SDS Section 2 Across HazCom, WHMIS, and CLP: What Reviewers Need to Recheck

Section 2 is easy to locate in an SDS, but it is also prone to being copied incorrectly.

The United States, Canada, and the European Union all use GHS-based hazard communication systems. Each requires Section 2 to address product classification and hazard communication, but classification rules, supplemental requirements, and treatment of other hazards differ.

As a result, a Section 2 that is correct for one market may not be correct for another.

Do not treat Section 2 as a translation task. Start with the classification required for the target market and develop Section 2 content based on that classification.

What goes in SDS Section 2?

Section 2 is the hazard identification section of the safety data sheet. It links the classification decision to the information presented to the reader.

Across the three systems, it generally covers:

• the hazard classification of the product

• the applicable pictograms or symbols

• the signal word, where required

• hazard statements

• precautionary statements

• additional or other hazard information required by the jurisdiction

While the structure is similar across markets, reviewers should pay close attention to the specific details.

Section 2 requirements at a glance

Start with the classification, not the wording

The most common Section 2 error occurs before drafting the section itself. If the classification is incorrect, the signal word, pictograms, hazard statements, and precautionary statements will also be incorrect. Revising the wording without verifying the classification only improves appearance, not accuracy.

Under OSHA HCS, chemical manufacturers and importers must classify the chemical first, and Appendix D then tells the preparer what hazard information belongs in Section 2.

The same logic applies in Canada and the EU. WHMIS Section 2 is built from the HPR classification. EU Section 2 is built from the CLP classification.

For the classification side of the workflow, see Valenc's GHS classification page.

United States: Section 2 now carries more than the shipped label

Under OSHA HCS, Section 2 must show the chemical classification and the required hazard communication elements, including the signal word, hazard statements, symbols, and precautionary statements.

It must also describe hazards not otherwise classified.

HCS 2024 adds an important point. OSHA clarified that certain hazards associated with a chemical's intrinsic properties, including chemical reaction products associated with known or reasonably anticipated uses or applications, must be classified and included in Section 2 of the SDS. OSHA also clarified that those hazards are not automatically required on the shipped-container label. The distinction is set out in 29 CFR 1910.1200(d)(1)(ii) and (f)(1).

Reviewers should not assume that Section 2 and the shipped label are always identical.

Valenc already has a separate HCS 2024 checklist for the broader U.S. update. For Section 2, the main job is to make sure the current classification and the hazard information shown on the SDS still agree.

Canada: Section 2 includes other known hazards

Canadian WHMIS follows the same broad GHS structure, but the HPR has its own required information elements.

HPR Schedule 1, item 2 lists the Section 2 elements: classification, symbols, signal word, hazard statements, precautionary statements, supplemental label elements where applicable, and other hazards known to the supplier.

This is important: Section 2 must include not only the main hazard classification but also any other hazards known to the supplier.

Common issues include incomplete classifications, missing symbols, duplicate signal words, and statements copied with unresolved options.

For Canadian compliance, Section 2 is not complete solely because the main hazard class is correct. All communication elements must be complete and internally consistent.

European Union: Section 2 has a separate "other hazards" job

EU Section 2 is organized under REACH Annex II, while the classification and label elements come from CLP.

REACH Annex II divides the section into three parts: classification of the substance or mixture, label elements, and other hazards.

Section 2.1 gives the CLP classification. Section 2.2 gives the label elements. Section 2.3 captures other hazard information that is relevant to the SDS.

EU-specific review is essential here. Section 2.3 must indicate whether the substance meets PBT or vPvB criteria or has endocrine-disrupting properties, as required by REACH.

The EU has introduced new CLP hazard classes for endocrine disruption, PBT/vPvB, and PMT/vPvM. Transition dates are set in CLP as amended by Regulation (EU) 2023/707: mixtures from May 1, 2026, and mixtures already on the market before then until May 1, 2028. Reviewers must ensure products are assessed using current CLP criteria.

Five Section 2 mistakes that are easy to miss

1. Copying the supplier SDS without checking your own classification

A supplier SDS can be an important source document. It is not automatically the final classification for your product, especially when you are formulating a mixture or placing the product on a different market.

2. Updating the classification but leaving old hazard statements behind

A classification change should trigger a full Section 2 review. Do not update the category and assume the old signal word, pictograms, or statements still apply.

3. Treating the SDS and label as identical in every situation

They are closely connected, but some jurisdictions require information in Section 2 that does not appear on the shipped label. OSHA's HCS 2024 clarification is a good example.

4. Assuming "not classified" means there are no other hazards to disclose

Canada, the U.S., and the EU each have ways of capturing hazard information outside the main classification result. Review those requirements separately.

5. Reusing one regional Section 2 in another market

The product may remain unchanged, but classification rules and other hazard requirements may differ by market. Translate the product data, not the regulatory outcome.

A practical Section 2 review before publication

• Confirm the target jurisdiction before reviewing the section.

• Check the current classification under that jurisdiction's rules.

• Make sure every hazard class and category shown in Section 2 matches the approved classification.

• Recheck the pictograms or symbols, signal word, hazard statements, and precautionary statements.

• Remove obsolete statements that belonged to an earlier classification.

• Check the jurisdiction's other-hazard requirements instead of assuming the classification tells the whole story.

• Compare Section 2 with the shipped label, but do not assume they must always be identical.

• Check that the language and terminology are correct for the target market.

• Record the regulatory basis and revision used for the decision so another reviewer can reproduce it.

If any of these steps are unclear, the Section 2 review is incomplete.

Section 2 should be generated from the classification decision, not maintained as a separate block of text

Managing classification, Section 2, and label content as separate documents increases the risk of inconsistencies.

A better workflow uses the classification as the source decision. Once approved, Section 2 and related label elements should be generated from the same product record for the target jurisdiction.

This approach underpins Valenc's SDS authoring workflow. When a classification or regulation changes, the affected SDS content should be reviewed, rather than relying on someone to notice outdated information.

The same logic applies to ongoing updates. Valenc's regulatory monitoring workflow links regulatory changes to the relevant products and SDS sections that require review.

Section 2 is brief, but the work behind it is substantial. The objective is to ensure the information presented is accurate for the classification, market, and applicable regulations.