In addition to the four UN packagings specified in 173.3(c)(1) [1A2, 1B2, 1N2, 1H2] it is necessary to make certain the “salvage drum” has been tested and marked for Packing Group III or higher performance standards for liquids or solids and a leakproofness test of 20 kPa (3 psig) and that the “salvage drum” is compatible with the lading.