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2.11.2.: Classification criteria

2.11.2.1. A substance or mixture shall be classified as a self-heating substance or mixture of this class, if in the tests performed in accordance with the test method given in the ►M4  UN RTDG ◄ , Manual of Tests and Criteria, Part III, sub-section 33.3.1.6:
(a) a positive result is obtained using a 25 mm cube sample at 140 °C;
(b) a positive result is obtained in a test using a 100 mm sample cube at 140 °C and a negative result is obtained in a test using a 100 mm cube sample at 120 °C and the substance or mixture is to be packed in packages with a volume of more than 3 m3;
(c) a positive result is obtained in a test using a 100 mm sample cube at 140 °C and a negative result is obtained in a test using a 100 mm cube sample at 100 °C and the substance or mixture is to be packed in packages with a volume of more than 450 litres;
(d) a positive result is obtained in a test using a 100 mm sample cube at 140 °C and a positive result is obtained in a test using a 100 mm cube sample at 100 °C.
2.11.2.2. A self-heating substance or mixture shall be classified in one of the two categories for this class if, in a test performed in accordance with test method N.4 in Part III, sub-section 33.3.1.6 of the ►M4  UN RTDG ◄ , Manual of Tests and Criteria, the result meets the criteria according to Table 2.11.1:


Table 2.11.1

Criteria for self-heating substances and mixtures

Category

Criteria

1

A positive result is obtained in a test using a 25 mm sample cube at 140 °C

2

(a)  a positive result is obtained in a test using a 100 mm sample cube at 140 °C and a negative result is obtained in a test using a 25 mm cube sample at 140 °C and the substance or mixture is to be packed in packages with a volume of more than 3 m3; or

(b)  a positive result is obtained in a test using a 100 mm sample cube at 140 °C and a negative result is obtained in a test using a 25 mm cube sample at 140 °C, a positive result is obtained in a test using a 100 mm cube sample at 120 °C and the substance or mixture is to be packed in packages with a volume of more than 450 litres; or

(c)  a positive result is obtained in a test using a 100 mm sample cube at 140 °C and a negative result is obtained in a test using a 25 mm cube sample at 140 °C and a positive result is obtained in a test using a 100 mm cube sample at 100 °C.

Note
The test shall be performed on the substance or mixture in its physical form as presented. If, for example, for the purposes of supply or transport, the same chemical is to be presented in a physical form different from that which was tested and which is considered likely to materially alter its performance in a classification test, the substance shall also be tested in the new form.
2.11.2.3. Substances and mixtures with a temperature of spontaneous combustion higher than 50 °C for a volume of 27 m3 shall not be classified as a self-heating substance or mixture.
2.11.2.4. Substances and mixtures with a spontaneous ignition temperature higher than 50 °C for a volume of 450 litres shall not be assigned to Category 1 of this class.