Descriptors | Fire extinguishers, Portable, Firefighting equipment, Marking, Service pressure, Unalloyed steels, Steels, Elongation, Tensile strength, Thickness, Welded joints, Pressure testing, Burst tests, Test pressure, Crushing tests, Mechanical testing, Gas cylinders, Safety devices, Components, Aluminium alloys, Plastics, Carbon dioxide, Test specimens, Testing conditions, Specimen preparation |