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Subpart A—General19

Subpart B—Preparation of Hazardous Materials for Transportation22

Subpart C—Definitions, Classification and Packaging for Class 118

Subpart D—Definitions Classification, Packing Group Assignments and Exceptions for Hazardous Materials Other Than Class 1 and Class 726

Subpart E—Non-bulk Packaging for Hazardous Materials Other Than Class 1 and Class 763

Subpart F—Bulk Packaging for Hazardous Materials Other Than Class 1 and Class 79

Subpart G—Gases; Preparation and Packaging36

Subpart I—Class 7 (Radioactive) Materials47

Regulationcurrent

49 CFR 173.140

Class 9—Definitions.

Current as of 2026-08-18 Government source

eCFR editorial compilationAuthoritative but unofficial

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For the purposes of this subchapter, miscellaneous hazardous material (Class 9) means a material which presents a hazard during transportation but which does not meet the definition of any other hazard class. This class includes:#

(a)Any material which has an anesthetic, noxious or other similar property which could cause extreme annoyance or discomfort to a flight crew member so as to prevent the correct performance of assigned duties; or#

(b)Any material that meets the definition in § 171.8 of this subchapter for an elevated temperature material, a hazardous substance, a hazardous waste, or a marine pollutant.#

10-0130

Syngenta — Hazardous Materials Safety Interpretation

173.140 · interpreted by

Syngenta — Hazardous Materials Safety Interpretation

Currie Industrial Services, LLC — Hazardous Materials Safety Interpretation

HMT Associates, L.L.C — Hazardous Materials Safety Interpretation

Hydrol Chemical Co., Inc. — Hazardous Materials Safety Interpretation

Mr. Christian W. Solum — Hazardous Materials Safety Interpretation

Swidler Berlin, LLP — Hazardous Materials Safety Interpretation

Michelman, Inc — Hazardous Materials Safety Interpretation

Degussa Corporation — Hazardous Materials Safety Interpretation

Swidler Berlin Shereff Friedman, LLP — Hazardous Materials Safety Interpretation

University of California, Irvine Environmental Health and Safety — Hazardous Materials Safety Interpretation

Cosmo International Corporation — Hazardous Materials Safety Interpretation

Keller and Heckman LLP — Hazardous Materials Safety Interpretation

U.S. Geological Survey — Hazardous Materials Safety Interpretation

Aristech Chemical Corporation — Hazardous Materials Safety Interpretation

Monitor-Merrimac Memorial Bridge Tunnel — Hazardous Materials Safety Interpretation

Mississippi Transport, Inc. — Hazardous Materials Safety Interpretation

LAX Civil Aviation Security — Hazardous Materials Safety Interpretation