Class 1 - Classification

When classifying dangerous goods, any article or substance that is suspected of having explosive characteristics must first be considered for classification in Class 1. The procedures for determining Class 1 classification are outlined in IATA Subsections 3.1.5.2 through 3.1.5.5, the IMDG Code part 2, and 49 CFR 173 Subpart C.

Goods are NOT classified as Class 1 if:

• The transport of the explosive substance is forbidden because of excessive sensitivity (unless specially authorized).
• The article or substance comes within scope of explosive articles or substances that are specifically excluded from Class 1 by the class definition.
• The article or substance has no explosive properties.

Articles and substances are classified as Class 1 in accordance with the tests, procedures, and criteria prescribed in Section 2.1.3 of the "UN Recommendations on the Transport of Dangerous Goods" and Part I of the "UN Manual of Tests and Criteria."

A report on the series of tests used to determine classification must be drawn up in accordance with the requirements of the competent authority. In particular, the report must contain information on:

• The composition of the substance or the structure of the article
• The quantity of substance or number of articles per test
• The type and construction of the packaging
• The test assembly, including in particular the nature, quantity, and arrangement of the means of initiation or ignition used
• The course of the test, including in particular the time elapsing until the occurrence of the first noteworthy reaction of the substance or article, the duration and characteristics of the reaction, and an estimate of the latter's completeness
• The effect of the reaction on the immediate surroundings (up to 25 m from the site of the test)
• The effect of the reaction on more remote surroundings (more than 25 m from the site of the test)
• The atmospheric conditions during the test

Assessment of the hazard division is usually made on the basis of test results. Other test results, as well as data assembled from accidents which have occurred, may also be taken into account.

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