An explosion-proof collaborative robot is a cobot specifically engineered and certified to operate safely in environments where flammable gases, combustible dusts, or ignitable fibers are present. Unlike standard industrial cobots, these specialized machines carry dual explosion-proof certifications — both domestic (e.g., Chinese Ex standards) and international (European ATEX/IECEx) — and are sealed to IP68 protection, making them suitable for deployment in Zone 1 and Zone 2 hazardous areas. As industries such as oil and gas, chemical processing, and munitions handling seek to automate dangerous manual tasks, explosion-proof cobots are emerging as a critical — and still largely untapped — automation category.
Why Do Hazardous Environments Need Explosion-Proof Cobots?
The Problem: Manual Labor in Dangerous Zones
Workers in petrochemical plants, refineries, paint shops, and ammunition facilities face daily exposure to explosive atmospheres. Manual tasks in these environments — including material handling, equipment operation, surface coating, and quality inspection — carry inherent risks of ignition from electrical sparks, hot surfaces, or static discharge.
Traditional automation solutions have struggled in these settings. Standard industrial robots are not certified for hazardous areas, and retrofitting them with explosion-proof enclosures is complex, expensive, and often impractical. The result is that many dangerous tasks in explosive atmospheres still rely on human labor.
The Solution: Purpose-Built Explosion-Proof Cobots
Explosion-proof cobots address this gap by integrating hazardous-area protection directly into the robot’s design — from motor windings and encoders to cable glands and control electronics. Every component that could potentially generate a spark or exceed safe surface temperatures is engineered to prevent ignition.
These cobots maintain the core advantages of collaborative robots — intuitive programming, flexible deployment, human-safe interaction — while adding the specialized protection required for classified hazardous areas.
Understanding Explosion-Proof Standards and Certifications
Hazardous Area Classification
According to international standards (see OSHA robotics safety standards for U.S. guidance), explosive environments are classified by the type and likelihood of hazardous material present:
| Classification | Description | Typical Locations |
|---|---|---|
| Zone 0 / Division 1 | Explosive atmosphere present continuously | Inside tanks, vessels |
| Zone 1 / Division 1 | Explosive atmosphere likely during normal operation | Near tank openings, filling points |
| Zone 2 / Division 2 | Explosive atmosphere unlikely, only under abnormal conditions | General plant areas, storage |
Explosion-proof cobots are typically certified for Zone 1 and Zone 2 (gas atmospheres) and Zone 21/22 (dust atmospheres), covering the vast majority of deployment scenarios in processing plants and industrial facilities.
Protection Methods Explained
Explosion-proof certification marks encode the specific protection methods used. A typical marking such as “Ex db eb ib pxb IIC T5 Gb” indicates multiple layers of protection:
- db (flameproof enclosure): Contains any internal explosion and prevents it from igniting the surrounding atmosphere
- eb (increased safety): Provides enhanced reliability to prevent sparks or excessive temperature
- ib (intrinsic safety): Limits electrical energy below ignition thresholds
- pxb (pressurized enclosure): Maintains positive internal pressure to exclude explosive gases
- IIC: Suitable for the most demanding gas group (including hydrogen and acetylene)
- T5: Maximum surface temperature of 100°C — well below the ignition point of most industrial gases
The European equivalent marking “Ex II 2G Ex db pxb IIC T4 Gb” confirms compliance with the ATEX directive for Group II (non-mining) equipment in Zone 1 gas environments.
Dual Certification: Why It Matters
Leading explosion-proof cobots carry both domestic and European certifications simultaneously. This dual certification means the product can be deployed globally without additional compliance work — critical for multinational oil and gas companies and EPC contractors operating across regulatory jurisdictions.
Explosion-Proof Cobot Product Lineup
A comprehensive explosion-proof cobot portfolio spans multiple payload and reach configurations to match different application requirements:
| Model | Payload | Reach | Repeatability | Max Speed | Weight | IP Rating |
|---|---|---|---|---|---|---|
| XR6 | 6 kg | 924 mm | ±0.02 mm | 3 m/s | 21 kg | IP68 |
| XR9 | 9 kg | 1,500 mm | ±0.05 mm | 3 m/s | 37 kg | IP68 |
| XR12 | 12 kg | 1,300 mm | ±0.03 mm | 3 m/s | 36 kg | IP68 |
| XR18 | 18 kg | 900 mm | ±0.02 mm | 3 m/s | 35 kg | IP68 |
| XR20 | 20 kg | 1,800 mm | ±0.05 mm | 4 m/s | 68 kg | IP68 |
All models feature 6 degrees of freedom, EtherCAT/1KHz control bus, and operating temperature range of -5°C to 55°C. Noise levels remain at or below 60 dB across the range.
Explosion-Proof Control Cabinets
The robot arm is only one part of the system. Explosion-proof deployments require matched control infrastructure:
Flameproof control cabinet: Full-size enclosure with IP65 protection, alarm lighting, and comprehensive I/O expansion. Rich external interfaces suit Zone 1 and Zone 2 gas and dust environments. Suited for complex installations requiring multiple digital and analog I/O channels.
Positive-pressure control cabinet: Compact design, IP65 rated, easier to deploy. Maintains positive internal pressure to prevent ingress of explosive atmosphere. Ideal for space-constrained installations where a smaller footprint is needed.
Both cabinet types support EtherCAT fieldbus, Modbus-TCP, RS485 communication, and provide emergency stop, safety stop, digital I/O, and differential encoder inputs.
