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topic 4720

Laser marking of Anodized Aluminum



I am in the process of learning how to mark anodized AL with a low power (12 watt) CO2 laser. The material is in sheet form , .012 .040 thick. I have purchased anodized material from several sheetmetal users, not sheetmetal suppliers. I find great variation of how the material marks between the suppliers. Some material marks well with low power at high writing speed (25 inches per minute), while some material requires max power, slow speed (1 inch per minute), and multiple passes to obtain a descent mark. I have been mostly marking black anodized, but would like to work with other colors also. So far, sample of hard, grey, marks the easiest. Marking is very white.

Can you provide any information on what type of anodizing / substrate yield the best results when laser marking?

Also, once I learn what works best, I will need to find a to supplier for said anodized sheet.

Thank You,


Dan Hammersmark
Hammersmarking - San Bruno, California, USA


Check out Lorin Industries' U.V. stable, anodized Al 5005-H34. It is used for laser etching meter nameplates. We have had good success with this product. However, barcode reading can be problematic with certain types of scanners.

Kirby Nelson
- west union, South Carolina

September 11, 2010

Hello Dan ,

You can black LASER MARK anodized aluminum with a coating material. Such material is available in two colors, Gold & Silver anodized. The laser absorbing coating is applied in the mfg. process of these aluminum sheets. Labels are ready to laser mark with low power CO2 lasers.

This is well established process in the industry.

Jagdip Thaker.

JN Thaker
- Schuamburg, Illinois, USA

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