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Class 1 Acceptance Criteria

Goods of Class 1 are assigned to one of six divisions, depending on the type of hazard they present and to one of thirteen compatibility groups which identify the kinds of explosive substances and articles that are deemed to be compatible.

Compatibility Groups

CG Type Material
A Initiating (primary) explosives
B Detonators and similar initiating devices not containing two or more effective protective features
C Bulk propellants, propelling charges, and devices containing propellants, w/ or w/o own means of ignition
D Bulk black powder, bulk HE, and AE w/o propelling charge but containing HE w/o its own means of initiation
E AE containing HE w/o it’s own means of initiation and either containing, or with, a solid propelling charge
F AE containing HE with its own means of initiation, i.e., the initiating device present has less than two effective protective features, and w/ or w/o solid propelling charge
G Illuminating, incendiary, and smoke (including hexachlorethane) or tear producing AE excluding those that are water-activated or that contain White Phosphorous (WP) or a flammable liquid or gel
H AE containing WP. Contains fillers that are spontaneously flammable when exposed to water or the atmosphere
J AE containing flammable liquids or gels other than those in CG H
K AE containing toxic chemical agents (agents more severe than tear-producing)
L AE not included in other CG. Present special risk that does not permit storage with other types of AE, other explosives, or dissimilar AE.
N AE articles with only EIDS
S AE that presents no significant hazard. Projections do not hinder fire fighting. Projections less than 8 joules or energy.

UN/DOT Acceptance Procedure

(for substances/articles in consideration for Class 1)

The acceptance procedure (figure below) is used to determine whether a new product, as offered for transport, is a candidate for Class 1. In this context, a new product is one which, in the opinion of the competent authority, involves any of the following:

  • A new substance or a combination of mixture of substances, intended to function as an explosive or pyrotechnic, which is considered to be significantly different from other combinations or mixtures already classified
  • A new substance or article, not intended for explosive use, which has, or is suspected of having, explosive properties
  • A new design of article containing an explosive substance or an article containing a new explosive substance or a new combination or mixture of explosive substances
  • A new design of package for an explosive substance or article including a new type of inner packaging or a new arrangement of articles (a relatively minor change to an inner or outer packaging can be critical and can convert a lesser risk into a mass explosion risk).

The classification procedure should be undertaken before a new product is offered for transport. The producer, or other applicant for the classification of a new product, should provide adequate information concerning the names and characteristics of all explosive substances in the product and should furnish the results of all relevant tests that have been done. 

Class 1 flowchart

(Click the image to expand.)

(Source: United Nations, Recommendations on the Transport of Dangerous Goods)

Point of Contact

Jorge Flores 256.327.4018