Walk into any safety equipment supplier's catalogue and you will find chemical stores, COSHH cabinets, and flammable cabinets listed side by side — often with similar-looking photographs. Many buyers choose the wrong product, either over-specifying (wasting budget) or under-specifying (creating a compliance gap). This guide provides a definitive breakdown of each product type, the regulations that govern their use, and a decision framework to help you choose correctly.
The Three Product Types — Defined
1. Chemical Store (COSHH Store / Outdoor Hazardous Chemical Store)
A chemical store (often called a COSHH store) is a standalone, usually external, ventilated storage unit designed for general hazardous chemicals. Key characteristics:
- Ventilation: Passive or mechanical ventilation as standard to prevent vapour build-up
- Secondary containment: Integral sump to contain spills — typically 110% of the largest container
- Capacity: Large — from 200L to over 2,000L, suitable for drums, IBCs, and multiple containers
- Fire rating: NOT typically fire-rated to BS EN 14470-1. Designed for chemical segregation and containment, not fire resistance
- Regulation: COSHH Regulations 2002, EA PPG26 (drum and IBC storage)
- Best for: Pesticides, lubricants, cleaning chemicals, acids, alkalis — general hazardous substance storage
2. Flammable Cabinet (Fire-Rated Safety Cabinet)
A flammable cabinet is a fire-rated enclosure specifically engineered to resist fire and slow the spread of ignition from flammable liquids stored within. Key characteristics:
- Fire resistance: Certified to BS EN 14470-1 — either Type 1 (15-minute fire resistance) or Type 2 (10-minute)
- DSEAR compliance: Required where flammable liquids classified H224, H225, or H226 are stored in a workplace
- Capacity: Limited to 250 litres maximum under BS EN 14470-1 for single cabinets
- Self-closing doors: Mandatory — spring-loaded to close automatically in a fire
- Grounding: Earthing points for anti-static protection
- Regulation: DSEAR 2002, BS EN 14470-1, HSE Dangerous Substances guidance
- Best for: Solvents, acetone, IPA, cellulose thinners, flammable aerosols
3. COSHH Cabinet (Under-Bench / Small Quantity)
The term "COSHH cabinet" is widely misused. In practice, it refers to smaller, under-bench storage units designed for small quantities of hazardous substances, typically in laboratory, workshop, or cleaning cupboard environments. Key characteristics:
- Capacity: Typically 30–100 litres
- Fire rating: NOT fire-rated — designed for chemical organisation and access control, not fire protection
- Ventilation: Usually passive venting via bung that can be opened
- Regulation: COSHH Regulations 2002 (general duty of adequate storage)
- Best for: Cleaning products, small volumes of acids/alkalis, workshop chemicals below DSEAR thresholds
Comparison Table: Which Cabinet Do You Need?
| Feature | Chemical Store (COSHH Store) | Flammable Cabinet (BS EN 14470-1) | COSHH Cabinet (Under-Bench) |
|---|---|---|---|
| Fire Rating | None | 15 min (Type 1) or 10 min (Type 2) | None |
| Typical Capacity | 200 L – 2,000+ L | Up to 250 L | 30 – 100 L |
| Secondary Containment | Yes — integral sump | Yes — internal sump tray | Partial — tray only |
| Ventilation | Yes — passive or forced | Yes — passive venting with flame arrestors | Passive (optional) |
| Key Regulation | COSHH 2002, PPG26 | DSEAR 2002, BS EN 14470-1 | COSHH 2002 |
| Location | External / dedicated store room | Internal workplace | Under workbench / cupboard |
| Suitable for Flammables (DSEAR)? | Only if flammables are minor content | Yes — primary purpose | No |
| Self-Closing Doors | No | Yes — mandatory | No |
The Decision Framework
Storing flammable liquids (H224/H225/H226) in a workplace? → You need a BS EN 14470-1 certified flammable cabinet. DSEAR 2002 requires it.
Storing large quantities of general hazardous chemicals externally? → You need a chemical store (COSHH store) with integral bund and ventilation.
Small volumes of cleaning products or workshop chemicals under a bench? → A COSHH under-bench cabinet is appropriate, provided the chemicals are not classified as flammable.
Common Mistakes
The most dangerous error is storing flammable solvents in a non-fire-rated COSHH store. In a fire, an unrated cabinet provides no meaningful protection — the contents will fuel and accelerate the blaze. Always check GHS hazard classifications on your SDS before choosing storage.
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