1. Steel grade verification — spectrometer test
2. Hardness test — HRC check on cavity and core
3. Dimensional inspection — CMM report
4. Surface finish — Ra measurement
5. Cooling water flow test
6. Mold trial report

Red flags: factory can't show material certs, no CMM equipment, no QC process.

Full guide: https://www.mfgabc.com/guides/mold-quality-control-standards.html

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