PCB (FR-4) - UV Mark Laser Settings - UV 355nm 5W

Specifications and context

Evidence status

Bundled baseline — no community vouch or proof-burn photo attached

Source data reviewed

2026-08-09

Laser source

UV

Model

UV 355nm 5W

Power

70%

Speed

500 mm/s

Frequency

130 kHz

Passes

1

Hatch interval

0.015 mm

Pulse width

1 ns

Production guidance

This PCB (FR-4) - UV Mark other record pairs 70% power with 500 mm/s on UV 355nm 5W, using 1 pass, 130 kHz, 0.015 mm hatch spacing, and 1 ns pulse width. Compare every listed field with the source, lens, focus method, and material finish on your machine before transferring the recipe.

1. 1. Cold UV marking on PCB/FR-4. Minimal heat-affected zone. Source: ComMarker UV guide; omglaser.com (2024).
2. 2. Treat this as an unverified baseline, not a production preset. A VERIFIED Parameters Library record requires three independent community vouches; an attached proof-burn image provides additional evidence.
3. 3. Unlisted substrates vary batch to batch. Treat these numbers as a starting point and step power in small increments rather than jumping to the listed value.
4. 4. UV marks cold, so contrast comes from surface chemistry rather than heat. Focus tolerance is tight; a fraction of a millimetre off will wash the mark out.
5. 5. A 0.015 mm hatch is fine enough that overlap error shows: verify the galvo or gantry is square before running a large field.
6. 6. Record the successful result in the Parameters Library so the next production run is repeatable.

The bundled note for this PCB (FR-4) - UV Mark recipe is: “Cold UV marking on PCB/FR-4. Minimal heat-affected zone. Source: ComMarker UV guide; omglaser.com (2024).” The source data was reviewed 2026-08-09; no independent vouch or proof-burn image is attached. Label the scrap test with the adjusted values and keep the accepted result with the production job.