Criteria

The heading of Class 5.1 covers substances which, while in themselves not necessarily combustible,
may, generally by yielding oxygen, cause or contribute to the combustion of other material, and
articles containing such substances.

The substances of Class 5.1 and articles containing such substances are subdivided as follows:
O Oxidizing substances without subsidiary risk or articles containing such substances:
O1 Liquid;
O2 Solid;
O3 Articles;
OF Oxidizing substances, solid, flammable;
OS Oxidizing substances, solid, self-heating;
OW Oxidizing substances, solid which, in contact with water, emit flammable gases;
OT Oxidizing substances, toxic:
OT1 Liquid;
OT2 Solid;
OC Oxidizing substances, corrosive:
OC1 Liquid;
OC2 Solid;
OTC Oxidizing substances, toxic, corrosive.

Substances and articles classified in Class 5.1 are listed in Table A of Chapter 3.2. The assignment of
substances and articles not mentioned by name in Table A of Chapter 3.2 to the relevant entry of
2.2.51.3 in accordance with the provisions of Chapter 2.1 can be based on the tests, methods and
criteria in paragraphs 2.2.51.1.6-2.2.51.1.9 below and the Manual of Tests and Criteria, Part III,
Section 34.4. In the event of divergence between test results and known experience, judgement based
on known experience shall take precedence over test results.

If substances of Class 5.1, as a result of admixtures, come into different categories of risk from those
to which the substances mentioned by name in Table A of Chapter 3.2 belong, these mixtures or
solutions shall be assigned to the entries to which they belong on the basis of their actual degree of
danger.
NOTE: For the classification of solutions and mixtures (such as preparations and wastes), see also
Section 2.1.3.

On the basis of the test procedures in the Manual of Tests and Criteria, Part III, Section 34.4 and the
criteria set out in 2.2.51.1.6 to 2.2.51.1.9 it may also be determined whether the nature of a substance
mentioned by name in Table A of Chapter 3.2 is such that the substance is not subject to the
provisions for this class.

Oxidizing solids Classification

When oxidizing solid substances not mentioned by name in Table A of Chapter 3.2 are assigned to
one of the entries listed in 2.2.51.3 on the basis of the test procedure in accordance with the Manual of
Tests and Criteria, Part III, sub-section 34.4.1 (test O.1) or alternatively, sub section 34.4.3 (test O.3),
the following criteria shall apply:
(a) In the test O.1, a solid substance shall be assigned to Class 5.1 if, in the 4:1 or the 1:1 sampleto-
cellulose ratio (by mass) tested, it ignites or burns or exhibits mean burning times equal to or
less than that of a 3:7 mixture (by mass) of potassium bromate and cellulose; or
(b) In the test O.3, a solid substance shall be assigned to Class 5.1 if, in the 4:1 or the 1:1 sampleto-
cellulose ratio (by mass) tested, it exhibits a mean burning rate equal to or greater than the
mean burning rate of a 1:2 mixture (by mass) of calcium peroxide and cellulose.

Assignment of packing groups

Oxidizing solids classified under the various entries in Table A of Chapter 3.2 shall be assigned to
packing groups I, II or III on the basis of test procedures of the Manual of Tests and Criteria, Part III,
sub-section 34.4.1 (test O.1) or sub-section 34.4.3 (test O.3), in accordance with the following criteria:
(a) Test O.1:
(i) Packing group I: any substance which, in the 4:1 or 1:1 sample-to-cellulose ratio
(by mass) tested, exhibits a mean burning time less than the mean burning time of a
3:2 mixture, by mass, of potassium bromate and cellulose;
(ii) Packing group II: any substance which, in the 4:1 or 1:1 sample-to-cellulose ratio
(by mass) tested, exhibits a mean burning time equal to or less than the mean burning
time of a 2:3 mixture (by mass) of potassium bromate and cellulose and the criteria for
packing group I are not met;
(iii) Packing group III: any substance which, in the 4:1 or 1:1 sample-to-cellulose ratio
(by mass) tested, exhibits a mean burning time equal to or less than the mean burning
time of a 3:7 mixture (by mass) of potassium bromate and cellulose and the criteria for
packing groups I and II are not met;
(b) Test O.3:
(i) Packing group I: any substance which, in the 4:1 or 1:1 sample-to-cellulose ratio (by
mass) tested, exhibits a mean burning rate greater than the mean burning rate of a 3:1
mixture (by mass) of calcium peroxide and cellulose;
(ii) Packing group II: any substance which, in the 4:1 or 1:1 sample-to-cellulose ratio (by
mass) tested, exhibits a mean burning rate equal to or greater than the mean burning rate
of a 1:1 mixture (by mass) of calcium peroxide and cellulose, and the criteria for
packing group I are not met;
(iii) Packing group III: any substance which, in the 4:1 or 1:1 sample-to-cellulose ratio (by
mass) tested, exhibits a mean burning rate equal to or greater than the mean burning rate
of a 1:2 mixture (by mass) of calcium peroxide and cellulose, and the criteria for
packing groups I and II are not met.

