Fiber vs CO2 vs UV Laser Marking: Pick the Right Technology for Your Materials, Cost & Throughput

Meet the Three Laser Marking Technologies

Here is a short, plain intro to each laser before we compare them.

Fiber laser marking

A fiber laser makes light at about 1064 nm. This wavelength is made for metal. The beam is strong, fine, and very steady. Metals soak it up well, so you get fast, deep, high-contrast marks on steel, stainless steel, aluminum, brass, and titanium. Fiber lasers also run for years with few parts to replace. For most metal jobs — serial numbers, VINs, logos, and 2D codes — a fiber laser is the default pick.

CO2 laser marking

A CO2 laser makes light at about 10.6 µm (10,600 nm). It uses a sealed gas tube as its light source. This long wavelength is the opposite of fiber. It is great on non-metals and poor on bare metal. Wood, paper, cardboard, leather, acrylic, glass, and many plastics soak it up well. That makes CO2 the go-to for packaging lines, signage, and product coding on non-metals. To mark bare metal with CO2, you need a special paste or coating, so it is not the right tool for direct metal marking.

UV laser marking

A UV laser makes light at about 355 nm. This is a short, high-energy wavelength. Instead of burning the surface with heat, it gently breaks the surface bonds in a “cold” way. Very little heat spreads into the part. That makes UV the best pick for heat-sensitive materials: thin films, clear or filled plastics, medical and food packaging, glass, and ceramics. It also makes very fine, sharp text and tiny codes. You choose UV for mark quality on delicate parts, not for raw power.

The 3 Key Differences Between Fiber, CO2, and UV

These three differences decide your choice. Read them before you look at price.

Difference 1: The materials each one marks best

This is the biggest difference, and it comes straight from the wavelength.

Fiber (1064 nm) is excellent on metals. It marks steel, stainless steel, aluminum, brass, and titanium directly, with no coating. It can also mark some plastics, and a MOPA fiber widens that range. On bare metal, nothing else comes close for speed and durability.

CO2 (10.6 µm) is the opposite. It is very good on non-metals — paper, wood, acrylic, leather, glass, and many plastics — but it cannot mark bare metal on its own. If your parts are non-metal, CO2 is usually the cleanest, fastest, and most affordable fit.

UV (355 nm) sits in a special spot. It can mark many materials, but you pick it mainly for heat-sensitive ones: thin or clear plastics, medical and food packaging, glass, and ceramics. It also handles very small details that other lasers may smear.

The simple rule: metal → fiber, non-metal → CO2, heat-sensitive or very fine work → UV.

Fiber Laser Marking Machines: Key Insights

CO2 Laser Marking Machines: Key Insights

Difference 2: Mark quality and look

The three lasers leave different-looking marks.

Fiber gives high contrast on metal. You can make a deep engraved mark for wear, or a smooth black “anneal” mark with no depth. Both last through oil, heat, and washing. This matters most for barcodes and small text that must stay readable for years.

CO2 gives smooth, clean marks on non-metals and covers large areas fast. On paper, wood, and many plastics, the result is crisp and easy to read — just what packaging and product codes need.

UV gives sharp, high-contrast “cold” marks with almost no heat damage around the mark. Edges stay clean, and delicate parts do not warp, melt, or change color. This is key for medical packaging, fine electronics, and tiny QR or Data Matrix codes.

Difference 3: Cost, power use, and upkeep

This difference shapes your long-term running cost, not just the purchase price.

Power use. A modern fiber laser turns more than 40% of its electricity into useful laser power, and top models pass 50%. A CO2 laser turns about 10–20%. So for heavy metal work, fiber often lowers your power and cooling bills over time.

Lifetime and service. Fiber sources can last up to about 100,000 hours of marking, with few parts to replace. CO2 tubes typically run for tens of thousands of hours and can be serviced or swapped, so plan for the odd service stop. UV sources need a bit more care than fiber, but you pick UV for the material, not for low running cost.

The short version: fiber is the most efficient and lowest-upkeep for metal. CO2 is affordable and easy to service for non-metals. UV costs more to own but is the only clean answer for heat-sensitive parts.

When to Choose Which Solution

Choosing happens in two steps. First pick the laser type by your material. Then pick the right size and setup by your output (how many parts you mark per hour).

