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The storage or use of hazardous materials in excess of those amounts specified in Table 415.6.5 shall be in accordance with the applicable provisions of Sections 415.7 and 415.8.
[F] TABLE 415.6.5
A DETACHED BUILDING IS REQUIRED WHERE THE QUANTITY OF MATERIAL EXCEEDS THAT SPECIFIED HEREIN
Material Class Solids and Liquids (tons)a, b Gases (cubic feet)a, b
Explosives Division 1.1 Maximum Allowable Quantity Not Applicable
Division 1.2 Maximum Allowable Quantity
Division 1.3 Maximum Allowable Quantity
Division 1.4 Maximum Allowable Quantity
Division 1.4c 1
Division 1.5 Maximum Allowable Quantity
Division 1.6 Maximum Allowable Quantity
Oxidizers Class 4 Maximum Allowable Quantity Maximum Allowable Quantity
Unstable (reactives) detonable Class 3 or 4 Maximum Allowable Quantity Maximum Allowable Quantity
Oxidizer, liquids and solids Class 3 1,200 Not Applicable
Class 2 2,000 Not Applicable
Organic peroxides Detonable Maximum Allowable Quantity Not Applicable
Class I Maximum Allowable Quantity Not Applicable
Class II 25 Not Applicable
Class III 50 Not Applicable
Unstable (reactives) nondetonable Class 3 1 2,000
Class 2 25 10,000
Water reactives Class 3 1 Not Applicable
Class 2 25 Not Applicable
Pyrophoric gasesd Not Applicable Not Applicable 2,000
For SI: 1 ton = 906 kg, 1 cubic foot = 0.02832 m3, 1 pound = 0.454 kg.
  1. For materials that are detonable, the distance to other buildings or lot lines shall be in accordance with Section 415.6 of this code or Chapter 56 of the International Fire Code based on trinitrotoluene (TNT) equivalence of the material, whichever is greater.
  2. "Maximum Allowable Quantity" means the maximum allowable quantity per control area set forth in Table 307.1(1).
  3. Limited to Division 1.4 materials and articles, including articles packaged for shipment, that are not regulated as an explosive under Bureau of Alcohol, Tobacco, Firearms and Explosives (BATF) regulations or unpackaged articles used in process operations that do not propagate a detonation or deflagration between articles, provided that the net explosive weight of individual articles does not exceed 1 pound.
  4. Detached buildings are not required, for gases in gas rooms that support H-5 fabrication facilities where the gas room is separated from other areas by a fire barrier with a fire-resistance rating of not less than 2 hours and the gas is located in a gas cabinet that is internally sprinklered, equipped with continuous leak detection, automatic shutdown and is not manifolded upstream of pressure controls. Additionally, the gas supply is limited to cylinders that do not exceed 125 pounds (57 kg) water capacity in accordance with 49 CFR 173.192  for Hazard Zone A toxic gases. 
[F] 415.6.5.1 Wall and Opening Protection
Where a detached building is required by Table 415.6.5, wall and opening protection based on fire separation distance is not required.

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508.1 General Building Heights and Areas, General
Exceptions: Occupancies separated in accordance with Section 510. Where required by Table 415.6.2, areas of Group H-1, H-2 and H-3 occupancies ...
508.1 General Building Heights and Areas, General
of these sections. Exceptions: Occupancies separated in accordance with Section 510. Where required by Table 415.6.5, areas of Group H-1, H-2 and H ...