Key Application Scenarios
Automotive Fueling Automation
Robotic fueling systems eliminate human exposure to gasoline vapors during the refueling process. The cobot’s explosion-proof certification ensures safe operation in the vapor-rich zone around fuel dispensers, while its precision enables accurate nozzle positioning for different vehicle types.
Industrial Painting and Powder Coating
Spray painting and powder coating generate explosive atmospheres from solvent vapors and combustible dust particles. Explosion-proof cobots with drag-and-teach programming allow operators to define spray paths intuitively, and VR-guided programming further reduces the need for skilled technicians in the hazardous zone.
Munitions and Propellant Handling
Ammunition manufacturing and propellant loading involve materials with extremely low ignition thresholds. Explosion-proof cobots handle filling, assembly, and inspection tasks with the precision and repeatability needed for quality assurance, while keeping human workers at a safe distance.
Chemical Processing Operations
In chemical plants, cobots perform sampling, valve operation, vessel cleaning, and material transfer in areas classified as Zone 1 or Zone 2. Their compact size allows deployment in confined spaces typical of process plant layouts.
Extreme-Temperature Cobots: Extending the Envelope
Beyond explosion-proof capability, specialized cobots are now available for extreme thermal environments — an industry first. These extreme-temperature models operate across a -30°C to 80°C range (compared to the standard -5°C to 55°C), with IP68 protection throughout.
| Model | Payload | Reach | Repeatability | Temp Range | IP Rating |
|---|---|---|---|---|---|
| AL6 | 6 kg | 924 mm | ±0.02 mm | -30°C to 80°C | IP68 |
| AL9 | 9 kg | 1,500 mm | ±0.05 mm | -30°C to 80°C | IP68 |
| AL12 | 12 kg | 1,300 mm | ±0.03 mm | -30°C to 80°C | IP68 |
Cold-Chain and Freezer Applications
Cold-chain logistics — frozen food warehousing, pharmaceutical cold storage, ice cream production — requires robots that function reliably at sustained sub-zero temperatures. Standard cobots experience lubricant thickening, sensor drift, and cable brittleness below -5°C. Extreme-temperature models are engineered from the ground up to maintain performance at -30°C.
Hot Forging and High-Temperature Processes
At the other extreme, cobots deployed for hot forging spray-quench applications operate near 1,200°C workpieces. One documented deployment involved a cobot performing mold release agent spraying in a hot forging process, subject to extreme thermal cycling, 40 kW electromagnetic interference from induction heaters, and sustained overload beyond its rated payload — running continuously for over two years without failure.
Selection Considerations for Hazardous Environments
When specifying an explosion-proof cobot, consider these factors beyond standard selection criteria:
Zone classification: Confirm the specific hazardous area classification (Zone 1, Zone 2, Zone 21, Zone 22) and ensure the cobot’s Ex marking covers your requirement.
Gas group compatibility: IIC certification covers the broadest range of gases (including hydrogen). If your application involves less demanding gas groups (IIA or IIB), IIC-certified equipment provides a built-in safety margin.
Temperature class: Verify that the cobot’s maximum surface temperature rating (T-class) is below the auto-ignition temperature of all materials present in the workspace.
Control cabinet selection: Match the cabinet type to your installation — flameproof for full-featured installations with extensive I/O, positive-pressure for compact deployments.
Cable routing: Hazardous area installations require certified cable glands, conduit, and routing practices that maintain the integrity of the explosion-proof boundary.
Frequently Asked Questions
Can standard cobots be used in hazardous environments?
No. Standard cobots are not designed or certified for explosive atmospheres. Their electrical components, motors, and connectors can generate sparks or exceed safe surface temperatures, creating ignition risks. Only cobots carrying specific explosion-proof certifications (Ex marking) should be deployed in classified hazardous areas.
What does IP68 mean for an explosion-proof cobot?
IP68 is the highest ingress protection rating, indicating complete dust-tightness and the ability to withstand continuous submersion in water. For explosion-proof cobots, IP68 ensures that the internal electronics are completely sealed from the surrounding atmosphere — no explosive gas or dust can enter the enclosure under any operating condition.
How do explosion-proof cobots compare in cost to standard models?
Explosion-proof cobots carry a price premium over standard industrial models due to specialized enclosures, certified components, and dual certification processes. However, this must be weighed against the alternatives: the cost of manual labor in hazardous zones (including hazard pay, training, PPE, and incident risk), the impracticality of retrofitting standard robots, and the regulatory compliance burden. For applications where automation of hazardous tasks is the goal, purpose-built explosion-proof cobots typically offer the most cost-effective path.
Summary
Explosion-proof collaborative robots fill a critical gap in industrial automation — bringing the flexibility and ease-of-use advantages of cobots to environments where standard robots simply cannot operate. With dual-certified protection methods, IP68 sealing, and payload options from 6 kg to 20 kg, these specialized cobots are ready for deployment across oil and gas, chemical processing, automotive painting, and munitions handling.
For facilities also facing extreme temperature challenges, the latest extreme-temperature cobot models extend the operating envelope to -30°C through 80°C, unlocking automation possibilities in cold-chain logistics and hot forging processes.
Related reading:
– Complete guide to collaborative robots — types, selection and applications
– Cobot ROI calculator — justifying your investment for SME manufacturing
– Automotive-grade cobots — what IATF16949 means for robot quality
Last updated: March 2026. Certification details and protection markings referenced in this article are based on publicly available product specifications and international standards documentation.