Updated: October 2026
Acrylic is the CO2 laser’s superpower – polished, sealed edges straight off the bed. But PMMA punishes lazy settings with flames, taper and cloudy engraving. This guide gives a practical starting chart for 100W-class machines, the cast-versus-extruded truth, and fixes for the six defects that waste sheets. All speed and power values are starting estimates (est.) – every tube drifts, so tune with test squares before production runs.
Acrylic Cutting Settings Chart, 100W Reference (est.)
| Thickness | Speed | Power | Air assist | Focus |
|---|---|---|---|---|
| 2 mm | 25-30 mm per second | 55-65% | low | surface |
| 3 mm | 18-22 mm per second | 60-70% | low | surface |
| 4 mm | 14-18 mm per second | 65-75% | low | surface |
| 5 mm | 10-14 mm per second | 70-80% | low-medium | 1 mm into sheet |
| 6 mm | 8-10 mm per second | 75-85% | low-medium | 2 mm into sheet |
| 8 mm | 5-7 mm per second | 80-90% | medium | 2-3 mm into sheet |
| 10 mm | 3-5 mm per second | 85-95% | medium | 3 mm into sheet |
| 12 mm | 2-3 mm per second | 90-100% | medium | 4 mm into sheet |
Adjustment notes: a healthy 150W tube runs these jobs about 25-30% faster or thicker at the same speeds. Losing power mid-sheet is the classic sign of a warm tube – check chiller temperature before touching speed.
Cast vs Extruded Acrylic
| Property | Cast acrylic | Extruded acrylic |
|---|---|---|
| Cut edge finish | Excellent, clean and glossy | Good, slight striations possible |
| Engraving | Frosty white contrast – ideal for awards | Weak, clearish marks |
| Heat stress and cracking | More resistant | Crazes easily under poor settings |
| Price behaviour (est.) | 15-25% costlier | Cheaper, wider size availability |
| Best use | Trophies, engraved panels, displays | Cut letters, boxes, glazing |
Air Assist, Focus and the Flame-Polished Edge
- Low air, always, on acrylic: strong air cools the melt and dulls the edge; just enough pressure to stop flames licking upwind.
- Focus into the sheet above 5 mm: focusing one-third of the thickness deep keeps the kerf parallel instead of tapered.
- Flame-polished edges are a speed-power game: one decisive pass at full rated speed for the thickness; crawling reheats and frosts the edge.
- Keep the honeycomb clean: residue flashes back marks on the sheet underside; knife beds beat honeycomb for acrylic letters.
Masking and Handling
- Paper masking beats plastic film: it peels without crazing and does not melt into the kerf.
- Never wipe fresh-cut acrylic with thinner; use isopropyl alcohol sparingly – aggressive solvents cause stress cracks within hours.
- Let hot sheets rest flat for 20-30 minutes before de-mask and assembly to avoid warping thin pieces.
Troubleshooting the 6 Common Acrylic Defects
| Defect | Cause | Fix |
|---|---|---|
| Flames during cutting | air too low or none, power too low for speed | raise air slightly, increase speed or power, never leave machine unattended |
| Tapered or wedge edge | focus at surface on thick sheet | focus one-third depth into material |
| Cloudy, unclear engraving | too much power, extruded sheet | lower power, raise speed, use cast acrylic |
| Grid marks on underside | dirty honeycomb reflection | clean bed, raise sheet 3-5 mm on pins, use knife bed |
| Stress cracks after days | solvent exposure, tight mechanical fits | no aggressive solvents, allow 0.2-0.3 mm fit clearance |
| Bottom not cut through | tube ageing, focus drift, dirty lens | clean optics, refocus, check tube current against rating |
Our Verdict
Master this chart on one machine before blaming the next – 90% of acrylic complaints are focus, air or optics, not the tube. Stock cast sheets for engraved awards and extruded for cut letters, keep extraction steady with a real dust collectors, and see the volume economics inside the Rs 1 Cr trophy and marking factory case study and Rs 1 Cr corporate gift plant case study. Browse CO2 laser machines for machines sized to acrylic work, and plan staging with the all-India printing business startup guide.
FAQs – Acrylic Laser Cutting Settings Chart India 2026
What are the best settings to cut 6 mm acrylic with a 100W CO2 laser?
Start at 8-10 mm per second, 75-85% power, low-medium air assist and focus 2 mm into the sheet (est.). Tune one test square: faster for glossy edges, slower only if the bottom misses.
Why does my acrylic keep catching fire?
Flames mean combustible vapours pooling – usually zero or too-weak air assist or a focussing fault that heats a wide kerf. Raise air just until flames die, keep the bed clean and never walk away from a running laser.
Which acrylic is better for engraved trophies – cast or extruded?
Cast acrylic, clearly: it engraves with the frosty white contrast buyers expect on awards. Extruded sheets engrave faint and craze easily under heat.
Can a CO2 laser cut 20 mm acrylic?
Only with 250-300W-class industrial tubes, slow passes and careful focus – and edge quality still falls short of CNC-routed and flame-polished 20 mm work. That thickness is router territory for professional output.
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