Direct Part Marking (DPM)
Direct part marking is applying a barcode straight onto a component — dot-peened, laser-etched, or electrochemically engraved — rather than printing a label, with Data Matrix as the dominant symbology.
What You Need to Know
Aerospace, automotive, electronics, and medical-device manufacturers mark parts for lifetime traceability: turbine blades, PCBs, surgical instruments carry a 2D Data Matrix etched into the surface itself. DPM marks survive heat, chemicals, and abrasion that would destroy any label. The square finder pattern of Data Matrix and its solid L-border make it locatable on reflective, curved, textured metal where other symbologies would not be found at all.
DPM is the hardest scanning regime in the industry: contrast may be a few percent (dark-on-dark pits under grazing light), cells are often circular dots rather than squares, and surfaces are curved or shiny. Scanners implement DPM-specific illumination modes and decoding strategies; ISO/IEC 29158 (formerly TR 29158) extends the 15415 grading methodology for these conditions. If you are generating Data Matrix codes for DPM, plan the marking method and reader together.
Where Direct Part Marking (DPM) Applies
A compact 2D matrix code with fixed Reed-Solomon error correction — the standard for pharma serialization and tiny parts.
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