Corrigendum - REACH24H Consulting Group

CHAPTER 2.5
CLASS 5 - OXIDIZING SUBSTANCES
AND ORGANIC PEROXIDES
Introductory note
NOTE: Because of the different properties exhibited by dangerous goods within Divisions 5.1 and 5.2, it
is impracticable to establish a single criterion for classification in either division. Tests and criteria for
assignment to the two divisions of Class 5 are addressed in this Chapter.
2.5.1 Definitions and general provisions
Class 5 is divided into two divisions as follows:
(a) Division 5.1 Oxidizing substances
Substances which, while in themselves not necessarily combustible, may, generally by
yielding oxygen, cause, or contribute to, the combustion of other material. Such substances
may be contained in an article;
(b) Division 5.2 Organic peroxides
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derivatives of hydrogen peroxide, where one or both of the hydrogen atoms have been
replaced by organic radicals.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 thermally unstable substances, which
may undergo exothermic self-accelerating decomposition. In addition, they may have one
or more of the following properties:
(i) be liable to explosive decomposition;
(ii) burn rapidly;
(iii) be sensitive to impact or friction;
(iv) react dangerously with other substances;
(v) cause damage to the eyes.
2.5.2 Division 5.1 - Oxidizing substances
2.5.2.1 Classification in Division 5.1
Copyright@United Nations, 2011. All rights reserved.
2.5.2.1.1 Oxidizing substances are classified in Division 5.1 in accordance with the test methods,
procedures and criteria in 2.5.2.2, 2.5.2.3 and the Manual of Tests and Criteria, Part III, section 34. In the event of
divergence between test results and known experience, judgement based on known experience shall take
precedence over test results.
NOTE: Where substances of this Division are listed in the Dangerous Goods List in Chapter 3.2,
reclassification of those substances in accordance with this criteria shall be undertaken only when this is
necessary for safety.
2.5.2.1.2 For substances having other risks, e.g. toxicity or corrosivity, the requirements of Chapter 2.0
shall be met.
- 97 -