| Steel, stainless, mild steel, titanium and engineering alloys | Fibre at about 1064 nm | Anneal, oxide colour change or material removal, depending on power and pulse settings | An annealed mark leaves the stainless passive surface intact. An engraved mark breaks it and can become a corrosion site, so mark type is a real decision rather than a setting, and it is made against what the part goes through after marking. |
| Anodised and coated aluminium | Pulse-controlled MOPA fibre, typically 4 to 200 ns at 1.6 kHz to 1 MHz | Dense black formed inside the anodic layer, with the surface left sealed and the finish intact | A mark inside a coating exists only within the coating thickness, so sustained abrasion eventually reaches through it. Where the product is handled hard, the specification is a mark into the base metal before anodising, or a harder finish over the top, decided at the sample run. |
| Copper, brass, gold and silver | Green at 515 or 532 nm | Stable, repeatable coupling into metals that reflect infrared | Absorption at 1064 nm is only a few percent at room temperature and climbs sharply below about 600 nm, so a reflective alloy is a source selection question rather than a power question. |
| Oak, pine, ply, MDF, kraft and rigid card | CO2 at 9.3, 10.2 or 10.6 micron | Controlled char for engraving and branding, and a clean cut edge through sheet stock | Surface moisture absorbs energy and escaping steam disturbs the mark as it forms, so parameters are set per product. The window between a clean mark and burn through on thin card is narrow, so each stock is characterised once and saved as its own machine profile. |
| Cast and extruded acrylic, dibond, engineering plastics | CO2 on acrylic and dibond, UV at 355 nm on heat sensitive grades including PP, POM, PBT and polyamide | Frosted engrave and polished cut edge on acrylic, high contrast marks on plastics that foam or char under long pulses | UV breaks the bond photochemically rather than heating it, so there is effectively no heat affected zone on thin and sensitive stock. Contrast on unfilled polymers is the variable, so it is a sample and test conversation rather than an assumption. |
| Glass, quartz and ceramics | UV at 355 nm, with CO2 where a frosted sandblasted look is what the piece calls for | Clean photochemical marks on technical glass, frosted engraving on drinkware and award pieces | 1064 nm passes through clear glass rather than being absorbed, which is a fixed property of the wavelength, so the answer is the source rather than more power. Fixturing and support carry as much of the result as the parameters on a thin-walled piece. |
| Leather, canvas, denim and fabric applique | CO2 | Sealed cut edges on leather and canvas, controlled surface char for branding on denim | Energy per millimetre is the controlled quantity here, not peak power, and it moves with weight and weave. The parameter set is proved on your own roll and the wash durability result is recorded with it. |
| Foam inserts and packaging film | CO2, at 9.3 micron where the substrate is PET | Fitted foam cavities cut to the product, and readable codes formed in film | PET barely absorbs 10.6 micron and absorbs 9.3 micron efficiently, which is the difference between a readable code and no code at all. On laminated packs the barrier layer is checked as part of the specification rather than after the run. |