政策法规现行有效美国危险品合规

§ 173.116 Class 2—Assignment of hazard zone.

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

本条款规定美国49 CFR下第2类危险货物中毒性气体（Division 2.3）的危险区（Hazard Zone）判定标准。依据吸入毒性LC50数值，将物质划分为A、B、C、D四个等级：LC50≤200ppm为A级，>200且≤1000ppm为B级，>1000且≤3000ppm为C级，>3000或≤5000ppm为D级。该标准直接决定运输包装、标记及应急要求，是危险品合规的核心技术依据。

(a) The hazard zone of a Class 2, Division 2.3 material is assigned in column 7 of the § 172.101 table. There are no hazard zones for Divisions 2.1 and 2.2. When the § 172.101 table provides more than one hazard zone for a Division 2.3 material, or indicates that the hazard zone be determined on the basis of the grouping criteria for Division 2.3, the hazard zone shall be determined by applying the following criteria:

Hazard zone Inhalation toxicity A LC 50 less than or equal to 200 ppm. B LC 50 greater than 200 ppm and less than or equal to 1000 ppm. C LC 50 greater than 1000 ppm and less than or equal to 3000 ppm. D LC 50 greater than 3000 ppm or less than or equal to 5000 ppm.

(b) The criteria specified in paragraph (a) of this section are represented graphically in § 173.133, Figure 1.

[Amdt. 173-224, 55 FR 52634, Dec. 21, 1990, as amended at 56 FR 66268, Dec. 20, 1991; Amdt. 173-138, 59 FR 49133, Sept. 26, 1994; 67 FR 61013, Sept. 27, 2002]