Hard Plastics ABS, PVC, PC: Fiber, UV or CO₂ 1

Hard plastics look simple until you try to mark them. ABS, PVC and PC​ share almost nothing at the molecular level: ABS is a styrene-based terpolymer with good beam absorption, PVC is chlorine-rich and releases corrosive gas when overheated, and polycarbonate (PC)​ has high optical clarity and a high glass-transition temperature, so it either absorbs poorly or chars. A 1064 nm fiber​ beam, optimised for steel and aluminium, often glints off plastic, melts the surface or leaves a grey, uneven stain; a CO₂ 10.6 µm​ beam is absorbed by many organics but can cut, warp or burn edges on thin parts; a 355 nm UV​ beam breaks molecular bonds coldly at 0.1–1 µm depth and is therefore the safest for heat-sensitive, clear and thin-wall plastics. The buying rule for an English-site visitor is not “which laser is newest,” but which wavelength the polymer tolerates. LAMBD covers the full decision with T6 Mini / LM-11-3 / LM-1-x fiber (1064 nm), UV T3 3/5/10 W (355 nm, water-cooled 20–25 °C ±0.5 °C, 20,000–30,000 h tube life)​ and CA2-1 30 W / CO₂-1-2 100 W / CO₂-3-4 (10.6 µm)​ — one EZCAD + JCZ​ software stack, one set of operator skills, and variable data from Excel via CSV. Match the wavelength to the plastic first; only then talk about power, speed and price.

For ABS​ (the common case), 1064 nm fiber is the default: it gives a fast, permanent black or grey mark at 15–30% power, 30–60 kHz, 500–1200 mm/s, 1–2 passes​ on LM-11-3 30 W, and the same part can be marked in under a second. Black ABS accepts fiber well; light-coloured ABS may need a higher-frequency MOPA (LM-1-5 20–30 W / LM-1-6 50 W, pulse <10 ns–~200 ns, up to 4000 kHz) for a cleaner edge. PVC​ is where discipline matters more than power: it is chlorinated, so excessive energy produces HCl and surface pitting. Use fiber at 10–20% power, 40–80 kHz, 600–1500 mm/s, 1 pass, keep the mark shallow, add fume extraction, and never deep-engrave PVC on a high-power machine — LAMBD treats PVC as a marking-only material. For high-gloss, thin-wall, transparent or medical-grade ABS/PVC​ where a burnt smell or edge melt is unacceptable, switch to UV T3 at 355 nm: the cold process leaves a white or frosted code on black ABS and a clean, crack-free mark on PVC without the heat-affected zone. The T3 5 W model, for example, is rated around 1000 W chiller draw, 20–25 °C ±0.5 °C crystal control, 20,000–30,000 h tube life, and delivers a 0.01 mm line at ±0.001 mm repeatability​ — ideal for a serial number or micro-QR on a casing. These are starting-point recipes, not universal settings: colour, filler, gloss, wall thickness and flame retardant change the result, so LAMBD always recommends a 30-second sample and a saved EZCAD recipe before production.

Polycarbonate (PC)​ is the material that most often exposes the wrong wavelength choice. Its high clarity and heat resistance make 1064 nm fiber unreliable — you get a weak stain, a burnt ring or no mark at all — while 10.6 µm CO₂ is absorbed and can mark, but the edge effect is aggressive: the part may warp, the mark may be too deep, and clear PC can craze. For clear, tinted, frosted or thin-wall PC, LAMBD recommends UV 355 nm: it marks by photochemical ablation, not bulk heating, so a clear lens or transparent cover stays optically clean and a thin-wall part stays flat. On black PC, UV T3 gives a high-contrast white code; on clear PC, a frosted Data Matrix; on coated PC, a clean logo without lifting the coating. CO₂ 10.6 µm​ still has a place, but as a cutting and deep-marking tool​ rather than a precision code marker: CA2-1 30 W frosts and cuts acrylic and some coated PC signs at 20–40 W, 200–500 mm/s, 1–2 passes, while CO₂-1-2 100 W and CO₂-3-4 handle larger panels and signage. The dividing line is simple — if the job is a permanent serial, QR, logo or medical code on a finished part, choose UV; if it is cutting sheets, letters, displays or thick panels, choose CO₂. LAMBD keeps both in one catalogue and one software family, so a workshop can mark casings with UV and cut display stands with CO₂ without retraining operators.

