GHS Pictograms and Hazard Statements: A Buyer's Guide for Chemists and Biotech Teams

GHS (Globally Harmonised System) pictograms and hazard statements are essential for safe handling, storage, and transport of chemicals in research, biotech, and pharmaceutical workflows. Each pictogram corresponds to a specific hazard class—such as flammability, toxicity, or corrosivity—and is paired with a standardised hazard statement (e.g., H225 for flammable liquids). These are mandated under REACH (EU), TSCA (US), and international GHS frameworks. Signal words—'Danger' or 'Warning'—indicate severity. Buyers must verify that Safety Data Sheets (SDS) and Certificates of Analysis (CoA) include compliant GHS labels and statements, particularly for regulated substances like solvents, reagents, and intermediates.

What are the GHS pictograms and how are they used?

The GHS employs 9 pictograms, each representing a distinct hazard class. These are mandatory on labels for hazardous chemicals under REACH, TSCA, and GHS-aligned regulations. The pictograms are black symbols on a white background with a red diamond border. Key examples include:

• Flame (H225, H226): Flammable liquids and gases.
• Skull and crossbones (H300–H312): Acute toxicity.
• Corrosion (H290–H292): Skin and eye corrosion.
• Exclamation mark (H315–H319): Skin/eye irritation, sensitisation.
• Health hazard (H304, H314): Carcinogenicity, mutagenicity, reproductive toxicity.

Pictograms are used in conjunction with hazard statements and signal words. For example, a flammable solvent must display the flame pictogram, the signal word 'Danger', and hazard statements such as H225 (highly flammable liquid) and H315 (causes skin irritation).

How do hazard statements differ from precautionary statements?

Hazard statements (e.g., H225, H302) describe the nature and degree of the hazard posed by a substance. Precautionary statements (P101–P501) provide guidance on safe handling, storage, and emergency response. They are distinct but complementary.

For example, a reagent with H314 (causes severe skin burns and eye damage) must be accompanied by:

• Precautionary statement P280: Wear protective gloves/protective clothing/eye protection/face protection.
• P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Hazard statements are standardised and assigned by regulatory bodies based on testing data or classification criteria. Precautionary statements are selected from a predefined list in the GHS Annex 10. Both must appear on SDS and labels.

Are GHS requirements the same across all regions?

No. While GHS is harmonised globally, implementation varies by region. Key differences include:

• EU (REACH/CLP): Uses the full GHS framework with 9 pictograms. Hazard statements are assigned under Regulation (EC) No 1272/2008 (CLP). Signal words are 'Danger' (severe) and 'Warning' (less severe).
• USA (TSCA, OSHA): Aligns with GHS but retains some legacy terms. For example, 'Flammable' is used instead of 'H225' in some contexts. The Hazard Communication Standard (HCS) requires pictograms, signal words, and hazard statements on labels.
• Canada (WHMIS 2015): Fully aligned with GHS. Uses the same pictograms and hazard statements as the EU.
• Japan (JIS): Adopts GHS but with some modifications in classification thresholds.

Buyers must verify that suppliers comply with the specific regulatory framework of their jurisdiction. For instance, a chemical imported into the UK post-Brexit must comply with UK REACH, which mirrors EU CLP but with independent enforcement.

How can buyers verify GHS compliance in chemical procurement?

Buyers should verify GHS compliance through the following steps:

1. Check the SDS: Ensure it includes the full GHS label elements: pictograms, signal word, hazard statements, and precautionary statements.
2. Review the CoA: Confirm that the product’s classification matches the SDS and that it includes GHS hazard codes.
3. Validate the label: Physical labels must display the correct pictograms and text in the required language (e.g., English for UK/EU).
4. Use trusted suppliers: Reputable suppliers like Molekula provide SDS and CoA documents that are GHS-compliant and updated per regulatory changes.
5. Cross-reference with databases: Use the ECHA Classification and Labelling Inventory (https://echa.europa.eu/cl-inventory) to verify EU CLP classification.

For high-risk substances (e.g., carcinogens, mutagens), ensure that the hazard statement includes the appropriate EU CLP or GHS code (e.g., H350 for carcinogenicity).

What are the consequences of non-compliance?

Non-compliance with GHS regulations can result in:

• Fines and penalties: Under UK REACH, non-compliance can lead to fines up to £50,000 per violation.
• Supply chain disruption: Customs or regulatory authorities may reject shipments lacking compliant labels or SDS.
• Safety incidents: Mislabelled chemicals increase the risk of exposure, fire, or environmental harm.
• Legal liability: In case of injury or environmental damage, non-compliance may be used as evidence of negligence.

For example, a laboratory using a solvent misclassified as non-flammable could face a fire hazard if stored near ignition sources.

Sources

• European Chemicals Agency (ECHA). Classification and Labelling Inventory. https://echa.europa.eu/cl-inventory
• U.S. Occupational Safety and Health Administration (OSHA). Hazard Communication Standard (29 CFR 1910.1200). https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1200
• UK Health and Safety Executive (HSE). UK REACH. https://www.hse.gov.uk/chemicals/uk-reach.htm
• United Nations. Globally Harmonised System of Classification and Labelling of Chemicals (GHS). https://www.unece.org/transport/documents/2021/01/12/UN_GHS_Rev_9_E.pdf

Frequently asked

• What is the difference between GHS and REACH? REACH is a European Union regulation for chemical registration, evaluation, authorisation, and restriction. GHS is a global system for classifying and labelling chemicals. REACH incorporates GHS for labelling and safety communication.

• Do all chemicals need GHS pictograms? Only chemicals classified as hazardous under GHS criteria require pictograms. Non-hazardous substances do not.

• Can a chemical have multiple hazard statements? Yes. A substance may have multiple hazard statements if it poses more than one type of hazard (e.g., H314 and H318 for corrosive and severe eye damage).

• How often are GHS classifications updated? Updates occur periodically based on new scientific data or regulatory changes. Suppliers should notify customers of significant changes. ECHA updates the CLP inventory regularly.