# Class 4 Dangerous Goods Transport

*Last updated: 2026-06-23*

> Unlike flammable liquids in Class 3, Class 4 dangerous goods split into three divisions with distinct hazard profiles.

Unlike flammable liquids in Class 3, Class 4 dangerous goods split into three divisions with distinct hazard profiles. Division 4.1 covers flammable solids such as sulphur and charcoal; Division 4.2 addresses substances liable to spontaneous combustion, including white phosphorus; Division 4.3 captures water-reactive materials like sodium and calcium carbide that release flammable gases on contact with moisture. That sensitivity to water makes Division 4.3 particularly demanding in sea freight, where humidity control must be maintained throughout the voyage. Freight forwarders and shippers must apply the relevant modal regulation—ADR (road), RID (rail), IMDG Code (sea), or IATA DGR (air)—each specifying different packing groups, quantity thresholds, and labelling obligations. Segregation from incompatible cargo and, for certain substances, temperature-controlled transport units are mandatory.

**Source:** [https://en.wikipedia.org/wiki/Dangerous_goods#Class_4](https://en.wikipedia.org/wiki/Dangerous_goods#Class_4)

## Quick Facts

| Property | Value |
|---|---|
| Term | Class 4 Dangerous Goods Transport |
| Language | EN |
| Word count | 120 |
| Last updated | 2026-06-23 |
| Source | https://en.wikipedia.org/wiki/Dangerous_goods#Class_4 |

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