Help prevent incidents associated with all combustible dusts and particulate solids with this all-in-one resource of related requirements.
NFPA 660, Standard for Combustible Dusts and Particulate Solids, provides safety requirements for all combustible dusts and particulate solids to help prevent injuries and fatalities from associated hazards.
This standard consolidates the requirements of six previous standards—NFPA 652, Standard on the Fundamentals of Combustible Dust; NFPA 61, Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food Processing Facilities; NFPA 484, Standard for Combustible Metals; NFPA 655, Standard for Prevention of Sulfur Fires and Explosions; NFPA 664, Standard for the Prevention of Fires and Explosions in Wood Processing and Woodworking Facilities; and NFPA 654, Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing, and Handling of Combustible Particulate Solids.
The 2025 edition of NFPA 660, Standard for Combustible Dusts and Particulate Solids, features several updates, including:
- Definitions for the terms transient releases, management of change, operational readiness review, and explosive- and propellant-actuated devices
- Additional requirements for operational readiness reviews
- New requirements to evaluate self heating, thermal instability, water reactivity, and chemical reactivity hazards
- Additional language to address the level of protection provided by flame-resistant garments
- Additional information about who is qualified to perform a DHA
- Revisions to clarify the requirements for bonding and grounding of housekeeping equipment
- Updates to resistance limits for flexible connectors and additive manufacturing requirements
- New test standards for portable vacuum cleaners used with combustible metals.
