NFPA 400:2025

1.1 Scope. 1.2 Purpose. 1.3 Application. 1.4 Retroactivity. 1.5 Equivalency. 1.6 Units and Formulas. 1.7 Enforcement. 1.8 Permits. 1.9 Facility Closure. 1.10 Emergency Planning. 1.11 Hazardous Materials Management Plan (HMMP). 1.12 Hazardous Materials Inventory Statement (HMIS). 1.13 Plan Review. 1.14 Technical Assistance. Chapter 2 Referenced Publications 2.1 General. 2.2 NFPA Publications. 2.3 Other Publications. 2.4 References for Extracts in Mandatory Sections. Chapter 3 Definitions 3.1 General. 3.2 NFPA Official Definitions. 3.3 General Definitions. 3.4 Special Performance-Based Definitions. Chapter 4 Classification of Materials, Wastes, and Hazard of Contents 4.1 Hazardous Material Classification. 4.2 Classification of High-Hazard Contents. 4.3 Mixtures. 4.4 Multiple Hazards.

This code shall apply to the storage, use, and handling of the following hazardous materials in all occu‐ pancies and facilities: (1) Ammonium nitrate solids and liquids (2) Corrosive solids and liquids (3) Flammable solids (4) Organic peroxide formulations (5) Oxidizer — solids and liquids (6) Pyrophoric solids and liquids (7) Toxic and highly toxic solids and liquids (8) Unstable (reactive) solids and liquids (9) Water-reactive solids and liquids (10)* Compressed gases and cryogenic …uids as included within the context of NFPA 55