The storage, other than as part of another Part A process and other than in a tank for the time being forming part of a powered vehicle, of any of the substances listed below except where the total capacity of the tanks installed at the location in question in which the relevant substance may be stored is less than the figure specified below in relation to that substance;
| any one or more acrylates | 20 tonnes |
| acrylonitrile | 20 tonnes |
| anhydrous ammonia | 100 tonnes |
| anhydrous hydrogen fluoride | 1 tonne |
| toluene di-isocyanate | 20 tonnes |
| vinyl chloride monomer | 20 tonnes |