49 CFR 175.78
Stowage compatibility of cargo.
(a) For stowage on an aircraft, in a cargo facility, or at any other area at an airport designated for the stowage of hazardous materials, packages containing hazardous materials which might react dangerously with one another may not be placed next to each other or in a position that would allow a dangerous interaction in the event of leakage. As a minimum, the segregation prescribed in the following table must be maintained.
Table 1 A B C D E F G A Explosives and Blasting Agents or ICAO Class 1 Note 3 Note 4 Note 4 Note 4 Note 4 Note 4 X B Compressed gases or ICAO Class 2 Note 4 C Flammable liquids or ICAO Class 3 Note 4 X D Flammable liquids and solids (labeled SPONTANEOUSLY COMBUSTIBLE) or ICAO Division 4.2 Note 4 X X E Flammable solids (labeled DANGEROUS WHEN WET) or ICAO Division 4.3 Note 4 X X F Oxidizers or ICAO Division 5.1 and Organic peroxides or ICAO Division 5.2 Note 4 X X X X G Corrosive materials or ICAO Class 8 X X X X Note 1: The letters across the top of the table have the same meaning as the letters along the left side of the table. Note 2: An “X” at the intersection of a row and a column in the table means that packages containing the indicated classes of hazardous materials may not be stowed next to or in contact with each other, or in a position which would allow interaction in the event of leakage of the contents. Note 3: For import or export shipment, explosives other than explosives of ICAO Division 1.4, Compatibility Group S, that do not belong to the same compatibility group according to the ICAO Technical Instructions may not be stowed together, except that compatibility groups C, D and E may be stowed together. Explosives of ICAO Division 1.4, Compatibility Group S may be stowed with explosives of all compatibility groups with the exception of A and L. Note 4: Explosives, other than safety explosives (ICAO Division 1.4, Compatibility Group S) must not be stowed together with this class.
(b) No person may stow a package labeled BLASTING AGENT on an aircraft next to, or in a position that will allow contact with a package of special fireworks or railway torpedoes.
[Amdt. 175-1, 41 FR 16106, Apr. 15, 1976, as amended by Amdt. 175-8, 44 FR 31184, May 31, 1979; Amdt. 175-22, 47 FR 24587, June 7, 1982; Amdt. 175-25, 47 FR 54823, Dec. 6, 1982; Amdt. 175-30, 48 FR 53713, Nov. 29, 1983; Amdt. 175-50, 58 FR 50505, Sept. 27, 1993]