What you can (and cannot) laser¶
Lasers are selective. A material that looks “plasticky” might cut beautifully — or release chlorine gas. This page is a shop-floor map of common materials, typical results, and hard stops.
Always run a small test on a scrap from the same batch of material. Coatings, adhesives, and dyes change outcomes.
Never laser materials that release chlorine or other highly toxic gases
If a material is PVC, vinyl with PVC, or otherwise chlorine-based, do not cut or engrave it on a typical diode/CO₂ hobby or small-shop laser. Chlorine-containing fumes can seriously harm you and corrode your machine. When in doubt, identify the plastic first — do not guess.
Organics that usually work well¶
| Material | Typical use | Notes |
|---|---|---|
| Hardwood / softwood | Signs, plaques, inlays | Resin and oils vary; watch for pitch flare-ups |
| Plywood / Baltic birch | Cut signs, layered art | Glue lines can char unevenly; exterior glues may be nastier — know your sheet |
| MDF / HDF | Cheap blanks, prototypes | Dusty, strong smell; exhaust is mandatory |
| Paper / cardstock | Invitations, packaging | Fire risk is high — air assist and attention |
| Leather / some vegan leathers | Patches, wallets | Real leather engraves nicely; synthetics vary — some are vinyl (unsafe) |
| Cork | Coasters, boards | Engraves well; cutting thickness limited by power |
| Rubber (laser-safe stamp rubber) | Stamps | Use rubber sold for laser; random rubber may be unsafe |
Plastics — proceed with knowledge¶
| Material | Typical result | Caution |
|---|---|---|
| Cast acrylic (PMMA) | Excellent cut/engrave on CO₂; diodes vary by color | Exhaust acrylic fumes; know cast vs extruded for edge quality |
| Extruded acrylic | Cuts, but edges may differ from cast | Same fume care |
| Delrin / acetal (POM) | Can mark/cut on appropriate lasers | Strong formaldehyde-related concerns — research and vent heavily; many shops avoid it |
| PET / PETG | Sometimes markable | Melting and stringing; test carefully |
| ABS | Often poor / nasty fumes | Many shops avoid lasering ABS |
| Polycarbonate (Lexan, etc.) | Generally a poor laser material | Tends to discolor, absorb poorly, and produce unpleasant results — usually skip |
| Nylon | Unpredictable | Often avoided for cutting |
Polycarbonate
Polycarbonate is a frequent “looks like acrylic” trap. It typically does not laser like acrylic. Prefer known acrylic sheet from a supplier who labels it.
Metals¶
| Situation | What usually happens |
|---|---|
| Bare stainless / aluminum with fiber | Engrave / anneal / deep mark depending on settings and machine |
| Bare metals with CO₂ | Poor absorption; reflection risk — not a normal workflow |
| Anodized aluminum | Diode/CO₂/fiber can remove or alter the anodized layer for high-contrast marks |
| Powder-coated / painted metal | Laser often removes coating to reveal metal underneath |
| “Laser marking spray / paste” on metal | Creates a bonded mark with diode/CO₂ on some metals — follow product instructions and cure times |
Stone, glass, ceramics¶
| Material | Typical result |
|---|---|
| Slate | Excellent high-contrast engrave on many diodes/CO₂ |
| Glass | Surface frost / etch; technique and masking matter; breakage risk |
| Ceramic tile / coated tumblers | Often engrave the coating; substrate varies |
| Marble / granite | Light surface etch possible; depth and contrast vary |
Want this to click faster? Master LightBurn walks the tools and workflows step by step — lifetime access, one clear path.
Dangerous or strongly discouraged materials¶
Treat this list as do not laser unless you have industrial controls and expertise far beyond a typical maker laser:
- PVC / vinyl / faux leather that is PVC-based — chlorine gas / HCl risk
- PVDC and other chlorine plastics
- Unknown “mystery plastic” — identify first (recycling codes help but are not perfect)
- Polycarbonate for cutting workflows — poor results and harsh byproducts
- Fiberglass / carbon fiber composites — hazardous dust and binders
- Pressure-treated lumber — chemical treatments
- Materials with unknown flame retardants or PTFE coatings without documentation
Identify before you burn
If a client sends “just some plastic,” ask for the material name or a sample Safety Data Sheet (SDS). Refusing an unknown blank is professional, not rude.
Adhesives, tapes, and laminates¶
Double-check layers:
- Transfer tape, vinyl application tape, and many wall decals are vinyl → unsafe to laser
- Laser plywood with thick glue lines may char or flare
- Laminated engraving plastics (rowmark-style) are often designed for laser — buy products marketed for laser engraving and follow the manufacturer
Fumes are part of the material choice¶
Even “safe to laser” materials produce smoke and ultrafine particles. Pair every material decision with ventilation and safety. Your lungs and your optics both care.
Related reading¶
- Starter settings — how to find power/speed safely
- Laser types
- Engraving a plaque
Go further¶
Primary next step
Master LightBurn¶
Structured LightBurn training from Bearded Builds — skip the scattered YouTube rabbit holes. Lifetime access with updates.
Also: Shop custom plaques · YouTube · Course hub