[Code of Federal Regulations]
[Title 49, Volume 2]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR173.116]

[Page 476]
 
                        TITLE 49--TRANSPORTATION
 
 CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 173--SHIPPERS--GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS--Table of Contents
 
  Subpart D--Definitions Classification, Packing Group Assignments and 
    Exceptions for Hazardous Materials Other Than Class 1 and Class 7
 
Sec. 173.116  Class 2--Assignment of hazard zone.

    (a) The hazard zone of a Class 2, Division 2.3 material is assigned 
in column 7 of the Sec. 172.101 table. There are no hazard zones for 
Divisions 2.1 and 2.2. When the Sec. 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................................  LC50 less than or equal to 200 ppm.
B................................  LC50 greater than 200 ppm and less
                                    than or equal to 1000 ppm.
C................................  LC50 greater than 1000 ppm and less
                                    than or equal to 3000 ppm.
D................................  LC50 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 Sec. 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]