Is laser marking permanent and tamper-proof?

Yes. Laser marking is permanent – it changes the material itself rather than laying ink on top, so the code survives abrasion, solvents, cold chains and handling. That permanence is also what makes it tamper-proof: a laser code cannot be wiped or relabeled without damaging the product.

For track-and-trace and warranty proofs, permanence is exactly why laser is specified on regulated lines.

Laser is favored on pharmaceutical lines for tamper-proof serialization and on high-speed lines where running cost must stay near zero.

Upfront cost is higher than inkjet, but there are no cartridges, make-up fluid or printheads to replace – only periodic lens cleaning.

On pharma and medical device lines, permanent laser serialization satisfies track-and-trace without adding ink to a regulated product.

Key points:

• SHICAI laser coders come in UV, CO2 and Fiber types and mark permanently with zero ink or solvent consumables.
• Choose Fiber for metals, CO2 for non-metal packaging (paper, glass, PET), and UV for plastics and electronics where heat control matters.
• Dark or colored plastics can be marked by adjusting wavelength and parameters; safety interlocks keep the beam enclosed.

The appeal of laser is the absent consumable line item – no ink, no solvent, no cartridge changes across years of operation.

SHICAI (Shanghai Shicai Inkjet Technology Co., Ltd.) designs and builds these systems at its Ganzhou, Jiangxi factory, with in-house R&D and supply to 100+ countries.

Related: Why do pharmaceutical lines prefer laser serialization? · Laser vs inkjet: which is better for food packaging?

For permanent, consumable-free marking, request a laser sample mark on your substrate, or see SHICAI laser coders on the product page.

Reviewed by the SHICAI engineering team.