ATEX Compliance for the
Food Industry — Dust Is the Hazard
Flour, sugar, starch, cocoa, spice — fine organic dusts are explosive, and food processing facilities are full of them. Zone 20/21/22 classification, Ex equipment inspection, and EPD preparation for food and beverage manufacturers across Europe.
flour dust (minimum explosive conc.)
Zone 20 / 21 / 22
food dusts are typically St1 or St2
across Europe
The Food Industry Hazard
Most Food Facilities Have Dust Explosion Hazards — Many Don't Know It
Organic dusts from food processing are explosive. A dust cloud at the right concentration, encountering any ignition source, can produce a primary explosion — and the pressure wave can suspend settled dust to create a far more destructive secondary explosion.
- Flour, sugar, starch, cocoa, coffee, spice, and milk powder are all classified as combustible dusts
- ATEX Directive 1999/92/EC applies equally to dust and gas — food facilities are not exempt
- Zone 20/21/22 classification is mandatory wherever combustible dust can form an explosive cloud
- Ex equipment is required in classified dust zones — standard IP-rated equipment is not sufficient
- Dust layers on surfaces are a secondary explosion risk — cleaning regimes are part of ATEX compliance
- Many food facilities also handle cleaning solvents or flavour extracts — creating combined gas and dust hazards
Invisibility. Fine dust particles are not always visible in the air. Concentrations above the MEC (minimum explosive concentration) can exist in equipment and enclosed spaces without obvious signs.
Secondary explosions are the killer. A small primary explosion — even a contained one — sends a pressure wave through the facility, suspending settled dust on horizontal surfaces. The secondary explosion is typically 5–10 times more powerful.
Common ignition sources in food plants: hot bearings, friction from conveyor belts, static discharge during pneumatic transfer, overheated electrical equipment, welding and grinding without hot work permits.
Temperature class matters. Dust has a lower explosive limit and a layer ignition temperature — both must be checked against T-class of installed Ex equipment.
Typical Hazardous Locations
Where Dust Zones Are Found in Food Facilities
Every food processing operation is different, but the locations below appear in the majority of facilities and are frequently unclassified or incorrectly classified.
Substance Reference
Common Food Industry Dusts — Explosion Properties
The explosion class and ignition temperature of the specific dust handled determines the required equipment T-class and Ex category. Generic classifications are not sufficient.
| Substance | Explosion Class | MEC (g/m³) | Layer Ignition Temp. | Required T-class (indicative) |
|---|---|---|---|---|
| Wheat flour | St1 | ~50 | ~290°C | T3 minimum — verify per actual dust data |
| Sugar (fine) | St1 | ~30 | ~370°C | T3 minimum — check layer temp vs. T-class |
| Corn starch | St2 | ~40 | ~280°C | T3 — higher explosion index than flour |
| Cocoa powder | St1 | ~65 | ~225°C | T4 — lower layer ignition temp requires attention |
| Milk powder | St1 | ~60 | ~200°C | T4/T5 — verify: fat content affects ignition temp |
| Ground pepper / spice | St1 | ~30–80 | Variable | Verify per specific substance — wide variation |
| Instant coffee | St2 | ~85 | ~170°C | T5 or T6 — critical: very low layer ignition temp |
⚠ Values are indicative reference data. Actual explosion properties vary with particle size, moisture content, and dust composition. Always use certified test data for your specific material.
What Goes Wrong
The Most Common ATEX Failures in Food Facilities
The Service
Full ATEX Compliance for Your Food Facility
From initial site assessment through to complete documentation — a structured programme that brings your facility into compliance without disrupting production.
On-site or remote review of your facility, substances handled, and existing documentation. A clear picture of what zones are likely to exist, what equipment is at risk, and what documentation is missing.
Zone 20/21/22 classification per EN/IEC 60079-10-2 for all dust-handling areas. Zone drawings produced and integrated into the EPD. Substance explosion data assessed and documented.
Complete Explosion Protection Document prepared per Directive 1999/92/EC — including dust risk assessment, zone drawings, equipment register, and protective measures documentation.
Periodic inspection of all Ex-rated equipment in dust zones per EN/IEC 60079-17. Written inspection report with non-conformity register and recommended corrective actions.
Specification of Ex equipment appropriate for the dust zone, explosion class, and T-class required. Practical guidance for replacement of non-compliant equipment during planned maintenance.
30–60 minute video call to review your situation, answer technical questions, or provide a second opinion on classifications or equipment choices. No travel cost, available EU-wide.
Start with a free 30-minute online assessment. Describe your facility and substances — and I'll tell you what ATEX compliance scope you need and what it will cost.
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