GHS, CLP, and OSHA HazCom: The Same Rules in Three Different Accents
If you sell into the EU, the US, the UK and the GCC, you will encounter four different hazard communication regimes that mostly — but not entirely — agree. This guide explains how to read them together and avoid duplicate work.
One global framework, many local implementations
The Globally Harmonized System (GHS) is a United Nations-level recommendation, published as the 'Purple Book' and revised every two years. It is explicitly a 'building block' framework: each jurisdiction picks which classification categories, hazard classes, and label elements to adopt, and which to defer. That is why a product can carry technically correct, technically 'GHS-aligned' labels in the EU, the US, the UK and Saudi Arabia that nonetheless look meaningfully different from each other.
Understanding this is the foundation for any multi-market documentation strategy. The mistake is to treat one jurisdiction's label as the global label.
The EU: CLP
Regulation (EC) No 1272/2008 (CLP) implements GHS in the EU. CLP is updated through Adaptation to Technical Progress (ATP) revisions on the EU's own schedule, typically one or two ATPs per year, each introducing new harmonised classifications or refining hazard class criteria.
Notable CLP-specific features: harmonised classifications for many substances (Annex VI Table 3.1), the EUH supplemental hazard statements, and the requirement for poison-centre notification (PCN) via the ECHA portal for products supplied to consumers or professional users.
The UK: GB-CLP and NI-CLP
Since 1 January 2021, Great Britain (England, Scotland, Wales) has operated its own GB-CLP regime, administered by the HSE. GB-CLP began as a copy of EU CLP but is now diverging — both regimes will accept ATPs at different times, and the GB Mandatory Classification and Labelling (MCL) list will not mirror the EU's Annex VI Table 3.1 indefinitely.
Northern Ireland continues to operate under EU CLP under the terms of the Windsor Framework. A product placed on the market across the UK may therefore need parallel GB and NI labelling, with both UK and EU/EEA supplier addresses where applicable.
The US: OSHA HazCom 2012 (and the 2024 update)
In the United States, 29 CFR 1910.1200 — known as the Hazard Communication Standard, or HazCom — was substantially aligned with GHS in 2012. In 2024, OSHA published an update aligning HazCom more closely with GHS Revision 7 and introducing additional clarifications. The deadlines for compliance with the 2024 update phase in across 2026 and 2027.
Notable US-specific features: 'hazards not otherwise classified' (HNOC) is recognised, certain concentration cut-offs differ from CLP (skin and eye irritation in particular), and the US has its own conventions for trade-secret disclosure under 29 CFR 1910.1200(i).
The GCC: GSO GHS and SFDA
The Gulf Cooperation Council (GCC) has adopted GSO 2430 as the regional GHS-aligned regulation. Each member state administers chemical and consumer-product compliance through its own authority — most prominently the SFDA in Saudi Arabia, ESMA in the UAE, and SASO for general product standards.
Arabic-language documentation is, in practice, a hard requirement for SFDA acceptance. Auto-translated SDS routinely fail SFDA review; the expectation is documentation authored in Arabic with technical accuracy preserved, not English-to-Arabic machine translation.
The differences that bite in practice
Concentration cut-offs for skin and eye irritation, aspiration toxicity, and certain sensitisers differ between CLP and OSHA HazCom — meaning a mixture can be classified differently in the two jurisdictions despite both being 'GHS-aligned.'
The EU's harmonised classification list (Annex VI Table 3.1) and the US's lack of an equivalent mandatory list means classifications can legitimately differ for the same substance.
Transport classification (ADR/RID/IMDG/IATA) is a separate framework from supply classification (CLP/HazCom/GSO) and answers a different question. They overlap substantially but they are not interchangeable.
A practical multi-market authoring approach
Author the EU CLP version first as the master — it is typically the strictest, the most stable, and the best-documented in terms of public guidance. Derive the GB-CLP, OSHA HazCom and GSO/SFDA variants from that master rather than maintaining four parallel originals.
Maintain a single source-of-truth classification table per product, mapping each hazard class to its CLP, GB-CLP, HazCom, and GSO classification. Update the table on every formula change, every ATP, every HazCom revision, and every GSO update. This single table is what makes multi-market authoring scalable.