Metal engraving with a CO₂ laser is a popular topic among makers, small businesses, and laser enthusiasts, but it often comes with confusion.
Since CO₂ lasers can’t directly engrave bare metal like fiber or IR lasers, understanding what is possible and how to do it correctly is the key to success.
Table of Contents
In this complete guide, you’ll learn how CO₂ lasers work on metal, the best methods for engraving, recommended materials and settings, and when a CO₂ laser makes sense for metal projects.
Can You Engrave Metal with a CO₂ Laser?
Yes—but with limitations.
A CO₂ laser (10.6 μm wavelength) cannot directly engrave raw metals like stainless steel or aluminum because metal reflects this wavelength. However, CO₂ lasers can engrave metal surfaces indirectly using:
- Marking compounds (xTool Black Laser Marking Spray, Brilliance Laser Inks)
- Coated or anodized metals
- Painted or powder-coated metals
These methods allow you to create permanent, high-contrast marks suitable for signage, tags, branding, and decorative applications.
Best Metals for CO₂ Laser Engraving
Anodized Aluminum
- Direct engraving
- Laser removes the anodized layer
- Reveals bright silver aluminum underneath
- Ideal for nameplates, tags, and plaques
Painted or Powder-Coated Metals
- Laser burns away paint or coating
- Creates sharp, high-contrast designs
- Common for tumblers, signage, and panels
Coated Brass & Steel
- Works well if surface coating is laser-safe
- Engraving removes coating, not the base metal
How Metal Engraving with a CO2 Laser Works
CO2 lasers primarily emit infrared light and are more suited for cutting or engraving organic materials like wood, leather, and acrylic.
However, by using specific marking sprays or pastes, CO2 lasers can also engrave metals like stainless steel, brass, aluminum, and titanium.
Here’s how the process works. First, a laser marking spray or paste is applied evenly to the metal surface. When the CO₂ laser engraves the coated area, the heat activates the marking compound, causing it to bond permanently to the metal.
After the engraving is complete, any excess marking spray is rinsed or wiped away, leaving behind a crisp, high-contrast mark that is durable, permanent, and resistant to fading or wear.
Best Marking Spray for Metal Engraving with a CO2 Laser – Comparison Table
Feature | xTool Black Laser Marking Spray 2.0 | Brilliance Laser Inks BLI101 | OMTech Laser Marking Spray |
|---|---|---|---|
Can Size | 8.5 oz | 12 oz | 13 oz |
CO₂ Laser Requirement | ≥ 25W | ≥ 25W | ≥ 25W |
Other Laser Compatibility | Fiber (≥10W), Diode (≥10W) | Fiber, YAG, Diode | Fiber |
Marking Color | Deep black | Deep black | Black (turns black after engraving) |
Marking Durability | Permanent, fade- & corrosion-resistant | Permanent, scratch- & fade-resistant | Permanent, heat-resistant |
Best Metals | Stainless steel, aluminum, copper | Stainless steel, brass, copper, aluminum | Aluminum, stainless steel, brass |
Application Quality | Fine mist, clog-proof nozzle | Thin coat, anti-clog technology | Smooth, even coating |
Drying Time | <5 minutes (≈2 min with heat) | <5 minutes (≈2 min with heat) | <5 minutes (≈2 min with heat) |
Cleanup After Engraving | Rinse with water | Rinse and wipe | Simple rinse |
Ease of Use | Easy | Easy | Very easy |
Coverage Efficiency | High | Very high (≈25% more coverage) | High |
Best For | Multi-laser users & professional branding | Best overall CO₂ metal marking | Fast, budget-friendly CO₂ marking |
Overall Rating | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐½ |
Quick Recommendation
- Best Overall CO₂ Marking Spray: Brilliance Laser Inks BLI101
- Best Multi-Laser Compatibility: xTool Black Laser Marking Spray 2.0
- Best Value & Fast Workflow: OMTech Laser Marking Spray
Metal Engraving with a CO2 Laser Using Brilliance Laser Inks
Engraving metal with a CO2 laser typically requires a marking agent, as CO2 lasers are not directly absorbed by bare metal surfaces.
Brilliance Laser Inks provide an effective solution, allowing users to create high-contrast, durable marks on metals like stainless steel, copper, brass, and aluminum.
