#### § 172.402 Additional labeling requirements.

(a) *Subsidiary hazard labels.* Each package containing a hazardous material—

(1) Shall be labeled with primary and subsidiary hazard labels as specified in column 6 of the [§ 172.101](/on/2024-09-24/title-49/section-172.101) table (unless excepted in [paragraph (a)(2)](/on/2024-09-24/title-49/section-172.402#p-172.402(a)(2)) of this section); and

(2) For other than Class 1 or Class 2 materials (for subsidiary labeling requirements for Class 1 or Class 2 materials see paragraph (e) or paragraphs (f) and (g), respectively, of this section), if not already labeled under [paragraph (a)(1)](/on/2024-09-24/title-49/section-172.402#p-172.402(a)(1)) of this section, shall be labeled with subsidiary hazard labels in accordance with the following table:

Subsidiary Hazard Labels

| Subsidiary hazard level (packing group) | Subsidiary Hazard (Class or Division) | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 3 | 4.1 | 4.2 | 4.3 | 5.1 | 6.1 | 8 |
| I | X | \*\*\* | \*\*\* | X | X | X | X |
| II | X | X | X | X | X | X | X |
| III | \* | X | X | X | X | X | X |
| | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| X—Required for all modes. | | | | | | | |
| \*—Required for all modes, except for a material with a flash point at or above 38 °C (100 °F) transported by rail or highway. | | | | | | | |
| \*\*—Reserved | | | | | | | |
| \*\*\*—Impossible as subsidiary hazard. | | | | | | | |

(b) *Display of hazard class on labels.* The appropriate hazard class or division number must be displayed in the lower corner of a primary hazard label and a subsidiary hazard label.

(c) *Cargo Aircraft Only label.* Each person who offers for transportation or transports by aircraft a package containing a hazardous material which is authorized on cargo aircraft only shall label the package with a CARGO AIRCRAFT ONLY label specified in [§ 172.448 of this subpart](/on/2024-09-24/title-49/part-172/section-172.448).

(d) *Class 7 (Radioactive) Materials.* Except as otherwise provided in this paragraph, each package containing a Class 7 material that also meets the definition of one or more additional hazard classes must be labeled as a Class 7 material as required by [§ 172.403](/on/2024-09-24/title-49/section-172.403) and for each additional hazard.

(1) A subsidiary label is not required for a package containing material that satisfies all of the criteria in [§ 173.4](/on/2024-09-24/title-49/section-173.4), [§ 173.4a](/on/2024-09-24/title-49/section-173.4a), or [§ 173.4b](/on/2024-09-24/title-49/section-173.4b) applicable to the subsidiary hazard class.

(2) Each package or overpack containing fissile material, other than fissile-excepted material (see [§ 173.453 of this subchapter](/on/2024-09-24/title-49/section-173.453)) must bear two FISSILE labels, affixed to opposite sides of the package or overpack, which conforms to the figure shown in [§ 172.441](/on/2024-09-24/title-49/section-172.441); such labels, where applicable, must be affixed adjacent to the labels for radioactive materials.

(e) *Class 1 (explosive) Materials.* In addition to the label specified in column 6 of the [§ 172.101](/on/2024-09-24/title-49/section-172.101) table, each package of Class 1 material that also meets the definition for:

(1) Division 6.1, Packing Groups I or II, shall be labeled POISON or POISON INHALATION HAZARD, as appropriate.

(2) Class 7, shall be labeled in accordance with [§ 172.403 of this subpart](/on/2024-09-24/title-49/part-172/section-172.403).

(f) *Division 2.2 materials.* In addition to the label specified in column 6 of the [§ 172.101](/on/2024-09-24/title-49/section-172.101) table, each package of Division 2.2 material that also meets the definition for an oxidizing gas (see [§ 171.8 of this subchapter](/on/2024-09-24/title-49/section-171.8)) must be labeled OXIDIZER.

(g) *Division 2.3 materials.* In addition to the label specified in column 6 of the [§ 172.101](/on/2024-09-24/title-49/section-172.101) table, each package of Division 2.3 material that also meets the definition for:

(1) Division 2.1, must be labeled Flammable Gas;

(2) Division 5.1, must be labeled Oxidizer; and

(3) Class 8, must be labeled Corrosive.

[Amdt. 172-123, [55 FR 52594](https://www.federalregister.gov/citation/55-FR-52594), Dec. 21, 1990, as amended at [56 FR 66255](https://www.federalregister.gov/citation/56-FR-66255), Dec. 20, 1991; Amdt. 172-139, [59 FR 67490](https://www.federalregister.gov/citation/59-FR-67490), Dec. 29, 1994; Amdt. 172-140, [60 FR 26805](https://www.federalregister.gov/citation/60-FR-26805), May 18, 1995; Amdt. 172-149, [61 FR 27173](https://www.federalregister.gov/citation/61-FR-27173), May 30, 1996; [62 FR 39405](https://www.federalregister.gov/citation/62-FR-39405), July 22, 1997; [66 FR 33425](https://www.federalregister.gov/citation/66-FR-33425), June 21, 2001; [69 FR 3668](https://www.federalregister.gov/citation/69-FR-3668), Jan. 26, 2004; [74 FR 2252](https://www.federalregister.gov/citation/74-FR-2252), Jan. 14, 2009; [76 FR 56314](https://www.federalregister.gov/citation/76-FR-56314), Sept. 13, 2011; [79 FR 40609](https://www.federalregister.gov/citation/79-FR-40609), July 11, 2014]