Oxidizing liquids Classification

When oxidizing liquid substances not mentioned by name in Table A of Chapter 3.2 are assigned to
one of the entries listed in sub-section 2.2.51.3 on the basis of the test procedure in accordance with
the Manual of Tests and Criteria, Part III, sub-section 34.4.2, the following criteria shall apply:
 
A liquid substance shall be assigned to Class 5.1 if, in the 1:1 mixture, by mass, of substance and
cellulose tested, it exhibits a pressure rise of 2070 kPa gauge or more and a mean pressure rise time
equal to or less than the mean pressure rise time of a 1:1 mixture, by mass, of 65% aqueous nitric acid
and cellulose.
 

Assignment of packing groups

Oxidizing liquids classified under the various entries in Table A of Chapter 3.2 shall be assigned to
packing groups I, II or III on the basis of test procedures of the Manual of Tests and Criteria, Part III,
section 34.4.2, in accordance with the following criteria:
(a) Packing group I: any substance which, in the 1:1 mixture, by mass, of substance and cellulose
tested, spontaneously ignites; or the mean pressure rise time of a 1:1 mixture, by mass, of
substance and cellulose is less than that of a 1:1 mixture, by mass, of 50% perchloric acid and
cellulose;
(b) Packing group II: any substance which, in the 1:1 mixture, by mass, of substance and cellulose
tested, exhibits a mean pressure rise time less than or equal to the mean pressure rise time of
a 1:1 mixture, by mass, of 40% aqueous sodium chlorate solution and cellulose; and the criteria
for packing group I are not met;
(c) Packing group III: any substance which, in the 1:1 mixture, by mass, of substance and cellulose
tested, exhibits a mean pressure rise time less than or equal to the mean pressure rise time of
a 1:1 mixture, by mass, of 65% aqueous nitric acid and cellulose; and the criteria for packing
groups I and II are not met.

Substances not accepted for carriage

The chemically unstable substances of Class 5.1 shall not be accepted for carriage unless the
necessary steps have been taken to prevent their dangerous decomposition or polymerization during
carriage. To this end it shall in particular be ensured that receptacles and tanks do not contain any
material liable to promote these reactions.

The following substances and mixtures shall not be accepted for carriage:
- oxidizing solids, self-heating, assigned to UN No. 3100, oxidizing solids, water-reactive,
assigned to UN No. 3121 and oxidizing solids, flammable, assigned to UN No. 3137, unless
they meet the requirements for Class 1 (see also 2.1.3.7);
- hydrogen peroxide, not stabilized or hydrogen peroxide, aqueous solutions, not stabilized
containing more than 60% hydrogen peroxide;
- tetranitromethane not free from combustible impurities;
- perchloric acid solutions containing more than 72% (mass) acid, or mixtures of perchloric acid
with any liquid other than water;
- chloric acid solution containing more than 10% chloric acid or mixtures of chloric acid with
any liquid other than water;
- halogenated fluor compounds other than UN Nos. 1745 BROMINE PENTAFLUORIDE; 1746
BROMINE TRIFLUORIDE and 2495 IODINE PENTAFLUORIDE of Class 5.1 as well as
UN Nos. 1749 CHLORINE TRIFLUORIDE and 2548 CHLORINE PENTAFLUORIDE of
Class 2;
- ammonium chlorate and its aqueous solutions and mixtures of a chlorate with an ammonium
salt;
- ammonium chlorite and its aqueous solutions and mixtures of a chlorite with an ammonium
salt;
- mixtures of a hypochlorite with an ammonium salt;
- ammonium bromate and its aqueous solutions and mixtures of a bromate with an ammonium
salt;
- ammonium permanganate and its aqueous solutions and mixtures of a permanganate with an
ammonium salt;
- ammonium nitrate containing more than 0.2% combustible substances (including any organic
substance calculated as carbon) unless it is a constituent of a substance or article of Class 1;
- fertilizers having an ammonium nitrate content (in determining the ammonium nitrate content,
all nitrate ions for which a molecular equivalent of ammonium ions is present in the mixture
shall be calculated as ammonium nitrate) or a content in combustible substances exceeding the
values specified in special provision 307 except under the conditions applicable to Class 1;
- ammonium nitrite and its aqueous solutions and mixtures of an inorganic nitrite with an
ammonium salt;
- mixtures of potassium nitrate, sodium nitrite and an ammonium salt.

 

List of collective entries

Class 5.2 Organic peroxides

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