What is OK to cut?
In general, materials that absorb the deep infra-red beam (10um) that the CO2 laser puts out are most affected.
Organics such as paper, wood, and organic fibers absorb strongly and can be cut and engraved. Leather and wool often give off noxious odors.
- Wood and wood products like plywood, masonite, and similar. Variable results are reported depending on what adhesives are used to make up the wood products.
- Paper, cardboard, etc.
- Fabrics and felt
- Leather, which may require special dance steps like wetting, and may stink
- Glass absorbs, and can be etched easily. Your K40 will most likely engrave but not cut through ordinary glass
- Stones generally absorb and can be etched.
- Plastic or paint coated metals can be marked, but this amounts to burning off the coating under the laser. Anodized and dyed aluminum can be marked fairly easily; this amounts to burning the dye out of the anodized layer.
Plastics can in general be melted or burned by the K40, but the results depend heavily on the exact materials.
- Acrylic (plexiglas, perspex, etc.) cuts easily and nicely
- Some plastics only melt and discolor.
- Plastics and adhesives in composite materials may give off toxic or corrosive gasses.
- ABS to some degree. ABS is reputed to give off hydrogen cyanide (HCN) when lased. Don’t try this until you have a GOOD vent system, and then don’t vent it into your neighbor’s window.
- Marking bare metals needs special coatings to absorb. Cermark is commonly used. Dry moly lube spray has been used as an alternative to Cermark.
What should I stay away from?
Materials that reflect deep infrared are not very affected, and the reflected beam can be dangerous to eyes and skin, as well as damaging the laser lens.
There are certain materials you should not burn in your laser. PVC (polyvinyl chloride) releases hydrochloric acid as it burns. Many other materials involving chlorine in the chemical makeup do too. Some materials release HCN (that’s “hydrogen cyanide”!) gas as they burn.
- Plastics with Chlorine or Florine in them, such as PVC and PTFE (Teflon), can give off poisonous gasses.
- Bare metals generally reflect and can’t be cut with a CO2 laser. Much more expensive YAG lasers are more typically used for industrial metal laser cutting, often with thousands of times more power than a K40.
This material was gathered from the web in the recommendations of either laser manufacturers for use with their CO2 lasers, or from user groups, maker spaces, or university advice/rules/cautions to student users. It is certainly not complete, and may contain errors, but it’s better than asking a fresh new question about “Can I cut/engrave XXX material in the K40?” every time. Please help enlarge and refine this list.
The materials are grouped by classes:
- O = organics
- P = plastics; yes, I know most plastics are technically organic, but for lasers, they’re special
- I = inorganic, or mineral but not metals
- M = metals
|Cork (composite)||o||Y||Y||caution||Adhesives may cause poor results|
|Fabric (natural, not poly)||o||Y||Y||Synthetics are woven plastics.|
|Felt/cloth/cotton/hemp||o||Y||Y||Wool felt stinks|
|Leather||o||Y||Y||Stinks!!||No, really, it stinks horribly. Dyes with chromium can produce toxic fumes|
|Leather/Suede||o||Y||Y||Stinks!!||Note: artificial leather is PVC or PU; beware of chromium-based dyes|
|MDF/Engineered woods||o||Y||Y||caution||Adhesives may cause poor results|
|Mother of Pearl||o||Y||Y|
|Paper, card stock||o||Y||Y|
|Plywood/Composite woods||Y||Y||caution||Adhesives may cause poor results|
|Acrylic/Lucite/Plexiglas/PMMA||p||Y||Y||Good results usually. Can give nice polished edges.|
|Coroplast (‘corrugated plastic’)||p||Y||Y||Flames!||Reputed to catch fire easily.|
|Kapton tape (Polyimide)||p||Y||Y|
|Polycarbonate (Lexan)||P||~||~||Poor results||Melts and discolors, not clean|
|PETG (polyethylene terephthalate glycol)||p||Y||Y|
|Solid Styrene||p||Y||Y||Flames!||Catches fire easily|
|Teflon (PTFE)||p||Y||Y||Toxic fumes|
|Thin Polycarbonate/Lexan Sheeting (<1mm)||p||Y||Y||Works better than thicker|
|PVC (“vinyl”)||P||Y||Y||Toxic||Toxic/corrosive HCl released , eats machines and lungs|
|Polyurethane||P||Y||Y||Toxic||Releases hydrogen cyanide (HCN)|
|Carbon fiber mats/weave||I||N||Y||~||Non-epoxied mat, weave only|
|Ceramic (e.g. decorative tile)||I||Y||N|
|Corian||I||Y||N||Corian is powdered stone in resin|
|Marble, Stone, Soap stone, Granite, Onyx.||I||Y||N|
|Rubber||I||Y||Y||Varies||Some rubbers have chlorine, like vinyl|
|PCB (fiberglass, FR4, etc.)||I||?||~||Varied reports|
|Bare Metals in general||m||N||N|
|Anodized Aluminum||m||~||N||Laser can burn out the dye|
|Painted/coated metals||m||Y||N||Laser can burn away the coating/paint|
Most cities have suppliers of plastic sheet, wood products and paper products. Use the internet and search for what’s local to you, or for a mail order supplier.
Where can I find more information?
Some maker spaces have maintained lists: