Chapter 64 — PYROPHORIC MATERIALS
Section 6404
California Fire Code (Title 24, Part 9) · 2022 edition · updated 2026-09-10 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
6404.1 Indoor storage.¶
Indoor storage of pyrophoric materials in amounts exceeding the maximum allowable quantity per control area indicated in Table 5003.1.1(1) shall be in accordance with Sections 5001, 5003 and 5004 and this chapter.
The storage of silane gas, and gas mixtures with a silane concentration of 1.37 percent or more by volume, shall be in accordance with ANSI/CGA G-13.
6404.1.1 Liquid-tight floor. In addition to the requirements of Section 5004.12, floors of storage areas containing pyrophoric liquids shall be of liquid-tight construction.
6404.1.2 Pyrophoric solids and liquids. Storage of pyrophoric solids and liquids shall be limited to a maximum area of 100 square feet (9.3 m 2 ) per pile. Storage shall not exceed 5 feet (1524 mm) in height. Individual containers shall not be stacked.
Aisles between storage piles shall be not less than 10 feet (3048 mm) in width.
Individual tanks or containers shall not exceed 500 gallons (1893 L) in capacity.
6404.1.3 Pyrophoric gases. Storage of pyrophoric gases shall be in detached buildings where required by Section 5003.8.2.
6404.1.4 Separation from incompatible materials. In addition to the requirements of Section 5003.9.8, indoor storage of pyrophoric materials shall be isolated from incompatible hazardous materials by 1-hour fire barriers with openings protected in accordance with the California Building Code .
Exception: Storage in approved hazardous materials storage cabinets constructed in accordance with Section 5003.8.7.
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PYROPHORIC MATERIALS
6404.2 Outdoor storage. Outdoor storage of pyrophoric¶
materials in amounts exceeding the maximum allowable quantity per control area indicated in Table 5003.1.1(3) shall be in accordance with Sections 5001, 5003 and 5004, and this chapter.
The storage of silane gas, and gas mixtures with a silane concentration of 1.37 percent or more by volume, shall be in accordance with ANSI/CGA G-13.
6404.2.1 Distance from storage to exposures. The separation of pyrophoric solids, liquids and gases from buildings, lot lines, public streets, public alleys, public ways or means of egress shall be in accordance with the following:
Solids and liquids. Two times the separation required by Chapter 57 for Class IB flammable liquids.
Gases. The location and maximum amount of pyrophoric gas per storage area shall be in accordance with Table 6404.2.1.
6404.2.2 Weather protection. Where overhead construction is provided for sheltering outdoor storage areas of pyrophoric materials, the storage areas shall be provided with approved automatic fire-extinguishing system protection.
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