(a) Each material listed in Table 148.10 of this part must be segregated from incompatible materials in accordance with—

1. (1) The requirements of Tables 148.120A and 148.120B of this section that pertain to the primary or subsidiary hazard class to which the materials belong. Whenever a subsidiary hazard may exist, the most stringent segregation requirement applies; and
2. (2) Any specific requirements in Subpart D of this part.

(c) Definitions and application of segregation terms:

1. (1) “Separated from” means located in different cargo compartments or holds when stowed under deck. If the intervening deck is resistant to fire and liquid, a vertical separation, i.e., in different cargo compartments, is acceptable as equivalent to this segregation.
2. (2) “Separated by a complete cargo compartment or hold from” means either a vertical or horizontal separation, for example, by a complete cargo compartment or hold. If the intervening decks are not resistant to fire and liquid, only horizontal separation is acceptable.

3. (3) “Separated longitudinally by an intervening complete cargo compartment or hold from” means that vertical separation alone does not meet this requirement.

   Table 148.120A—Segregation Between Incompatible Bulk Solid Cargoes

   Bulk solid materials	Class	4.1	4.2	4.3	5.1	6.1	7	8	9/PDM
   Flammable solid	4.1	X
   Spontaneously combustible material	4.2	2	X
   Dangerous when wet material	4.3	3	3	X
   Oxidizer	5.1	3	3	3	X
   Poisonous material	6.1	X	X	X	2	X
   Radioactive material	7	2	2	2	2	2	X
   Corrosive material	8	2	2	2	2	X	X	X
   Miscellaneous hazardous material and potential dangerous material	9/PDM	X	X	X	X	X	2	X	X
   Numbers and symbols indicate the following terms as defined in § 148.3 of this part:
   2—“Separated from”.
   3—“Separated by a complete hold or compartment from”.
   X—No segregation required, except as specified in an applicable section of this subpart or Subpart E of this part.

   Table 148.120B—Segregation Between Bulk Solid Cargoes and Incompatible Packaged Cargoes

   Packaged hazardous material	Bulk solid material
   Class	4.1	4.2	4.3	5.1	6.1	7	8	9/PDM
   Explosives	1.11.21.5	4	4	4	4	2	2	4	X
   Explosives	1.31.6	3	3	4	4	2	2	2	X
   Explosives	1.4	2	2	2	2	X	2	2	X
   Flammable gas	2.1	2	2	1	2	X	2	2	X
   Non-flammable compressed gas	2.2	2	2	X	X	X	2	1	X
   Poisonous gas	2.3	2	2	X	X	X	2	1	X
   Flammable liquid	3	2	2	2	2	X	2	1	X
   Flammable solid	4.1	X	1	X	1	X	2	1	X
   Spontaneously combustible material	4.2	1	X	1	2	1	2	1	X
   Dangerous when wet material	4.3	X	1	X	2	X	2	1	X
   Oxidizer	5.1	1	2	2	X	1	1	2	X
   Organic peroxide	5.2	2	2	2	2	1	2	2	X
   Poisonous material	6.1	X	1	X	1	X	X	X	X
   Infectious substance	6.2	3	3	2	3	1	3	3	X
   Radioactive material	7	2	2	2	1	X	X	2	X
   Corrosive material	8	1	1	1	2	X	2	X	X
   Miscellaneous hazardous material	9	X	X	X	X	X	X	X	X
   Numbers and symbols indicate the following terms as defined in § 148.3 of this part:
   1—“Away from”.
   2—“Separated from”.
   3—“Separated by a complete hold or compartment from”.
   4—“Separated longitudinally by an intervening complete compartment or hold from”.
   X—No segregation required, except as specified in an applicable section of this subpart or Subpart E of this part.