GHS Hazard Classification Basics
The Globally Harmonized System (GHS) provides a structured approach to classifying chemical hazards and communicating them through labels and SDS documents. Classification depends on substance data, test results, and jurisdiction-specific adoption rules.
By Enthovion Editorial Team · Published 2026-07-10 · Updated 2026-07-21
Key takeaways
- GHS organizes hazards into physical, health, and environmental classes.
- Classification drives hazard statements, pictograms, and precautionary statements.
- Jurisdiction adoption affects how GHS is applied.
- Qualified review is required for classification decisions.
Hazard classes and categories
GHS uses hazard classes (such as flammable liquids or skin corrosion) and categories to express severity. Classification should be supported by reliable data.
From classification to SDS and labels
Classification outputs inform SDS Section 2 and labeling elements. Inconsistent classification assumptions are a common source of SDS review findings.
Practical example
A reviewer compares GHS classification inputs for a solvent against available flash point data and internal classification rules before approving SDS Section 2.
Limitations
- GHS adoption and thresholds vary by country.
- Classification requires valid data and expert interpretation.
- Software can assist but does not replace qualified classification review.