This European Standard specifies the minimum requirements, test methods, marking and information supplied by the manufacturer for the following ventilated and non-ventilated gas-tight chemical protective suits. It describes personal protective ensembles to be worn during hazardous materials responses involving liquid, gaseous and particulate hazards only. This standard does not establish minimum criteria for protection for non chemical hazards, e. g. radiological, fire, heat, explosive. This type of equipment is not intended for total immersion in liquids. The seams, joins and assemblages attaching the accessories are included within the scope of this standard. The basic performance criteria for the accessories: gloves, boots or respiratory protective equipment are given in other European Standards.