2.16.4.: Additional Classification Considerations The corrosion rate can be measured according to the test method of Part III sub-section 37.4 of the ►M4  UN RTDG ◄ , Manual of Tests and Criteria. The specimen to be used for the test shall be made of the following materials:
(a) for the purposes of testing steel, steel types
S235JR+CR (1.0037 resp.St 37-2),
S275J2G3+CR (1.0144 resp.St 44-3), ISO 3574 as amended, Unified Numbering System (UNS) G 10200, or SAE 1020;
(b) for the purposes of testing aluminium: non-clad types 7075-T6 or AZ5GU-T6.