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 157

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ERG 2024 ID 2578ERG identification number: 2578. Material: Phosphorus trioxide. Assigned response guide: Guide 157, Substances - Toxic and/or Corrosive (Non-Combustible/Water-Sensitive). 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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