UNECE: Globally Harmonized System (GHS) information

The UNECE Globally Harmonized System of Classification and Labelling of Chemicals (GHS) is the international framework that underpins how chemical hazards are classified and communicated using labels and Safety Data Sheets (SDS). For UK industrial sites, GHS-aligned information supports safer storage and handling, better spill response decisions, and improved environmental compliance in day-to-day operations.

This page answers common GHS questions in a practical question-and-solution format, with spill management examples for warehouses, production, labs, workshops, plant rooms, loading bays and waste areas.

Question: What is UNECE GHS and why does it matter for spill management?

Solution: Use GHS to identify hazards fast and choose correct controls

UNECE GHS provides a consistent method to classify chemical hazards (for example flammable liquids, corrosives, acute toxicity, aquatic toxicity) and communicate those hazards via:

• Label elements (pictograms, signal words, hazard statements and precautionary statements)
• SDS (the primary technical document for response, storage and disposal)

In spill management terms, this matters because the hazard classification directly influences:

• Spill kit selection (oil-only vs chemical vs general purpose absorbents)
• PPE choice (especially for corrosive and toxic substances)
• Containment strategy (drip trays, bunding, overpacks, drain protection)
• Waste handling (segregation and disposal route based on contamination and hazard)

Question: How do GHS labels help during a spill or leak?

Solution: Read the pictograms and hazard statements before you act

A GHS label is designed to be read quickly under pressure. Before absorbing, neutralising, moving containers, or blocking drains, check the label for:

• Pictograms (for example corrosive, flammable, environmental hazard)
• Signal word (Danger or Warning)
• Hazard statements (what can happen)
• Precautionary statements (what to do and what to avoid)

Operational example: A leaking drum is labelled as corrosive. The correct approach is to isolate the area, use chemical absorbents and suitable PPE, prevent the spill entering drains, and place the drum into a compatible overpack or spill pallet, rather than using general-purpose absorbents that may degrade or increase risk.

Question: Where does the SDS fit in and which sections matter most?

Solution: Build your spill response plan around the SDS

GHS is closely linked to SDS content. For spill preparedness, the SDS is the document you should use when writing site spill procedures and choosing products. The most spill-relevant sections typically include:

• Section 2 Hazards identification (GHS classification and label elements)
• Section 4 First aid measures
• Section 5 Firefighting measures (critical for flammables)
• Section 6 Accidental release measures (containment, clean-up, PPE)
• Section 7 Handling and storage (compatibility and segregation)
• Section 8 Exposure controls and PPE
• Section 13 Disposal considerations

Practical use: If Section 6 specifies preventing entry to drains and watercourses, your spill response should include drain mats or drain covers, plus an escalation route if a release threatens surface water or foul drainage.

Question: How does GHS influence the right spill kit choice?

Solution: Match spill kits and absorbents to the chemical hazard and likely volume

GHS classification supports correct spill kit selection. Typical guidance includes:

• Oil-only spill kits: for hydrocarbons (oil, diesel, hydraulic fluid). They repel water and are used where water may be present.
• Chemical spill kits: for acids, alkalis, solvents and aggressive chemicals. Use when labels/SDS indicate corrosive, toxic, oxidising or otherwise hazardous chemical properties.
• General purpose spill kits: for non-aggressive liquids such as coolants or water-based fluids, where the hazard classification and SDS confirm suitability.

Site example: In a loading bay receiving mixed chemicals, use chemical spill kits and ensure bunding and drain protection are positioned near the unloading point. In a plant room with lubricants and hydraulic oils, oil-only absorbents and drip trays are normally the first line of control.

For broader spill prevention and response planning, see spill management best practices.

Question: Does GHS replace UK legal duties for environmental protection?

Solution: Use GHS as a hazard communication tool within your compliance system

GHS is a hazard classification and communication framework. It supports your UK environmental compliance by improving the quality of on-site decisions, training and documentation, but it does not replace duties to prevent pollution and manage hazardous waste. In practice, auditors and insurers will expect to see that:

• Spill risks are assessed and controlled (bunding, spill pallets, drip trays, drain protection)
• Spill response is documented and trained
• SDS are available and current
• Waste from spills is segregated, labelled and disposed of correctly

Operational context: If a product is classified as hazardous to the aquatic environment, your controls should focus heavily on preventing drain entry, using drain covers, drain blockers, and physical containment (bunds and spill berms) around storage and transfer areas.

Question: What is the practical link between GHS and bunding, drip trays and drain protection?

Solution: Treat GHS hazards as a trigger for stronger containment and segregation

GHS labels and SDS do not just tell you what the chemical can do to people, they also hint at the consequences of release. Use them to set containment standards:

• Corrosives: use compatible drip trays and bunds, protect floors and drainage, keep neutralisers only where the SDS supports it.
• Flammables: reduce ignition sources, use absorbents safely, and consider fire-safe storage and controlled decanting.
• Oxidisers: avoid mixing with organics and incompatible absorbents, follow SDS for clean-up media.
• Environmental hazards: prioritise drain protection and rapid containment to prevent pollution incidents.

Site example: A maintenance workshop storing aerosols, solvents, oils and detergents should not rely on one generic spill kit and a mop. Use a combination of oil-only and chemical absorbents, install drip trays under dosing points, and keep drain mats near external doors and yard drains.

Question: How should we train staff using GHS information?

Solution: Build a simple label-to-action drill

Training works best when it is practical and repeated. A simple approach is:

1. Identify: read the GHS label and locate the SDS.
2. Isolate: stop work, secure the area, control ignition sources if flammable.
3. Protect: select PPE aligned with SDS guidance.
4. Contain: use bunding, drip trays, absorbent socks, and drain covers to stop spread.
5. Clean up: use the correct absorbent type and tools, avoiding incompatible materials.
6. Dispose: bag and label waste, segregate it, and follow disposal instructions.
7. Report: record the incident and restock spill kits immediately.

This label-to-action drill improves response speed and reduces errors such as using the wrong absorbent, washing residues into drains, or exposing staff to vapours.

Question: Where can we check official GHS recommendations and updates?

Solution: Use UNECE resources and keep SDS current

GHS recommendations are published and maintained through UNECE. For reference and updates, consult the UNECE GHS information pages and publications:

• UNECE - Globally Harmonized System (GHS)

On site, your most actionable and legally relevant source remains the current SDS from your supplier. Ensure SDS are accessible at point of use and included in spill response documentation.

Question: What should we do next to improve spill control using GHS?

Solution: Audit labels, SDS, spill controls and drainage protection together

A strong next step is a combined audit that checks GHS information against real-world controls:

• Are all containers correctly labelled and legible?
• Are SDS current, available and understood?
• Do spill kits match the hazards and volumes handled?
• Is bunding and secondary containment adequate for storage and transfer points?
• Are drain covers available where spills could reach drains?
• Do staff know the first actions for corrosive, flammable and environmental hazard spills?

For a broader operational framework, use Spill Management Best Practices to help structure prevention, response and continuous improvement.

Citations: UNECE - Globally Harmonized System of Classification and Labelling of Chemicals (GHS).