U.S. Code of Federal Regulations
Regulations most recently checked for updates: Jun 09, 2023
(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|
(b) The criteria specified in paragraph (a) of this section are represented graphically in § 173.133, Figure 1.