[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: 49CFR173.127]

[Page 481-482]
 
                        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. 173.127  Class 5, Division 5.1--Definition and assignment of packing groups.

    (a) Definition. For the purpose of this subchapter, oxidizer 
(Division 5.1) means a material that may, generally by yielding oxygen, 
cause or enhance the combustion of other materials.
    (1) A solid material is classed as a Division 5.1 material if, when 
tested in accordance with the UN Manual of Tests and Criteria, its mean 
burning time is less than or equal to the burning time of a 3:7 
potassium bromate/cellulose mixture.
    (2) A liquid material is classed as a Division 5.1 material if, when 
tested in accordance with the UN Manual of Tests and Criteria, it 
spontaneously ignites or its mean time for a pressure rise from 690 kPa 
to 2070 kPa gauge is less then the time of a 1:1 nitric acid (65 
percent)/cellulose mixture.
    (b) Assignment of packing groups. (1) The packing group of a 
Division 5.1 material which is a solid shall be assigned using the 
following criteria:
    (i) Packing Group I, for any material which, in either concentration 
tested, exhibits a mean burning time less than the mean burning time of 
a 3:2 potassium bromate/cellulose mixture.
    (ii) Packing Group II, for any material which, in either 
concentration tested, exhibits a mean burning time less than or equal to 
the mean burning time of a 2:3 potassium bromate/cellulose mixture and 
the criteria for Packing Group I are not met.
    (iii) Packing Group III for any material which, in either 
concentration tested, exhibits a mean burning time less than or equal to 
the mean burning

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time of a 3:7 potassium bromate/cellulose mixture and the criteria for 
Packing Group I and II are not met.
    (2) The packing group of a Division 5.1 material which is a liquid 
shall be assigned using the following criteria:
    (i) Packing Group I for:
    (A) Any material which spontaneously ignites when mixed with 
cellulose in a 1:1 ratio; or
    (B) Any material which exhibits a mean pressure rise time less than 
the pressure rise time of a 1:1 perchloric acid (50 percent)/cellulose 
mixture.
    (ii) Packing Group II, any material which exhibits a mean pressure 
rise time less than or equal to the pressure rise time of a 1:1 aqueous 
sodium chlorate solution (40 percent)/cellulose mixture and the criteria 
for Packing Group I are not met.
    (iii) Packing Group III, any material which exhibits a mean pressure 
rise time less than or equal to the pressure rise time of a 1:1 nitric 
acid (65 percent)/cellulose mixture and the criteria for Packing Group I 
and II are not met.

[Amdt. 173-261, 62 FR 24732, May 6, 1997]