Best acrylic for laser engraving and cutting
Acrylic (plexiglass / PMMA) is the highest-margin material in most laser shops. Buying the wrong kind wastes sheets and time. Here's what to buy and what to make.
Cast vs extruded
| Cast acrylic | Extruded acrylic | |
|---|---|---|
| Engraving | Frosty white, high contrast ✔ | Faint, greyish |
| Cut edge | Flame-polished, glossy ✔ | Can melt/bead; fine for plain cuts |
| Thickness accuracy | ±10% | Tight ✔ |
| Price | Higher | Lower |
| Buy for | Signs, awards, anything engraved | Cheap cut-only parts, spacers |
What to stock
- Clear cast 3 mm — LED signs (engrave on the back, mirror the design), toppers, stands.
- Clear cast 5–6 mm — awards, thicker edge-lit signs.
- Black and white cast 3 mm — signage, keychains; opaque = diode-friendly.
- Two-tone / laserable acrylic — engrave through the top layer to reveal colour (nameplates, badges).
- Mirror acrylic (gold/silver/rose) — engrave from the back; wedding signs, cake toppers.
- Fluorescent/neon edge-glow — keychains, earrings.
- Pre-cut acrylic blanks (keychains, circles, ornaments) — lets diode owners sell acrylic without cutting it.
Clear cast acrylic 3 mm: Check price on Amazon ↗
Black cast acrylic 3 mm: Check price on Amazon ↗
Two-tone laserable acrylic: Check price on Amazon ↗
Mirror acrylic: Check price on Amazon ↗
Acrylic keychain blanks: Check price on Amazon ↗
LED sign bases: Check price on Amazon ↗
Settings tips
- Engraving: high speed, low–mid power, film off; dial DPI to ~300 for frost without ridges.
- Cutting: film on, low air assist, slow enough to polish; lift sheet off the bed to avoid flash-back.
- Diodes: engrave opaque/two-tone only; clear acrylic passes the beam — why.
- Machine times per thickness: 3 mm · 5 mm · 8 mm.
FAQ
Can you laser engrave acrylic with a diode laser?
Opaque (black, white, colours) and two-tone acrylic: yes. Clear and translucent acrylic: no — the 450 nm beam passes through. Buy pre-cut opaque blanks or use a CO2 for clear.
Is cast or extruded acrylic better for laser?
Cast — it engraves frosty white and cuts with a polished edge. Extruded is cheaper and thickness-accurate but engraves faintly; use it only for cut-only parts.
What thickness of acrylic for LED signs?
3 mm clear cast for most edge-lit signs (the LED base slot is usually 3 mm); 5–6 mm for larger signs or a heavier look.
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