laboratory test or prove all mechanical properties.
Third-party inspection
An independent inspector witnesses or reviews agreed activities. Name the agency only after defining scope, hold/witness points, report format and who pays.
Traceability
Heat/lot identity must connect material marking, packing list, certificate, test reports and order lines through cutting and repacking.
Timing matters
Place controls before material release
At RFQ
Send the inspection and test plan or list required certificates, sampling, acceptance standards, agency and estimated inspection location.
At purchase order
Freeze revisions, notification period, hold points, retest rules, concession process and document approval route.
Before shipment
Confirm material identity, inspection release note, approved reports, packing marks and any outstanding deviation.
At receipt
Check package integrity, markings, quantities and document-to-material traceability before mixing or machining lots.
PO checklist
Inspection requirement to send with the RFQ
Product / grade / standard / revision: ___
Certificate type and required data: ___
PMI method, coverage and acceptance criteria: ___
Dimensional, visual, NDT or mechanical test scope: ___
Third-party agency and hold/witness/review points: ___
Sampling, retest and nonconformance rules: ___
Marking, traceability, report and release requirements: ___