AFMAN 24-204(I)/TM 38-250/NAVSUP PUB 505/MCO P4030.19H/ DLAI 4145.3
11 DECEMBER 2001
Figure A4.1. Hazard Classes.
Explosives (with mass explosion hazard)
Explosives (with a projection hazard)
Explosives (with predominately a fire
Dangerous when wet material
Explosives (with no significant blast
Very insensitive explosives; blasting
Extremely insensitive detonating
Poisonous (toxic) material
Infectious substances (etiologic
Miscellaneous hazardous material
A4.3.2. Items Not Specifically Listed. If a material is not specifically listed in table A4.1, determine the PSN by
comparing the characteristics of the items with the definitions of the various hazard classes in this manual. Assign a
"Not Otherwise Specified" (N.O.S.) name based on the hazard class of the material. Examples are: "FLAMMABLE
LIQUID, N.O.S.; CORROSIVE SOLID, N.O.S." Attachment 1 contains hazardous class definitions. Determine the
appropriate technical name according to A4.3.1.
A4.3.3. Tentative PSN Assignment. A material for which the hazard class must be determined by testing, or a
material that is a hazardous waste, the shipper may assign a tentative shipping name, based on:
The defining criteria of the hazard class.
The hazard precedence prescribed in A4.3.
The shippers knowledge of the material.
A126.96.36.199 for new explosives.
If a N.O.S. PSN is assigned, a technical name is not required.
HA4.3.4 Precedence of Hazard. Assign any material specifically identified and listed in table A4.1 the hazard
class identified in column 3 of table A4.1. Classification tools identified in A4.3.1 should be used to determine
appropriate hazardous material description. If required, classify a hazardous material that is not specifically
identified and listed in table A4.1 (or is a mixture of materials), and meets the definition of more than one hazard,
according to the following order of precedence:
Class 7 (Radioactive material, other than limited quantities). When limited quantities are involved the
other hazardous properties take precedence.
Class 1 (Explosives).
Class 2.3 (poisonous gas).
Class 2.1 (flammable gas). See also Class 9.
Class 2.2 (nonflammable gas). See also Class 9.
Class 5.2 (organic peroxide).
Class 6.2 (infectious substances or etiologic agents).
Class 4.1 (flammable solid). Only self-reactive substances and wetted explosives.
Class 4.2 (substances liable to spontaneous combustion). Only pyrophoric substances.
Class 6.1 (poisonous substances), PG I, poisonous by inhalation only.
Small quantities of compressed gas such as starter fluid (Class 2.1) or fire extinguisher (Class 2.2) installed
on a vehicle do not take precedence over the flammable liquid (Class 3).
If required, classify other hazardous materials not identified above according to 49 CFR 173.2a