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2.13.4.: Additional Classification Considerations

2.13.4.1. For organic substances or mixtures the classification procedure for this class shall not apply if:
(a) the substance or mixture does not contain oxygen, fluorine or chlorine; or
(b) the substance or mixture contains oxygen, fluorine or chlorine and these elements are chemically bonded only to carbon or hydrogen.
2.13.4.2. For inorganic substances or mixtures the classification procedure for this class shall not apply if they do not contain oxygen or halogen atoms.
2.13.4.3. In the event of divergence between test results and known experience in the handling and use of substances or mixtures which shows them to be oxidising, judgments based on known experience shall take precedence over test results.
2.13.4.4. In cases where substances or mixtures generate a pressure rise (too high or too low), caused by chemical reactions not characterising the oxidising properties of the substance or mixture, the test described in Part III, sub-section 34.4.2 of the ►M4  UN RTDG ◄ , Manual of Tests and Criteria shall be repeated with an inert substance, e.g. diatomite (kieselguhr), in place of the cellulose in order to clarify the nature of the reaction and to check for a false positive result.