This page describes a laser engraving setting published for Polypropylène (PP) at 1 mm, tested on a Monport CO2 100W fitted with a CO2 100W source (10,600 nm CO2, 100 W). It states the exact machine, source, material, thickness and operation of the test; power, speed and number of passes are shown with a Premium pass.
Why those four facts matter: a engraving setting that works on Polypropylène (PP) at 1 mm does not transfer to another thickness, nor to another source. A 10,600 nm CO2 rated 100 W does not deposit the same energy as a stronger module, and the speed has to be adjusted accordingly. Copying a number without checking those four points is the first cause of a ruined part.
Published by LaserSettings (estimation). No other workshop has confirmed it yet: treat it as a starting point, and confirm it from your account if you reproduce it.
No photo comes with this setting yet. If you reproduce it, publish yours from your account: a picture of the result is worth more than a line of numbers.
Recommended routine before running the part: clean the lens, redo the focus, engrave a small test grid on an offcut of the same Polypropylène (PP), then adjust the speed rather than the power. Work with fume extraction and air assist, wear glasses rated for 10,600 nm CO2, and never leave the machine unattended.
Monport offers enclosed CO2 machines (often 40 to 100 W, water-cooled) and fibre markers, priced below the long-established builders. CO2 tubes age: at the same displayed power, a two-year-old machine cuts slower than on day one, which explains many gaps between published settings.
Polypropylene is the safe flexible plastic for laser work: chlorine-free, it cuts with a CO2 leaving a slightly melted, smooth edge. It is the right replacement for PVC in jigs, stencils and packaging.
PP melts before it vaporises: the right setting goes through in one fast pass. Too slow and the material melts either side of the line, the two edges re-welding behind the beam.
Air assist helps a lot here: it clears molten material and keeps the edge clean.
Engraving is unsatisfying: PP barely whitens and melts easily. Keep it for cutting and scoring.
No corrosive gas, but molten-plastic fumes to extract, and a flame risk on thin sheets: supervision needed.
Do not confuse a PP sheet with PVC. The water test settles it: PP floats, PVC sinks.
The melted edge is clean and needs no finishing. PP does not glue or paint easily: plan a mechanical assembly.