If your business generates dust from wood, grain, flour, metal, plastic, or other combustible materials, you’re operating in an environment that UK law takes very seriously. Combustible dust isn’t just a housekeeping issue — under the right (or rather, wrong) conditions, it can fuel a fire or explosion. That’s where ATEX and DSEAR come in.
For many manufacturers, engineers, and facilities managers, these terms are familiar, but the detail is fuzzy. Here’s a straightforward guide to what they mean, who they apply to, and what it means for the equipment — including industrial vacuums — you use to manage dust on site.
What Is ATEX?
ATEX takes its name from the French term Atmosphères Explosibles. It refers to the European regulatory framework governing equipment and protective systems used in potentially explosive atmospheres — anywhere flammable gases, vapours, or combustible dust could mix with air and ignite.
ATEX covers two things:
- Equipment, through what’s often called ATEX 114 — the rules manufacturers must follow when designing, certifying, and selling equipment for use in hazardous areas.
- Workplaces, through what’s often called ATEX 137 — the requirements employers must follow to protect workers where explosive atmospheres may occur.
Following Brexit, Great Britain now applies its own UK ATEX Regulations rather than the EU directive directly, though the requirements are closely aligned. Northern Ireland continues to follow the EU ATEX rules in full under the Windsor Framework. In practice, equipment already certified under EU ATEX can still be sold and used across the UK without needing separate certification.
What Is DSEAR?
DSEAR — the Dangerous Substances and Explosive Atmospheres Regulations — is the UK’s worker-protection side of this framework, in place since 2002. It’s essentially the practical, on-the-ground application of ATEX 137 for British workplaces.
Under DSEAR, employers must:
- Assess the risks posed by dangerous substances, including combustible dusts
- Eliminate or reduce those risks wherever reasonably practicable
- Have procedures and equipment in place to deal with accidents and emergencies
- Classify hazardous areas into zones and mark them appropriately
- Provide staff with the right information, instruction, and training
DSEAR applies broadly — to flammable liquids and gases, but also to combustible dusts such as flour, wood dust, and certain metal powders. If your process generates fine particulate from an organic or metallic material, it’s worth assuming DSEAR applies until a proper risk assessment says otherwise.
Understanding Hazard Zones
The centrepiece of DSEAR compliance is hazardous area classification — mapping out where an explosive atmosphere could realistically form, and how often.
For dust environments, the zones are:
- Zone 20 — Explosive dust atmosphere present continuously or for long periods
- Zone 21 — Explosive dust atmosphere likely to occur occasionally during normal operation
- Zone 22 — Explosive dust atmosphere not likely in normal operation, and if it does occur, only briefly
(Gas and vapour atmospheres have their own equivalent zones — 0, 1, and 2 — but for most dust-handling businesses, it’s the 20/21/22 classification that matters.)
Once a zone is identified, any equipment used within it — including extraction and vacuum systems — must be certified suitable for that zone. This is where ATEX-rated equipment becomes essential rather than optional.
Which Industries Does This Affect?
If your business falls into any of these categories, ATEX and DSEAR are very likely relevant to you:
- Food and grain processing — flour, sugar, and grain dust are all classified as combustible dusts
- Woodworking and joinery — sawdust and wood chippings
- Metalworking and foundries — fine metal powders and swarf, particularly aluminium and magnesium
- Pharmaceutical manufacturing — powder handling during production
- Chemical processing — a wide range of flammable and reactive substances
- Cement, brick, and ceramics — fine mineral and silica dust
- Plastics and rubber — polymer dust generated during cutting, grinding, or moulding
This list isn’t exhaustive. If your process involves cutting, grinding, sanding, milling, or moving fine powders and particles, it’s worth having your site assessed.
What This Means for Your Equipment Choices
If a zone assessment identifies hazardous areas on your site, standard equipment simply isn’t suitable — even if it “seems fine” day to day. ATEX-rated industrial vacuums and extraction units are engineered specifically to eliminate ignition sources: sealed motors, anti-static components, controlled surface temperatures, and earthing systems designed to prevent the exact spark or heat source that could turn dust into a hazard.
This is a legal requirement, not a nice-to-have. Non-compliant equipment used in a classified zone puts your business at risk of both a genuine safety incident and enforcement action from the HSE.
Getting It Right
The starting point is always a proper DSEAR risk assessment carried out by a competent person — this determines whether hazardous zones exist on your site and, if so, how they’re classified. From there, equipment, procedures, and training all need to align with the zones identified.
If dust is part of your daily operation and you’re not confident your extraction and vacuum equipment meets current ATEX requirements, it’s worth getting it checked. Apollo Industrial Supplies works with businesses across a wide range of industries to specify the right ATEX-rated vacuum solution for the zones and materials involved — get in touch for a no-obligation site survey, and we’ll help you get it right.