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;
- 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
Class 2;
- ammonium chlorate and its aqueous solutions and mixtures of a chlorate with an ammonium
- ammonium chlorite and its aqueous solutions and mixtures of a chlorite with an ammonium
- mixtures of a hypochlorite with an ammonium salt;
- ammonium bromate and its aqueous solutions and mixtures of a bromate with an ammonium
- 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


The heading of Class 5.2 covers organic peroxides and formulations of organic peroxides.

The substances of Class 5.2 are subdivided as follows:
P1 Organic peroxides, not requiring temperature control;
P2 Organic peroxides, requiring temperature control.


Organic peroxides are organic substances which contain the bivalent -O-O- structure and may be
considered derivatives of hydrogen peroxide, where one or both of the hydrogen atoms have been
replaced by organic radicals.


Organic peroxides are liable to exothermic decomposition at normal or elevated temperatures. The
decomposition can be initiated by heat, contact with impurities (e.g. acids, heavy-metal compounds,
amines), friction or impact. The rate of decomposition increases with temperature and varies with the
organic peroxide formulation. Decomposition may result in the evolution of harmful, or flammable,
gases or vapours. For certain organic peroxides the temperature shall be controlled during carriage.
Some organic peroxides may decompose explosively, particularly if confined. This characteristic may
be modified by the addition of diluents or by the use of appropriate packagings. Many organic
peroxides burn vigorously. Contact of organic peroxides with the eyes is to be avoided. Some organic
peroxides will cause serious injury to the cornea, even after brief contact, or will be corrosive to the
NOTE: Test methods for determining the flammability of organic peroxides are set out in the Manual
of Tests and Criteria, Part III, sub-section 32.4. Because organic peroxides may react vigorously
when heated, it is recommended to determine their flash-point using small sample sizes such as
described in ISO 3679:1983.


Any organic peroxide shall be considered for classification in Class 5.2 unless the organic peroxide
formulation contains:
(a) Not more than 1.0% available oxygen from the organic peroxides when containing not more
than 1.0% hydrogen peroxide;
(b) Not more than 0.5% available oxygen from the organic peroxides when containing more than
1.0% but not more than 7.0% hydrogen peroxide.
NOTE: The available oxygen content (%) of an organic peroxide formulation is given by the formula

Organic peroxides are classified into seven types according to the degree of danger they present. The
types of organic peroxide range from type A, which is not accepted for carriage in the packaging in
which it is tested, to type G, which is not subject to the provisions of Class 5.2. The classification of
types B to F is directly related to the maximum quantity allowed in one package. The principles to be
applied to the classification of substances not listed in are set out in the Manual of Tests and
Criteria, Part II.

Organic peroxides which have already been classified and are already permitted for carriage in
packagings are listed in, those already permitted for carriage in IBCs are listed in,
packing instruction IBC520 and those already permitted for carriage in tanks in accordance with
Chapters 4.2 and 4.3 are listed in, portable tank instruction T23. Each permitted substance
listed is assigned to a generic entry of Table A of Chapter 3.2 (UN Nos. 3101 to 3120) and appropriate
subsidiary risks and remarks providing relevant transport information are given.
These generic entries specify:
- the type (B to F) of organic peroxide (see above);
- physical state (liquid/solid); and
- temperature control (when required), see to
Mixtures of these formulations may be classified as the same type of organic peroxide as that of the
most dangerous component and be carried under the conditions of carriage given for this type.
However, as two stable components can form a thermally less stable mixture, the self-accelerating
decomposition temperature (SADT) of the mixture shall be determined and, if necessary, the control
and emergency temperatures derived from the SADT in accordance with

Classification of organic peroxides not listed in, packing instruction IBC520 or, portable tank instruction T23, and assignment to a collective entry shall be made by the
competent authority of the country of origin. The statement of approval shall contain the classification
and the relevant conditions of carriage. If the country of origin is not a Contracting Party to ADR, the
classification and conditions of carriage shall be recognized by the competent authority of the first
country Contracting Party to ADR reached by the consignment.

Samples of organic peroxides or formulations of organic peroxides not listed in, for which a
complete set of test results is not available and which are to be carried for further testing or evaluation,
shall be assigned to one of the appropriate entries for organic peroxides type C provided the following
conditions are met:
- the available data indicate that the sample would be no more dangerous than organic peroxides
type B;
- the sample is packaged in accordance with packing method OP2 and the quantity per transport
unit is limited to 10 kg;
- the available data indicate that the control temperature, if any, is sufficiently low to prevent any
dangerous decomposition and sufficiently high to prevent any dangerous phase separation.
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