This guide will walk you through the process of engraving these metals using a CO2 laser engraver.
Materials You Will Need:
- CO2 Laser Engraver (Minimum of 25 watts, ideally 50watts and above)
- Brilliance Laser Inks (12 Oz Black Aerosol)
- Metal Substrates (Stainless Steel, Copper, Brass, Aluminum)
- Cleaning Supplies (Isopropyl alcohol, lint-free cloth)
- Safety Gear (Goggles, gloves)
Step-by-Step Guide to Metal Engraving with a CO2 Laser
Step 1: Prepare Your Metal Surface
Before applying the marking agent, it’s important to thoroughly clean the metal surface. This ensures that the engraving process goes smoothly and that the markings adhere properly.
Use isopropyl alcohol and a lint-free cloth to wipe away any dirt, grease, or residue from the metal surface. Allow the metal to dry completely before moving to the next step.
Step 2: Apply Brilliance Laser Inks Marking Agent
Shake the Brilliance Laser Inks aerosol can for about 1-2 minutes to ensure the ink is well-mixed. Holding the can approximately 6-8 inches away from the stainless steel surface, apply an even coat of the ink.
Make sure the surface is fully covered with a thin layer. Avoid over-spraying or creating thick, uneven coats, as this can affect the quality of the engraving.
Let the marking agent dry completely. This may take a few minutes, depending on your workspace conditions.
Step 3: Set Up Your CO2 Laser Engraver
To achieve the best results:
- Laser Power: Start with a lower power setting and gradually increase if needed.
- Speed: Adjust the engraving speed depending on the detail of the design. A slower speed allows for deeper marking.
- Resolution: A resolution setting of 300 to 500 DPI typically yields clear and precise engravings.
Step 4: Create A Material Test Grid
A material test grid is an essential tool for determining the optimal laser settings for engraving metals with a CO2 laser engraver.
Since CO2 lasers require marking agents like Brilliance Laser Inks to engrave metals such as stainless steel, copper, brass, and aluminum, testing different settings ensures high-quality results.
Why Use a Material Test Grid?
A material test grid helps:
- Identify the best combination of power, speed, and frequency for metal engraving.
- Optimize engraving depth and contrast.
- Reduce material waste by minimizing trial and error.
- Improve consistency in engraving results.
Step-by-Step Guide to Creating a Material Test Grid
Step 1: Design the Test Grid
- Create a Grid Layout – Use design software like LightBurn, Adobe Illustrator, or CorelDRAW to create a matrix of squares (e.g., 5×5 or 10×10 grid).
- Assign Variable Settings:
- Power Levels: Increase incrementally (e.g., 10%, 20%, 30%, etc.).
- Speed Settings: Adjust from slow to fast (e.g., 50mm/s, 100mm/s, etc.).
- Frequency (DPI): Modify resolution settings for clarity (e.g., 250 DPI to 1000 DPI).
Step 2: Configure Laser Settings
- Set the Focal Distance – Adjust the focus precisely for accurate engraving.
- Import the Test Grid File – Load your grid into the laser software.
- Assign Engraving Parameters – Match power, speed, and frequency to each square.
Step 3: Perform the Test Engraving
- Secure the Metal Sheet – Ensure it lies flat and does not shift.
- Engrave the Grid – Run the test with the pre-set parameters.
- Evaluate Results:
- Check contrast and depth.
- Identify which settings produce the clearest, most durable marks.
- Adjust as needed for better results.
Step 5: Clean and Finalize Settings
- Remove Excess Marking Agent – Rinse the metal with water or wipe it with a damp cloth.
- Document the Best Settings – Note down the most effective power, speed, and DPI for future reference.
Creating a material test grid is crucial for optimizing metal engraving with a CO2 laser engraver and Brilliance Laser Inks.
By systematically testing various settings, you can achieve precise, high-contrast, and durable engravings on stainless steel, copper, brass, and aluminum. This process ensures efficiency and consistency in all your metal engraving projects.
Tips for Achieving the Best Results:
- Use a Test Piece: Always test your laser settings on a scrap piece of metal before engraving the final piece.
- Ensure Even Application: Apply Brilliance Laser Inks evenly to avoid patchy or inconsistent engravings.
- Optimize Your Laser Settings: Adjust the power, speed, and resolution based on the complexity and size of your design.
