DSEAR and COSHH: What's the Difference for Chemical Storage Compliance

DSEAR and COSHH get mentioned in the same breath so often that many businesses assume they're two names for the same requirement. They're not, and mixing them up can leave a genuine compliance gap even when a business believes it's fully covered.

COSHH: Substances Hazardous to Health

The Control of Substances Hazardous to Health Regulations 2002 cover exposure to substances that can harm health: irritants, toxic chemicals, and materials that cause illness through contact, inhalation or ingestion. COSHH is primarily about protecting people from harmful exposure over time, whether that's a single high dose or repeated low-level contact.

DSEAR: Dangerous Substances and Explosive Atmospheres

The Dangerous Substances and Explosive Atmospheres Regulations 2002 cover a different risk entirely: substances that can cause fire, explosion or a dangerously reactive atmosphere. DSEAR is concerned with the substance's potential to ignite or explode, not with the health effects of exposure. A chemical can fall under DSEAR, COSHH, both, or neither, depending entirely on its properties.

Why the Overlap Causes Confusion

Plenty of substances, solvents and certain cleaning chemicals among them, trigger both sets of regulations simultaneously: hazardous to health under COSHH, and a fire or explosion risk under DSEAR. Treating that kind of substance as only a COSHH issue (or only a DSEAR one) means addressing half the actual risk.

What This Means for Storage Choices

The practical upshot is that chemical storage needs to be assessed against both frameworks separately, not treated as a single generic "hazardous substances" category. Storage that adequately contains a health hazard under COSHH won't necessarily address ignition risk under DSEAR, and vice versa. Our guide to choosing the right COSHH cabinet and IronStor's range of COSHH and hazard cabinets cover containment for hazardous substances specifically; a DSEAR assessment may point to additional measures around ignition sources, ventilation and segregation that sit outside what a cabinet alone provides.

Getting the Assessment Right First

Because the correct storage approach depends entirely on which regulations actually apply, the useful starting point is a proper assessment of what's being stored, not a default "get a cabinet" response. A DSEAR risk assessment and a COSHH assessment ask genuinely different questions, and a substance that needs both deserves both.

Where This Fits With Wider Equipment Compliance

Chemical storage compliance sits alongside, rather than instead of, the general duties covering the racking and shelving supporting it. Our guide to PUWER compliance for shelving and racking covers those separate obligations.

Final Thoughts

DSEAR and COSHH aren't interchangeable, and treating them as one requirement is the most common way a genuine gap gets missed. Assess against both, and choose storage that actually addresses what each one is concerned with.

If you're not sure which rules apply to what you're storing, our team can help you think it through. Call us: 01782 770100, Email: info@ironstor.co.uk or fill in the form here and one of our team will be in touch.