Laser cutting and engraving leather: real leather, faux leather and safe starting values
are explained briefly when you hover over or tap them.
Leather can be engraved with almost any laser and, in thin thicknesses, cut as well. The engraving is dark, sharp and tactile, ideal for pendants, patches and wallets. What matters, though, is which leather you have. With some leathers and many faux leathers, toxic gases are produced.
Real leather: the tanning counts
Raw hide is made durable by tanning. Two processes matter for the laser.
| Vegetable-tanned | Chrome-tanned | |
|---|---|---|
| Tanning agent | Plant tannins from bark, wood, leaves | Chromium salts |
| Engraving | dark brown, high contrast | often grey and pale |
| Smoke | Laser smoke like wood, extraction needed | Chromium compounds in the smoke |
| Suitability | very good, standard for laser engraving | not recommended |
Vegetable-tanned leather is the material of choice. It is firm, takes engravings with rich contrast and can also be dyed and embossed afterwards. Specialist dealers often call it undyed leather, saddlery leather or “vegetable tanned”.
Chrome-tanned leather is in most clothing, bags and upholstered furniture. Trotec explicitly lists “leather and faux leather with chromium(VI)” among its unsuitable materials. Besides the health questions, the residues settle on the lens and mirrors, and the engraving usually looks disappointing. Leave it out.
How do you recognise the tanning? The safest way is the dealer’s information. One clue is the cut edge: vegetable-tanned leather is usually an even brown at the edge, while chrome-tanned is often light grey to bluish. If you are not sure, do not laser it.
Faux leather: PU yes, PVC never
Faux leather is plastic on a backing fabric. Which plastic it is is the decisive point.
- PU (polyurethane): can be lasered if it is definitely PVC-free. More smoke is produced than with real leather, and the edges melt easily. Good extraction is a must.
- PVC (polyvinyl chloride): absolutely off limits. Lasering produces hydrochloric acid gas (hydrogen chloride). It attacks your airways and corrodes metal parts, guides and electronics in the laser.
The problem: many products are simply called “faux leather”, “leather imitation” or “vegan leather” without naming the plastic. Only buy material that clearly states “PU” and “PVC-free”, or ask the dealer for the data sheet. Even faux leather with a PU surface can have a backing or adhesive containing PVC. When in doubt: do not laser it. Further critical materials are listed in Materials to avoid.
Engraving and cutting
Leather is more sensitive than wood. Too much energy chars the surface, makes the leather shrink and hardens the edges.
- Engraving: Low power and high speed are enough. An engraving that only darkens the surface usually looks better than a deep one. For fine detail, a line spacing of 0.1 mm is enough.
- Cutting: Thin leather up to about 2 mm can be handled by diode lasers too, often in several passes. Thicker saddlery leather is a job for CO₂ or stays with the knife.
- Covering: Transfer film or masking tape on the surface catches smoke and keeps the area beside the engraving clean. Test beforehand whether the adhesive leaves residue.
- Fix it flat: Leather curls. With magnets or pins on the honeycomb bed, the focus stays the same everywhere.
- Air assist: Low to medium airflow prevents flames when cutting without blowing the leather up.
Odour
Lasered leather smells strongly of burnt horn or hair. The smell hangs in the workshop and stays on the workpiece. Extraction that leads straight outside is therefore not a question of comfort. In a flat without an exhaust you should not laser leather. Which solutions exist is explained in Laser extraction.
For the workpiece, it helps to wipe the engraving with a slightly damp cloth after lasering and let the piece air out in the open for one to two days. Leather care applied after airing refreshes the surface and covers residual odour.
Starting values
The ranges apply to vegetable-tanned leather of about 2 mm thickness. They are a rough guide for your first test grid. Leather varies widely depending on tanning, fat content and dyeing, even between two hides from the same dealer.
| Task | 10 W diode | 20 W diode | 40 W diode | 40 to 55 W CO₂ |
|---|---|---|---|---|
| Engraving | 15 to 30 %, 150 to 300 mm/s | 15 to 30 %, 250 to 400 mm/s | 10 to 25 %, 300 to 500 mm/s | 10 to 25 %, 300 to 500 mm/s |
| Cut 2 mm | 100 %, 3 to 6 mm/s, 2 to 3 passes | 100 %, 5 to 10 mm/s, 1 to 2 passes | 80 to 100 %, 10 to 20 mm/s, 1 pass | 40 to 60 %, 15 to 25 mm/s, 1 pass |
PU faux leather usually needs less power than real leather and melts with too much energy. Start at the lower end of the range there. How to build a grid of power and speed is covered in Material test.
Safety
Leather burns, especially thin and dry leather. When cutting, small flames appear that can keep burning without air assist. Never leave the laser unattended and keep a fire extinguisher ready. With an open diode laser, wear safety glasses designed for the wavelength of your laser.
Continue with: Materials to avoid and Laser extraction.