The substance is assigned to packing group II under UN No. 3342 but may also be assigned to packing group III in accordance with 2.4.3.2.3 and 2.4.3.3 of this regulation after the appropriate tests have been carried out, or may not be subject to the provisions of Class 4.2 at all in accordance with 2.4.3.2.3.2. In the latter case, the substance may have to be classified as environmentally hazardous according to the criteria of Class 9.