Every asset-tag manufacturer publishes an outdoor rating. The number is meaningful only in context: which UV intensity, which substrate, which adhesive, which printing method.
What the test methods actually measure
Most outdoor ratings are derived from accelerated weathering tests (Q-UV or xenon arc) plus salt-fog and humidity cycles. These tests are a useful proxy but not a guarantee. They underestimate combined stresses: UV plus mechanical abrasion plus solvent splash all happening on the same surface.
What '5+ year rating' means for Strongest-tier construction
10-mil plastic with 3M 467 adhesive and a 5-mil textured overlaminate is rated 5+ years outdoors in continuous service across most US climates. Real-world field data confirms it. Strongest-tier tags installed on construction equipment in Florida and Texas have remained legible through five summer seasons without overlaminate failure or adhesive release.
Where ratings fail
Three conditions break published ratings: continuous high temperature above 250°F, sustained submersion in solvents stronger than standard industrial degreaser, and direct flame exposure. For these conditions, specify a metal engraved plate instead of a printed label.