Two parts sold as “ABS” can behave like different materials once colour, filler and flame retardant enter the mix. White, grey and pastel ABS​ absorb less at 1064 nm and tend to mark lighter, so increase frequency into the MOPA range or move to UV; black ABS​ with carbon black absorbs strongly and marks dark and fast. Glass-filled nylon and ABS​ conduct heat into the filler and can leave a rough, burnt mark — lower power, higher speed and a fume extractor are mandatory. Flame-retardant (FR) grades​ of ABS, PC and PVC release more gas and odour, so never mark them in an open workshop without extraction, and keep the pass count low to avoid surface degradation. Soft-touch, TPE and rubberised coatings​ melt easily; use UV or very low-power fiber only. Transparent acrylic and clear PC​ need UV for a code but CO₂ for cutting — a common LAMBD workflow is UV T3 for the serial and CO₂-1-2 for the shape. The practical protocol is: (1) identify the exact resin and colour, (2) run a three-wavelength test​ on one part — fiber at low power, CO₂ at low power, UV at standard power, (3) compare contrast, edge, odour and post-mark flatness, (4) cycle the part through washing and handling to simulate use, (5) save the winning recipe by resin + colour + wall thickness​ in EZCAD. Because every LAMBD fiber, UV and CO₂ system shares files and CSV variable data, the same serial number can move from a UV-marked PC casing to a CO₂-cut acrylic plate without re-entering the database.

Selection​ is a three-step decision. Step 1 — define the part.​ If it is a metal-and-plastic assembly, start with fiber 1064 nm: T6 Mini 5–20 W for low volume and jewellery, LM-11-3 20–30 W for production ABS/PVC, and LM-1-x MOPA 20–100 W when colour or high reflectivity matters. Step 2 — define the plastic.​ If it is clear, thin-wall, medical, electronic or heat-sensitive PC/ABS/PVC, choose UV T3 3/5/10 W​ and a water chiller at 20–25 °C ±0.5 °C; budget for the higher CapEx and the 20,000–30,000 h tube life. Step 3 — define the operation.​ If it is cutting, signage, displays, wood or leather as well as marking, add CO₂: CA2-1 30 W for the bench, CO₂-1-2 100 W for roll-fed and batch work, CO₂-3-4 for large format. The EZCAD + JCZ​ workflow then unifies everything — BMP, JPG, GIF, PNG, TIF, AI, DXF, DST and PLT​ files, red-light focus, motorised Z and CSV-driven serial numbers, dates, lots and QR codes. Process control is what turns a good wavelength into a sellable result: clean the F-theta lens, fit a fume extractor for PVC and FR grades, warm the UV chiller for 4–6 minutes, lock the recipe to the exact resin and colour, and verify every code with a scanner to ISO/IEC 15415 grade​ and a CCD camera on LM-8-1 or LM-9-2. For an English-site buyer the conclusion is direct: treat ABS, PVC and PC as three different materials, prove the wavelength on a real part, and let LAMBD supply the fiber, UV and CO₂ line that matches the plastic — not the other way around.

ABS, PVC and PC​ cannot be marked by guesswork. ABS​ is the fiber-friendly default at 1064 nm​ (15–30% power, 30–60 kHz, 500–1200 mm/s), PVC​ is a low-power, well-extracted marking-only job on fiber (10–20%, 40–80 kHz, 600–1500 mm/s), and PC​ — especially clear, thin-wall and heat-sensitive grades — is the domain of UV 355 nm, which marks coldly without warping, burning or crazing. CO₂ 10.6 µm​ is the cutting and large-format tool for organics, not the first choice for a precision code on a finished plastic part. LAMBD supports all three decisions with a single ecosystem: fiber (T6 Mini, LM-11-3, LM-1-x, LM-9-2), UV (UV-1-1, T3 3/5/10 W) and CO₂ (CA2-1, CO₂-1-2, CO₂-3-4), all on EZCAD + JCZ, all sharing CSV variable data, all capable of 0.01 mm lines at ±0.001 mm repeatability​ where the wavelength permits. The buying discipline is to test the real part — resin, colour, filler, flame retardant and wall thickness — then lock the recipe and verify the code by scanner and CCD. For an English-site audience, the takeaway is clear: a laser does not choose the plastic; the plastic chooses the laser, and LAMBD is set up to supply whichever wavelength the part demands.