政策法规现行有效美国危险品合规

§ 173.50 Class 1—Definitions.

效力	法规类型	发布日期	生效日期	发文机构
现行有效	部门规章	2026-08-07	2026-09-08	Code of Federal Regulations (CFR) - Transportation (Title 49)

发布08-07

生效09-08

摘要总结AI 辅助解读

本条款为美国《联邦法规汇编》第49篇（交通）中关于危险品运输的定义性规定，专门界定1类爆炸品及其六个子类别（Division 1.1至1.6）。它明确了“爆炸物”的法律定义，并依据危害程度（如整体爆炸、抛射、火灾、轻微爆炸等）对爆炸品进行分级。该定义是后续所有包装、标记、标签及运输操作合规的基础依据，直接影响货物分类与申报准确性。

(a) Explosive. For the purposes of this subchapter, an explosive means any substance or article, including a device, which is designed to function by explosion ( i.e., an extremely rapid release of gas and heat) or which, by chemical reaction within itself, is able to function in a similar manner even if not designed to function by explosion, unless the substance or article is otherwise classed under the provisions of this subchapter. The term includes a pyrotechnic substance or article, unless the substance or article is otherwise classed under the provisions of this subchapter.
(b) Explosives in Class 1 are divided into six divisions as follows:

- (1) Division 1.1 consists of explosives that have a mass explosion hazard. A mass explosion is one which affects almost the entire load instantaneously.

- (2) Division 1.2 consists of explosives that have a projection hazard but not a mass explosion hazard.

- (3) Division 1.3 consists of explosives that have a fire hazard and either a minor blast hazard or a minor projection hazard or both, but not a mass explosion hazard.

- (4) Division 1.4 consists of explosives that present a minor explosion hazard. The explosive effects are largely confined to the package and no projection of fragments of appreciable size or range is to be expected. An external fire must not cause virtually instantaneous explosion of almost the entire contents of the package.

- (5) Division 1.5 1 consists of very insensitive explosives. This division is comprised of substances which have a mass explosion hazard but are so insensitive that there is very little probability of initiation or of transition from burning to detonation under normal conditions of transport.

1 The probability of transition from burning to detonation is greater when large quantities are transported in a vessel.

- (6) Division 1.6 2 consists of extremely insensitive articles that do not have a mass explosion hazard. This division is comprised of articles which predominately contain extremely insensitive substances and that demonstrate a negligible probability of accidental initiation or propagation.

2 The risk from articles of Division 1.6 is limited to the explosion of a single article.

[Amdt. 173-224, 55 FR 52617 Dec. 21, 1990, as amended at 56 FR 66267, Dec. 20, 1991; 66 FR 45183, Aug. 28, 2001; 68 FR 48569, Aug. 14, 2003; 78 FR 1074, Jan. 7, 2013; 82 FR 15876, Mar. 30, 2017]