# Class 2 Gases

*Last updated: 2026-06-26*

> A freight forwarder collects propane cylinders from a client – and Class 2 dangerous goods regulations apply immediately.

A freight forwarder collects propane cylinders from a client – and Class 2 dangerous goods regulations apply immediately. The class covers all gases that are carried compressed, liquefied, or refrigerated, divided into three divisions: 2.1 (flammable gases such as propane or hydrogen), 2.2 (non-flammable, non-toxic gases such as nitrogen or compressed air), and 2.3 (toxic gases such as chlorine or ammonia). Each division has its own packaging specifications, pressure-vessel inspection intervals, and vehicle ventilation requirements. Air transport imposes strict quantity limits or outright prohibitions for many gases, particularly flammable and toxic ones; sea transport is governed by the IMDG Code with regard to stowage and segregation. Missing pressure-test certificates or incorrect hazard labels will result in the carrier refusing the consignment.

**Source:** [https://www.imo.org/en/OurWork/Safety/Pages/DangerousGoods.aspx](https://www.imo.org/en/OurWork/Safety/Pages/DangerousGoods.aspx)

## Quick Facts

| Property | Value |
|---|---|
| Term | Class 2 Gases |
| Language | EN |
| Word count | 121 |
| Last updated | 2026-06-26 |
| Source | https://www.imo.org/en/OurWork/Safety/Pages/DangerousGoods.aspx |

---

*Logistics Glossary — Freight Academy: [https://www.freight-academy.com/en/glossary/class-2-gases](https://www.freight-academy.com/en/glossary/class-2-gases)*

*Markdown mirror: [https://www.freight-academy.com/api/md/glossary/en/class-2-gases](https://www.freight-academy.com/api/md/glossary/en/class-2-gases)*

*JSON summary: [https://www.freight-academy.com/api/v1/glossary/class-2-gases/llm-summary?lang=en](https://www.freight-academy.com/api/v1/glossary/class-2-gases/llm-summary?lang=en)*