2704 Storage — 2025 California Fire Code

2704.1 General.¶

Storage of hazardous materials shall comply with Section 2703 and this section and other applicable provisions of this code.

Exceptions & meaning →

2704.2 Fabrication areas.¶

Hazardous materials storage and the maximum quantities of hazardous materials in use and storage allowed in fabrication areas shall be in accordance with Sections 2704.2.1 through 2704.2.2.1.

2704.2.1 Location of HPM storage in fabrication areas. Storage of HPM in fabrication areas shall be within approved or listed storage cabinets, gas cabinets, exhausted enclosures or within a workstation as follows:

Flammable and combustible liquid storage cabinets shall comply with Section 5704.3.2.
Hazardous materials storage cabinets shall comply with Section 5003.8.7.
Gas cabinets shall comply with Section 5003.8.6. Gas cabinets for highly toxic or toxic gases shall also comply with Section 6004.1.2.
Exhausted enclosures shall comply with Section 5003.8.5. Exhausted enclosures for highly toxic or toxic gases shall also comply with Section 6004.1.3.
Workstations shall comply with Section 2705.2.3.

2704.2.2 Maximum aggregate quantities in fabrication areas. The aggregate quantities of hazardous materials stored or used in a single fabrication area shall be limited as specified in this section.

Exception: Fabrication areas containing quantities of hazardous materials not exceeding the maximum allowable quantities per control area established by Sections 5003.1.1, 5704.3.4 and 5704.3.5.

2704.2.2.1 Storage and use in fabrication areas. The maximum quantities of hazardous materials stored or used in a single fabrication area shall not exceed the quantities set forth in Table 2704.2.2.1.

TABLE 2704.2.2.1—QUANTITY LIMITS FOR HAZARDOUS MATERIALS IN A SINGLE FABRICATION AREA IN GROUP H-5a

HAZARD CATEGORY	SOLIDS (pounds per square foot)	LIQUIDS (gallons per square foot)	GAS (cubic feet @ NTP per square foot)
Physical-Hazard Materials	Physical-Hazard Materials	Physical-Hazard Materials	Physical-Hazard Materials
Combustible dust	Note b	Not Applicable	Not Applicable
Combustible fiber Loose Baled	Note b Notes b and c	Not Applicable	Not Applicable
Combustible liquid Class II Class IIIA Class IIIB Combination Class I, II and IIIA	Not Applicable	0.02 0.04 Not Limited 0.08	Not Applicable
Cryogenic gas Flammable Oxidizing	Not Applicable	Not Applicable	Note d 2.5
Explosives	Note b	Note b	Note b
Flammable gas Gaseous Liquefied	Not Applicable	Not Applicable	Note d Note d
Flammable liquid Class IA Class IB Class IC Combination Class IA, IB and IC Combination Class I, II and IIIA	Not Applicable	0.005 0.05 0.05 0.05 0.08	Not Applicable
Flammable solid	0.002	Not Applicable	Not Applicable
Organic peroxide Unclassified detonable Class I Class II Class III Class IV Class V	Note b Note b 0.05 0.2 Not Limited Not Limited	Note b Note b 0.0025 0.02 Not Limited Not Limited	Not Applicable

27-8 2025 CALIFORNIA FIRE CODE

SEMICONDUCTOR FABRICATION FACILITIES

TABLE 2704.2.2.1—QUANTITY LIMITS FOR HAZARDOUS MATERIALS IN A SINGLE FABRICATION AREA IN GROUP H-5a—continued

HAZARD CATEGORY	SOLIDS (pounds per square foot)	LIQUIDS (gallons per square foot)	GAS (cubic feet @ NTP per square foot)
Oxidizing gas Gaseous Liquefied Combination of gaseous and liquefied	Not Applicable	Not Applicable	2.5 2.5 2.5
Oxidizer Class 4 Class 3 Class 2 Class 1 Combination Class 1, 2, 3	Note b 0.006 0.006 0.006 0.006	Note b 0.06 0.06 0.06 0.06	Not Applicable
Pyrophoric materials	Note b	0.0025	Notes d and e
Unstable (reactive) Class 4 Class 3 Class 2 Class 1	Note b 0.05 0.2 Not Limited	Note b 0.005 0.02 Not Limited	Note b Note b Note b Not Limited
Water reactive Class 3 Class 2 Class 1	0.02f 0.5 Not Limited	0.0025 0.05 Not Limited	Not Applicable
Health-Hazard Materials	Health-Hazard Materials	Health-Hazard Materials	Health-Hazard Materials
Corrosives	Not Limited	Not Limited	Not Limited
Highly toxic	Not Limited	Not Limited	Note d
Toxics	Not Limited	Not Limited	Note d
For SI: 1 pound = 0.454 kg, 1 pound per square foot = 4.882 kg/m2, 1 gallon per square foot = 40.7 L/m2, 1 cubic foot @ NTP/square foot = 0.305 m3 @ NTP/m2, 1 cubic foot = 0.02832 m3. a. Hazardous materials within piping shall not be included in the calculated quantities. b. Quantity of hazardous materials in a single fabrication area shall not exceed the maximum allowable quantities per control area in Tables 5003.1.1(1) and 5003.1.1(2). c. Densely packed baled cotton that complies with the packing requirements of ISO 8115 shall not be included in this material class. d. The aggregate quantity of flammable, pyrophoric, toxic and highly toxic gases shall not exceed the greater of 0.2 cubic feet at NTP/square foot or 9,000 cubic feet at NTP. e. The aggregate quantity of pyrophoric gases in the building shall not exceed the amounts set forth in Table 5003.8.2. f. Quantity of Class 3 water-reactive solids in a single tool shall not exceed 1 pound.

Exceptions & meaning →

2704.3 Indoor storage outside of fabrication areas.¶

The indoor storage of hazardous materials outside of fabrication areas shall be in accordance with Sections 2704.3.1 through 2704.3.3.

2704.3.1 HPM storage. The indoor storage of HPM in quantities greater than those listed in Sections 5003.1.1 and 5704.3.4 shall be in a room complying with the requirements of the California Building Code and this code for a liquid storage room, HPM room or gas room as appropriate for the materials stored.

2704.3.2 Other hazardous materials storage. The indoor storage of other hazardous materials shall comply with Sections 5001, 5003 and 5004 and other applicable provisions of this code.

2704.3.3 Separation of incompatible hazardous materials. Incompatible hazardous materials in storage shall be separated from each other in accordance with Section 5003.9.8.

Exceptions & meaning →