conditions
the relative densities of the filling substances shall not exceed that used to determine the height for the drop test performed successfully according to 6.1.5.3.5 or 6.5.6.9.4 and the mass for the stacking test performed successfully according to 6.1.5.6 or where necessary according to 6.5.6.6 with the assimilated standard liquid(s). the vapour pressures of the filling substances at 50 °c or 55 °c shall not exceed that used to determine the pressure for the internal pressure (hydraulic) test performed successfully according to 6.1.5.5.4 or 6.5.6.8.4.2 with the assimilated standard liquid(s). in case that filling substances are assimilated to a combination of standard liquids, the corresponding values of the filling substances shall not exceed the minimum values derived from the applied drop heights, stacking masses and internal test pressures.
example: un 1736 benzoyl chloride is assimilated to the combination of standard liquids "mixture of hydrocarbons and wetting solution". it has a vapour pressure of 0.34 kpa at 50 °c and a relative density of approximately 1.2. design type tests for plastics drums and jerricans were frequently performed at minimum required test levels. in practice this means that the stacking test is commonly performed with stacking loads considering only a relative density of 1.0 for the "mixture of hydrocarbons" and a relative density of 1.2 for the "wetting solution" (see definition of standard liquids in 6.1.6). as a consequence chemical compatibility of such tested design types would not be verified for benzoyl chloride by reason of the inadequate test level of the design type with the standard liquid "mixture of hydrocarbons". (due to the fact that in the majority of cases the applied internal hydraulic test pressure is not less than 100 kpa, the vapour pressure of benzoyl chloride would be covered by such test level according to 4.1.1.10).
all components of a filling substance, which may be a solution, mixture or preparation, such as wetting agents in detergents and disinfectants, irrespective whether dangerous or non-dangerous, shall be included in the assimilation procedure.