Why the Same Ingredient Has Different SDSs by Country

Somebody emails me a US safety data sheet and an EU one for what's supposed to be the exact same raw material, and they read almost like two different products. Different hazard statements, different classification codes, sometimes a different signal word entirely. The first reaction is usually "did I get sent the wrong document by mistake." Usually not.

The Globally Harmonized System isn't one single system

The Globally Harmonized System of Classification and Labelling of Chemicals, GHS for short, is exactly what its name says, a harmonized framework that countries adopt into their own regulations. But "adopt" doesn't mean "adopt identically." Each jurisdiction implements GHS through its own local regulation, and those implementations pick up local variations: different building blocks (sometimes called "building blocks" literally, in GHS terminology, refers to which hazard classes and categories a country has chosen to adopt), different concentration thresholds for triggering a hazard classification, and different required document formats.

So a US SDS built under US regulatory adoption of GHS and an EU SDS built under EU adoption of GHS can legitimately classify the identical substance somewhat differently, because the two frameworks aren't asking exactly the same questions.

The 16-section structure stays consistent

The good news is that the overall shape of the document doesn't change. An SDS has 16 sections regardless of which country produced it, covering everything from identification through disposal and transport information. Section 3, composition, is usually the section cosmetic formulators care about most, since that's where you find the actual ingredient breakdown and any CAS numbers.

That consistent structure is what makes it possible to compare documents across countries at all. You're not reading two unrelated formats, you're reading the same skeleton with regionally specific muscle on it.

Where the real differences show up

A few places you'll commonly see divergence between, say, a US and an EU SDS for the same substance:

• Hazard classification and signal word. A substance might trigger a "warning" classification under one region's thresholds and a "danger" classification, or no specific hazard statement at all, under another's, depending on how each region has calibrated its adoption of GHS criteria.
• Regulatory phrases and section 15 content. Section 15 (regulatory information) is almost always country-specific by design, since it's listing which local regulations apply.
• Exposure limits in section 8. Occupational exposure limits are set nationally, so a US SDS and an EU SDS may cite completely different numeric limits for handling the same substance in a workplace setting.
• Language and formatting conventions. Beyond translation, some regions have specific required formatting or additional local sections layered onto the standard 16.

Why this shouldn't spook you as a formulator

None of this means one document is wrong and the other is right, or that your supplier sent you inconsistent paperwork by mistake. It reflects that GHS is a framework for harmonization, not a single global rulebook, and each region's regulators have made their own calibration choices within it.

What it does mean practically:

1. Always pull the SDS relevant to the market you're selling into, not whichever version happens to be attached to an old email thread. A US-market SDS is the wrong reference document if you're filing a notification in Canada or the EU.
2. Don't cross-reference hazard classifications across countries as if they're interchangeable data points. A "no significant hazard" classification in one region's SDS doesn't automatically confirm the same for another region's framework.
3. Section 3 composition data is usually your most stable anchor. Ingredient identity and CAS numbers tend to be far more consistent across regional SDS versions than the hazard classification language surrounding them.

The practical habit worth building

When you're sourcing an ingredient for a specific market, request or confirm the SDS version relevant to that market specifically, rather than assuming any SDS from the supplier will do. If your supplier only provides one version, ask which regulatory framework it was built under, and treat any hazard classification language with the understanding that it may not transfer directly to a different market's expectations.

For the ingredient identity itself, the INCI name and CAS number pulled from Section 3, Cosmetic Comply uses that as the anchor point regardless of which country's SDS format it came from, mapping it consistently to the right entry for your Canadian filing so the regional quirks in hazard classification language don't end up muddying what actually needs to go on your Cosmetic Notification Form.