USDOT HazMat Placards

Class 1 Explosives (pg 2 of 2)
49CFR 173.50



Compatibility Table for Class 1 Materials
49CFR 177.848(f)
DX42 2XXXXXX34/5

Compatibility Table Notes:
49CFR 177.848(g)

'X' Indicates that explosives of different compatibility groups may not be carried on the same transport vehicle.

'1' An explosive from compatibility group L shall only be carried on the same transport vehicle with an identical explosive.

'2' Any combination of explosives from compatibility groups C, D, or E is assigned to compatibility group E.

'3' Any combination of explosives from compatibility groups C, D, or E with those in compatibility group N is assigned to compatibility group D.

'4' Refer to 49CFR 177.835(g) when transporting detonators.

'5' Division 1.4S fireworks may not be loaded on the same transport vehicle with Division 1.1 or 1.2 materials.

A blank space in the table indicates that no restrictions apply.

Except as provided in [the following paragraph], explosives of the same compatibility group but of different divisions may be transported together provided that the whole shipment is transported as though its entire contents were of the lower numerical division (i.e., Division 1.1 being lower than 1.2). For example, a mixed shipment of Division 1.2 materials and Division 1.4 materials, both of compatibility group D, must be transported as Division 1.2 materials

When Division 1.5 materials, compatibility group D, are transported in the same freight container as Division 1.2 materials, compatibility group D, the shipment must be transported as Division 1.1 materials, compatibility group D.

Authorization to offer and transport explosives
49CFR 173.51

  1. Unless otherwise provided in [49CFR 173], no person may offer for transportation or transport an explosive, unless it has been tested and classed and approved by the Associate Administrator for Hazardous Materials Safety (49CFR 173.56)
  2. Reports of explosives approved by the Department of Defense or the Department of Energy must be filed with, and receive acknowledgement in writing by the Associate Administrator for Hazardous Materials Safety prior to such explosives being offered for transportation.

Provisions for using old classifications of explosives
49CFR 173.53

Where the classification system in effect prior to January 1, 1991, is referenced in State or local laws, ordinances or regulations not pertaining to the transportation of hazardous materials, the following table may be used to compare old and new hazard class names:

Class name prior to Jan 1, 1991
Division 1.1Class A explosives
Division 1.2Class A or Class B explosives
Division 1.3Class B explosives
Division 1.4Class C explosives
Division 1.5Blasting Agents
Division 1.6No applicable hazard class

Forbidden explosives
49CFR 173.54

Unless otherwise provided in [49CFR 173], the following explosives shall not be offered for transportation or transported:

  1. An explosive that has not been approved in accordance with 49CFR 173.56.
  2. An explosive mixture or device containing a chlorate and also containing:
    1. An ammonium salt, including a substituted ammonium or quaternary ammonium salt; or
    2. An acidic substance, including a salt of a weak base and a strong acid.
  3. A leaking or damaged package of explosives.
  4. Propellants that are unstable, condemned or deteriorated.
  5. Nitroglycerin, diethylene glycol dinitrate, or any other liquid explosives not specifically authorized by [49CFR 173].
  6. A loaded firearm (except as provided in 14 CFR 108.11).
  7. Fireworks that combine an explosive and a detonator.
  8. Fireworks containing yellow or white phosphorus.
  9. A toy torpedo, the maximum outside dimensions of which exceeds 23mm, or a toy torpedo containing a mixture of potassium chlorate, black antimony (antimony sulfide), and sulfur, if the weight of the explosive material in the device exceeds 0.26g.
  10. Explosives specifically forbidden in [49CFR 172.101].
  11. Explosives not meeting the acceptance criteria specified in [49CFR 173.57].
  12. An explosive article with its means of initiation or ignition installed, unless approved in accordance with [49CFR 173.56].


Last updated: Feb 2007

Related Resources

  • Guide for Handling Household Chemicals
    Things you can do to make your home safer.
  • USDOT Hazardous Materials Table 49 CFR 172.101
    An online version of the USDOT hazardous materials table from 49CFR 172.101. This table can be sorted by proper shipping name, UN/NA ID and/or by primary hazard class/division.
  • ERG (Emergency Response Guidebook)
    Have you ever wondered what those four digit numbers on the placards on the side of trucks and rail cars mean? Our online 2004ERG will give you your answer. This is an online version of the guidebook produced by the USDOT for first responders during the initial phase of a Dangerous goods/HazMat incident.
  • Chemical Database
    This database focuses on the most common chemical compounds used in the home and industry.

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While excerpts from the Code of Federal Regulations Title 49 (49CFR) and the "Emergency Response Guidebook" are in the public domain, the image files on these pages, the design of these pages as well as all other materials on this site and graphics files are copyrighted by J.K. Barbalace, inc. Copyrighted material on this site, including graphics files, MAY NOT BE REPRODUCED in any form without the express permission.


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To ensure regulatory compliance when transporting hazardous materials or dangerous goods, one must receive proper training and certification from a qualified instructor and refer to the current year's Code of Federal Regulations Title 49 (49CFR) or your country's shipping regulations. In matters regarding workplace safety, refer to current OSHA regulations (29CFR) and NIOSH guidelines or your own country's health and safety regulations. No one should ever enter into a hazardous environment without proper training from qualified instructors.

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