www.securitymagazine.com/articles/79339-sturdy-key-labeling-available-1
Sturdy Key Labeling Available
May 1, 2009

Mechanical keys on a ring can be exposed to a great deal of physical abrasion. Polyester adhesive backed barcode labels simply will not last against constant wear. But a key labeled with an adhesive PermaLabel tag will last. The label has a laser marked sub surface under an aluminum oxide layer, which makes it abrasion resistant. Lifting of the label edge proves difficult due to the hardened aluminum construction.