Last Updated: 2026-09-02
A code that scratches off in handling was never really there. Scratch marking is the failure of a printed or engraved mark under abrasion, when the marking method, the surface, or the handling is mismatched. The fix is rarely more ink; it is matching the mark to the wear the part will actually see.
The Short Answer
Scratch marking is the failure of a surface-applied mark under abrasion: a printed code or label rubs, flakes, or scratches away in handling, transit, or cleaning, while a mark bonded into the material survives. Six causes cover most cases: a surface mark asked to do a structural job, no cure or set window before handling, the wrong marking depth for the wear level, abrasion against fixtures and packaging, aggressive cleaning chemicals, and marks applied over dust or release agents.
| Cause | Fix |
|---|---|
| Surface mark asked to survive years | Switch to laser, a structural mark |
| Handled before the mark sets | Add a cure window before packing |
| Cleaning chemicals strip the code | Verify readability after your wash cycle |
| Mark applied over dust or residues | Clean and prep the surface first |
The pattern behind every row is the same: match the marking method to the wear the part will actually see, instead of printing harder and hoping.
What to Know in Practice
Test marks the way they will live: apply the code, then run the part through your normal handling, cleaning, and storage before judging the result. A code that looks perfect at the machine and fails a week later was never a match for the job.
For parts that face solvents, abrasion, or outdoor service, laser marking removes the question entirely, because the mark sits in the material rather than on it.
About SHICAI
SHICAI runs a full laser line: fiber, CO₂, and UV systems for continuous production. The company ships to overseas production lines and warehouses, and specifies genuine rated laser sources so the machine runs to its rated life. Service and spares are arranged for export markets, and the technical team answers questions directly rather than through a reseller chain.
Related Questions
- Why do printed codes scratch off plastic?
- Most surface marks never bonded; many plastics have low surface energy or carry release residues. A chemistry change or surface prep fixes it, and a sample test proves it.
- Is a laser mark scratch-proof?
- On metal the mark is structural, so abrasion removes material before it removes the code. On some plastics it is a surface color change that resists normal handling well.
- How do I test mark durability?
- Mark sample parts, then subject them to your real handling, cleaning, and transit, and check readability at the end. Suppliers, including our team, run these tests free of charge.
Learn more about laser engraving technology and ISO 9001 quality management.
Next Steps
- Read related FAQ guides on coding and marking basics.
- Get a free sample mark on your material. No commitment, reply within 24 hours.
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