Step 1: Choose by material

Choose Fiber when you mark mostly metals and need lasting IDs — deep marks, black anneal on stainless, VINs, serials, and 2D codes that survive blasting, coating, and years of use. Fiber also has the lowest running cost on metal.

Choose CO2 when you mark mostly non-metals — paper, cardboard, wood, acrylic, leather, glass, and many plastics. CO2 is the best value for packaging, labels, and product coding.

Choose UV when your parts are heat-sensitive or very fine: thin films, clear or filled plastics, medical and food packaging, glass, ceramics, and tiny text. UV protects the part and still gives a sharp mark.

A note on MOPA fiber: if you mostly mark metal but sometimes need better results on plastics, or color marks on stainless steel, a MOPA fiber laser widens your range without leaving the fiber family. You can change the pulse, so one machine covers more jobs.

Mixing materials? If your jobs change often, run a two-laser setup — Fiber + CO2, or Fiber (MOPA) + UV. Two sources can cover about 95% of jobs.

Step 2: Choose by output (throughput)

Material tells you which laser. Output tells you which size and setup of that laser. “Output” means how many parts you must mark per hour, and how fast each mark must finish. Two shops can need the same laser type but very different machines, because their volumes differ.

Low volume (a few parts a day, custom or batch work). A standard desktop unit is plenty. You care more about flexibility and clean marks than raw speed. A desktop fiber or a benchtop CO2 keeps up easily.

Medium volume (steady daily batches). Now speed and quick setup matter. A higher-power fiber marks faster and finishes each part sooner. More watts usually means shorter cycle times — up to the point where your part holder, not the laser, sets the pace.

High volume (always-on lines, mass production). Here you speed up the whole cycle, not just the laser. Use “on-the-fly” (flying) marking, where parts move past the laser without stopping. Add helpers: a rotary axis for round parts, part feeders, jig trays, or conveyor sync. For non-metal lines, an inline flying CO2 system codes products at full line speed.

Match power to your time-per-part. Work out how many seconds you have per part to keep the line moving. Pick a laser power that finishes the mark inside that window with room to spare. Too little power slows the line. Far too much power adds cost you may not need. Not sure? Send us your part and target speed — we will test it and tell you the right power and setup.

Plan for uptime. High output means you cannot afford long stops. This is where fiber shines: high efficiency and long source life keep the line running with few service breaks. If you run CO2 hard, schedule tube service so it never surprises you.

2) Packaging, FMCG & converters

• Why you care: clean codes at line speed on non-metals, with no ink or solvents.
• Best fit: CO2 for paperboard, labels, glass, and many plastics; UV when films are thin or heat-sensitive.
• Recommended HeatSign machine: the Flying CO2 Laser Marking Machine (HS-CLY40) — marks dates, lot numbers, and logos “on-the-fly” without stopping the conveyor.

3) Electronics & medical devices

• Why you care: readable micro-text and 2D codes with almost no heat, plus UDI compliance.
• Best fit: UV for thin and clear plastics; Fiber (MOPA) for some engineered plastics.
• Recommended HeatSign machine: the HS-UV05 5W UV Laser — clean, fine marks on films, plastics, and glass.

Cost, Efficiency & Maintenance

• Energy efficiency: Modern industrial fiber sources typically run >40% wall-plug efficiency, with premium platforms surpassing 50%; CO2 designs commonly sit around ~10–20% depending on architecture. This is why many factories see meaningful OPEX savings when they standardize on fiber for metal work.
• Lifetime & service: Fiber sources are often specified up to ~100,000 h MTBF for marking use; sealed RF CO2 tubes are widely documented in the tens of thousands of hours and can be refurbished or replaced in the field—plan for periodic service with CO2, less so with fiber.
• Plastics & delicate substrates: When heat is your constraint, UV earns its keep: high absorption and “cold marking” on many plastics and Tyvek® with excellent contrast.

MOPA Fiber? If you occasionally need better plastic performance or colored marks on stainless, MOPA (variable pulse width) broadens your process window without abandoning fiber. Use UV when your substrate is truly heat-sensitive or clear

Recommended HeatSign Solutions

• Metals / general marking: Desktop Fiber Laser Marking Machine  — stable, fast, maintenance-free.
• Non-metals / packaging lines: Flying CO2 Laser Marking Machine (HS-CLY40) — high-speed “on-the-fly” coding.
• Heat-sensitive / fine features: HS-UV05 5W UV Laser — clean marks on films, plastics, and glass.