Ama-vials wesitoreji esiyisibonelo, esaziwa nangokuthi amabhodlela okugcina amakhemikhali, amabhodlela okufaka amakhemikhali, alungele ukufakwa okuphansi kwemikhakha ehlukahlukene yezemithi, amakhemikhali angezwe aphezulu, amalungiselelo okugcina impahla, alungele ukugcinwa okuhle kakhulu kwemikhiqizo.