ERG2024 supports first responders during the initial phase of a hazardous-materials transportation incident. It is not controlling regulation, a compliance determination, a chemical-specific worker safety document, or a substitute for required shipping-paper emergency-response information.

ERG2024 navigationUse the complete official guide during an incident

Open Guide 138

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ERG 2024 ID 1407ERG identification number: 1407. Material: Caesium. Assigned response guide: Guide 138, Substances - Water-Reactive (Emitting Flammable Gases). The ERG index does not mark this entry with the P polymerization-hazard indicator.#

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Retrieved: Aug 13, 2026
Version: 2024 edition (2024-04-04)

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