I. Overview of CO₂ Laser Coder Applications
CO₂ laser coders are industrial marking devices that use CO₂ gas as the laser medium. They generate an infrared laser beam with a wavelength of 10.6 μm by exciting CO₂ molecules through a high‑voltage electric field, and they exhibit high absorption rates for non‑metallic materials. This operating principle gives them significant advantages for permanent marking, engraving, and cutting on materials such as wood, paper, plastics, leather, glass, ceramics, and rubber.
In the Industry 4.0 era, CO₂ laser coders have become core tools for product traceability, brand identification, and anti‑counterfeiting measures. From production dates on food packaging to markings on electronic product casings, from batch codes on beverage bottle caps to traceability codes on pharmaceutical packaging, laser equipment is indispensable for precision processing. Compared with traditional inkjet coding, laser coding requires no ink, produces no pollution, involves no consumable costs, and delivers clear, permanent markings with 24/7 continuous operation capability, significantly reducing production costs for enterprises.
However, the core components of these devices are high‑energy laser sources. Industrial‑grade CO₂ laser coders typically operate at tens of watts or even higher power. Both direct and reflected beams pose serious threats to eyes and may even ignite combustible materials. Therefore, to ensure compliant export and operator safety, IEC 60825‑1 testing and certification is an essential threshold that laser products must cross before market entry.
II. Introduction to IEC 60825‑1
IEC 60825‑1 is the core laser product safety standard published by the International Electrotechnical Commission, titled “Safety of laser products – Part 1: Equipment classification and requirements”. It applies to laser products with wavelengths ranging from 180 nm to 1 mm. The latest effective version is IEC 60825‑1:2014, with a stability date extending to 2027.
The core objectives of this standard include: establishing a classification system for laser products based on optical radiation hazard levels; requiring manufacturers to provide adequate safety information; providing sufficient warnings through labels and user manuals; and reducing unnecessary accessible radiation through protective features, thereby minimising the possibility of injury.
Based on parameters such as wavelength, output power, pulse characteristics, and emission duration, the standard classifies laser products into multiple classes: Class 1 (safe under normal use), Class 1M, Class 2 (visible light, blink reflex protection), Class 2M, Class 3R (direct viewing has potential hazards), Class 3B (direct exposure causes serious harm), and Class 4 (highest risk; even diffuse reflections can cause injury). For industrial‑grade CO₂ laser coders, the vast majority fall under Class 4. Testing requires not only radiation parameter measurement but also special focus on engineering protective measures.
In China, the corresponding standard is GB/T 7247.1; in the EU, the corresponding standard is EN 60825‑1. Passing IEC 60825‑1 testing not only demonstrates compliance with international safety standards but also lays the foundation for subsequent market access certifications such as CE and FDA.
III. IEC 60825‑1 Testing Content for CO₂ Laser Coders
IEC 60825‑1 testing for CO₂ laser coders is a comprehensive safety assessment system, mainly including the following core elements:
1. Laser radiation parameter measurement – Precisely measure key parameters such as laser output power, energy density, pulse duration, and wavelength to determine the product‘s accessible emission levels. Testing is conducted in an optical darkroom using professional equipment such as integrating spheres, power meters, and spectrometers.
2. Laser class determination – Based on the measured data and the standard’s requirements, determine the product‘s final safety class. For CO₂ laser coders, due to their high‑power characteristics, the vast majority are classified as Class 4.
3. Engineering protection structure inspection – Focus on verifying the integrity of protective housings, the effectiveness of safety interlocks (e.g., power cut‑off when the door is opened), and the functional reliability of beam terminators and shutters. For Class 4 products in particular, enclosure flame resistance and interlock switch reliability must also be verified.
4. Label and user manual review – Verify the compliance of laser warning labels on the product, including laser class, wavelength, maximum output power, and other information; also review the completeness and compliance of safety operation guidelines and warning information in the user manual.
IV. IEC 60825‑1 Testing Process for CO₂ Laser Coders
The standardised testing process generally follows the “six‑step method”:
Step 1: Consultation and evaluation – The manufacturer provides product specifications, circuit diagrams, user manuals, and other documentation to the testing body. Technical experts make a preliminary class assessment based on laser source parameters and confirm test conditions. This typically takes 1‑2 working days.
Step 2: Contract signing – Confirm testing standards, items, timeline, and costs.
Step 3: Sample preparation – The manufacturer sends representative mass‑production prototypes (typically 1‑2 units) and complete technical documentation, including schematic diagrams, PCB layout diagrams, laser component specifications, label design drafts, etc.
Step 4: Laboratory testing – Engineers conduct comprehensive testing in an optical darkroom, including radiation measurement and safety structure assessment. If non‑conformities are identified, the testing body provides corrective recommendations.
Step 5: Report compilation – Compile test data and prepare the official test report.
Step 6: Report delivery – Deliver electronic and paper versions of the report, along with compliance guidance.
V. IEC 60825‑1 Testing Timeline for CO₂ Laser Coders
The testing timeline mainly depends on the laser class and structural complexity of the product. For standard single‑model products with complete documentation and smooth testing, the standard cycle from testing to issuance of an internationally recognised test report is approximately 5‑7 working days.
Some professional bodies offer expedited services that can shorten the timeline to as fast as 3 working days. If the product involves complex optical systems or structural corrections are required, the timeline may extend to approximately 15 working days.
Manufacturers should note that samples must be final mass‑production versions consistent with shipment condition; using engineering samples or prototypes may lead to inaccurate test results.
VI. Where to Find an IEC 60825‑1 Testing Body for CO₂ Laser Coders
Choosing a professional testing body with CNAS, CMA, or other authoritative accreditations is essential. Shenzhen Zhongwei Inspection Technology Co., Ltd. (CTNT) is a professional laser product testing and certification body in China, with a strong reputation in the industry.
The company operates a state‑of‑the‑art laser laboratory equipped with fully imported testing instruments, with a power measurement range covering pW to 5 kW and pulse measurement down to the picosecond level. Its engineering team has over ten years of experience in laser product testing, with extensive practical expertise capable of addressing testing needs across all laser product categories.
Testing standards comprehensively cover IEC 60825‑1, GB/T 7247.1, EN 60825‑1, as well as laser CE certification and laser FDA certification, cumulatively covering more than 70 laser‑related authorised standards, having served over 10,000 customers.
The notable advantages of Shenzhen Zhongwei Inspection include: high testing efficiency, short turnaround times, and professional reliability, providing one‑stop services from consultation and evaluation to report delivery, earning high praise from customers. For CO₂ laser coder manufacturers, choosing such an experienced and fully accredited testing body is a reliable guarantee for ensuring smooth IEC 60825‑1 certification and rapid entry into international markets.
