Schedule 4 rr 7, 9 Tests of packaging required to be tested in accordance with this schedule Packaging that is required to comply with the tests set out in this schedule must comply with the following tests when tested using the particular hazardous substance to be contained or another substance with similar physical characteristics including density, viscosity, and particle size: 1 The package must withstand the impact at any orientation of a drop of 0.5 m on to a hard surface without losing its ability to retain its contents. 2 In the case of a liquid substance, the package must be leakproof when the package is held with the opening at the lowest point for a period of 30 minutes. The above tests must be done with the closure mechanism fully closed and, in the case of vented packaging, the vent must be sealed.