Best CO₂ Laser Settings for Metal Engraving
Settings vary by machine power, optics, and material—always test first
The exact settings will vary depending on your machine, lens, laser power, and the marking product you use, but the table below provides reliable starting points for most applications.
Material | 30W CO₂ | 40W CO₂ | 55W CO₂ | 80W CO₂ | 100W CO₂ |
|---|---|---|---|---|---|
Stainless Steel | 180 mm/min (7.1 in/min) 100% Power | 250 mm/min (9.8 in/min) 100% Power | 350 mm/min (13.8 in/min) 90% Power | 450 mm/min (17.7 in/min) 80% Power | 550 mm/min (21.7 in/min) 70% Power |
Bare Aluminum | 150 mm/min (5.9 in/min) 100% Power | 220 mm/min (8.7 in/min) 100% Power | 300 mm/min (11.8 in/min) 95% Power | 400 mm/min (15.7 in/min) 85% Power | 500 mm/min (19.7 in/min) 75% Power |
Anodized Aluminum (No marking spray required) | 350 mm/min (13.8 in/min) 60% Power | 450 mm/min (17.7 in/min) 50% Power | 600 mm/min (23.6 in/min) 45% Power | 800 mm/min (31.5 in/min) 35% Power | 1,000 mm/min (39.4 in/min) 30% Power |
Brass | 150 mm/min (5.9 in/min) 100% Power | 220 mm/min (8.7 in/min) 100% Power | 300 mm/min (11.8 in/min) 95% Power | 400 mm/min (15.7 in/min) 85% Power | 500 mm/min (19.7 in/min) 75% Power |
Copper | 120 mm/min (4.7 in/min) 100% Power | 180 mm/min (7.1 in/min) 100% Power | 250 mm/min (9.8 in/min) 95% Power | 350 mm/min (13.8 in/min) 90% Power | 450 mm/min (17.7 in/min) 80% Power |
Recommended Settings
Setting | Recommended Value |
|---|---|
DPI | 500–600 |
Passes | 1 |
Air Assist | Off (except low airflow for anodized aluminum if needed) |
Focus | Slightly defocus by 1–2 mm (0.04–0.08 in) for darker marks |
Marking Spray | Required for all bare metals except anodized aluminum |
Limitations of CO₂ Lasers for Metal
While versatile, CO₂ lasers are not ideal for deep metal engraving.
What CO₂ Lasers Cannot Do
- Deep engraving into bare metal
- True metal cutting
- High-speed metal marking without compounds
If you need deep, fast, or color metal engraving, a fiber or IR laser is a better choice.
Final Thoughts
Metal engraving with a CO2 laser offers an efficient and effective way to mark metals when using the proper tools and techniques.
While fiber lasers are generally more suited for metal engraving, CO2 lasers, when paired with a marking spray, provide an excellent alternative for adding personalized designs or durable markings to metal surfaces.
By following the steps outlined in this guide and paying close attention to laser settings, you can achieve professional-quality engravings on a variety of metals.
Frequently Asked Questions
Can a CO₂ laser engrave metal directly?
No, a CO₂ laser cannot engrave bare metal directly because its wavelength is not readily absorbed by metal surfaces. Instead, a laser marking spray or compound (such as Brilliance Laser Inks, or xTool Black Marking Spray) is required to create permanent marks.
What is the best marking spray for metal engraving with a CO2 laser?
Popular and proven options include Brilliance Laser Inks BLI101, xTool Black Laser Marking Spray 2.0, and OMTech Laser Marking Spray. These sprays chemically bond to the metal when heated by the laser, producing durable, high-contrast black markings.
What CO₂ laser wattage is needed for metal marking spray?
Most metal marking sprays require a minimum of 25W CO₂ laser power. Higher wattage machines (40W–60W+) generally produce darker, more consistent results and allow for faster engraving speeds.
Do I need to prepare the metal before engraving?
Yes. Proper surface preparation is critical. Clean the metal thoroughly with isopropyl alcohol or acetone to remove oils, dirt, and coatings. A clean surface ensures strong bonding and prevents patchy or faded markings.
How do I remove excess marking spray after engraving?
After engraving, allow the piece to cool and rinse with water. Light wiping with a soft cloth is usually enough to remove unbonded spray. Avoid scrubbing aggressively, as this can damage the freshly bonded mark.